commit 627832187378e171ec3c2d077ac00cb01a33bb80
Author: Niko Marmeladkov <niko@n1ko.dev>
Date:   Sat Aug 22 23:20:41 2026 +0300

    niko_trust_gui: TCE protocol client with iced GUI
    
    - Byte-exact TCE codec (encoder/decoder, canonical numbers, vectors-tested)
    - Ed25519 identities with bech32m trust1… addresses
    - Relay client: challenge/auth handshake, request feed, responses,
      transparent re-auth on 401
    - iced GUI (Material-dark, Solana-style palette): tab shell, approval
      prompts with native toasts on Linux, address book, history, settings,
      password change
    - Portable single-file vault (identity + book + history + settings)
    - Live 2FA roundtrip examples (send_2fa, await_2fa)

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e269752
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..aa3422d
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,56 @@
+[package]
+name = "niko_trust_gui"
+version = "0.1.0"
+edition = "2021"
+description = "Niko Trust GUI client (trust.n1ko.dev)"
+license = "MIT"
+
+[features]
+default = ["gui"]
+# "gui" builds the iced desktop app. Disable (--no-default-features) for a fast
+# core-only build that skips the heavy GUI dependency tree.
+gui = ["dep:iced"]
+
+[dependencies]
+# crypto
+sha2 = "0.11"
+ed25519-dalek = { version = "3.0", default-features = true }
+curve25519-dalek = "5.0"
+chacha20poly1305 = "0.11"
+aead = "0.6"
+argon2 = "0.5"
+subtle = "2"
+zeroize = { version = "1", features = ["zeroize_derive"] }
+getrandom = "0.4"
+
+# codecs / io
+bech32 = "0.12"
+hex = "0.4"
+base64 = "0.23"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+dirs = "6"
+ureq = { version = "3.4", default-features = true, features = ["json"] }
+
+# GUI (cross-platform)
+# "tokio" gives iced::time::every (the default thread-pool backend has an empty
+# time module), so the poll loop has a real timer.
+iced = { version = "0.14", optional = true, features = ["tokio"] }
+
+# autostart (cross-platform: XDG autostart / Windows registry)
+auto-launch = "0.6"
+
+[target.'cfg(target_os = "linux")'.dependencies]
+notify-rust = "4.18"
+
+[target.'cfg(target_os = "windows")'.dependencies]
+winrt-notification = "0.5"
+windows = "0.62"
+
+[dev-dependencies]
+# nothing yet
+
+[profile.release]
+lto = "thin"
+strip = true
+codegen-units = 1
\ No newline at end of file
diff --git a/OPENCODE.md b/OPENCODE.md
new file mode 100644
index 0000000..5c53bc8
--- /dev/null
+++ b/OPENCODE.md
@@ -0,0 +1,191 @@
+# OPENCODE — контекст проекта Niko Trust GUI
+
+Этот файл — постоянная память контекста. Обновлять при каждом значимом решении/изменении,
+чтобы не терять суть между сессиями.
+
+## Что это
+
+**Niko Trust GUI** — лёгкий GUI-клиент (Rust, **iced**) к trust-релею
+(`~/niko_trust`, Go, `git.n1ko.dev/Niko/niko_trust`). Один бинарник, Linux + Windows.
+Для людей, которые не разбираются в криптографии.
+
+**Product-флоу (история юзера):**
+1. Юзер запускает GUI.
+2. Первый запуск: создание identity (ed25519), установка пароля, согласие на автозагрузку.
+3. Юзер копирует свой адрес (`trust1q...`) и вставляет его в нужную программу/сервис
+   (например, на свою почту как 2FA).
+4. При входе в сервис сервис создаёт `ApprovalRequest` на этот адрес.
+5. GUI периодически опрашивает релей и при новом запросе шлёт **нативную нотификацию
+   с кнопками Approve/Deny**.
+6. Юзер жмёт кнопку → GUI подписывает `ApprovalResponse` и кладёт его в релей.
+7. Сервис видит ответ (`GET /v1/responses?request=<id>`) и пускает/не пускает юзера.
+
+## Ключевые пути/ресурсы
+
+| Что | Где |
+|---|---|
+| GUI-репо (этот) | `/home/niko/niko_trust_gui` |
+| Сервер-репо (Go) | `/home/niko/niko_trust` |
+| Протокол (нормативный) | `~/niko_trust/docs/PROTOCOL.md` |
+| HTTP API | `~/niko_trust/docs/API.md` |
+| Trust-модель | `~/niko_trust/docs/TRUST-MODEL.md` |
+| Адреса | `~/niko_trust/docs/ADDRESS.md` |
+| Frozen test vectors (эталон) | `~/niko_trust/testdata/vectors/tce_vectors.json` |
+| Go-эталон кодирования | `~/niko_trust/internal/protocol/encode.go`, `internal/tce/encoder.go` |
+
+## Серверы
+
+- **Production:** `https://trust.n1ko.dev`
+- **Тест сейчас:** `http://192.168.31.155:5743` — значение по умолчанию в конфиге GUI.
+  Настройка переключает на production-пресет.
+- **`audience` для подписей не хардкодим** — берём из `GET /v1/config` (`{"audience":"..."}`).
+- Инструкция юзера: **если найден баг в сервере — остановиться и сообщить.**
+
+## Ключевые решения и почему
+
+1. **GUI = iced** (выбрано юзером, а не egui). Elm-style async (Subscription),
+   нативный вид, хорошо для poll-потока. Минус: больше кода.
+2. **Seed хранится зашифрованным паролем**: `argon2id` (KDF) →
+   `XChaCha20-Poly1305` (AEAD), файл `0600`. Юзер вводит пароль при каждом запуске.
+   Безопасность важна: seed подписывает Approval.
+3. **Windows-уведомления с кнопками** через `winrt-notification`;
+   **fallback** (если COM/регистрация нестабильны) — toast без кнопок + попап
+   в приложении с Approve/Deny. Linux — `notify-rust` (libnotify), кнопки из коробки.
+4. **HTTP = `ureq` + rustls** — лёгкий, без openssl, один бинарник, blocking в фоновом
+   потоке под iced `Subscription`.
+5. **Верификация подписей — на клиенте.** `PUT /v1/objects` НЕ проверяет подписи
+   (INV-5: релей отвечает "кто сказал", не "верить ли"). Значит GUI обязан:
+   строго декодировать, валидировать pubkey, проверить ed25519 по встроенному в TCE ключу,
+   применить правила объекта (скев ±120 с, lifetime запроса ≤60 с).
+6. **TCE — byte-exact.** Ноль нормализации строк, canonical uvarint, сортировка карт по
+   сырым байтам, decimal-числа без float. Проверка — сверка с frozen vectors.
+7. **Только клиент держит приватный ключ** (server никогда не импортит signer; INV-1).
+   У нас то же правило: no server-side signing.
+
+## Rust-эквиваленты Go
+
+| Go | Rust |
+|---|---|
+| `crypto/ed25519` (RFC8032, детерм.) | `ed25519-dalek` |
+| `filippo.io/edwards25519` (ValidatePubKey) | `curve25519-dalek` |
+| `btcutil/bech32` (bech32m) | crate `bech32` (Bech32m) |
+| `crypto/sha256` (object_id) | `sha2` |
+| `crypto/rand` (nonce/seed) | `rand` + `getrandom` |
+| argon2id + XChaCha20-Poly1305 | crates `argon2`, `chacha20poly1305` |
+| HTTP | `ureq` (rustls) |
+
+## Wire-протокол (сводка, детали в PROTOCOL.md)
+
+- Magic 21 байт `trust.n1ko.dev/tce/1\0`, затем object_tag (1 байт), version uvarint (=1).
+- Теги: 0x01 Identity, 0x02 Claim, 0x03 Revocation, 0x04 ApprovalRequest,
+  0x05 ApprovalResponse, 0x06 AuthAssertion.
+- `object_id = hex(sha256(tce))`. Подпись = Ed25519 над точными TCE-байтами (не над JSON).
+- Identity-поле: `uvarint(address_version=0) || uvarint(32) || pubkey(32)` → `00 20 <32>`.
+- Строки: `uvarint(len) || utf8`, без контроля, без нормализации, без BOM.
+- uvarint canonical (без `81 00`). Таймстампы: uvarint, диапазон 1e9..4102444800,
+  `0` разрешён только как "no expiry".
+- Значения: 0x00 null, 0x01 false, 0x02 true, 0x03 string, 0x04 number(canonical decimal text).
+- Карты: `uvarint(count) || (enc_bytes(key)||value)*`, ключи по `[a-z][a-z0-9]*([._-][a-z0-9]+)*`,
+  сортировка bytewise ascending, дубли запрещены.
+- Адрес: bech32m, hrp `trust`, payload = `0x00||pubkey33`, строгий decode (lowercase, no pad bits).
+- Полные лимиты полей и объектов — PROTOCOL.md §6.3 (зашиты в encoder/decoder).
+
+### Поля объектов (строгий порядок!)
+- **IdentityRegistration (0x01):** identity, alias(≤64), created_at
+- **Claim (0x02):** issuer, subject, claims(map≥1), created_at, expires_at(0=noexp), serial, nonce(16)
+- **Revocation (0x03):** issuer, claim_id(32), reason(≤256), created_at, nonce(16)
+- **ApprovalRequest (0x04):** sender, recipient, action(≤128), payload(map,может быть пустой),
+  message(≤256), created_at, expires_at(≤ created_at+60s!), nonce(16)
+- **ApprovalResponse (0x05):** request_hash(32), responder, decision(uvarint 0|1), created_at, nonce(16)
+- **AuthAssertion (0x06):** identity, challenge(32), scope(≤32), audience(≤128), created_at
+
+### API-эндпоинты (детали API.md)
+- `POST /v1/auth/challenge` → `{"challenge":"<hex>"}` (rate 30/мин/IP)
+- `POST /v1/auth/assert` (Envelope AuthAssertion) → `{"session_token","identity","scope"}`
+- `POST /v1/objects` (Envelope) → `{"object_id"}`; idempotent; 1 response/request (422 иначе)
+- `GET /v1/objects/{id}`, `GET /v1/claims?subject=`, `GET /v1/requests?recipient=`,
+  `GET /v1/responses?request=`, `GET /v1/revocations?claim=` + `limit`/`offset`
+- Read-эндпоинты: `Authorization: Bearer <token>` или `?token=`; сессия 30 мин.
+- Scope для чтения всего: `"read"` или `"*"` (или точный `read:requests` и т.д.); 401/403.
+- `GET /v1/config` (audience), `/v1/healthz`, `/v1/readyz`, `/v1/metrics`.
+
+### Auth-поток клиента
+1. `GET /v1/config` → audience.
+2. `POST /v1/auth/challenge` → 32-байт challenge (hex).
+3. Собрать `AuthAssertion{identity=mypub, challenge, scope:"*", audience, created_at=now}`.
+4. Подписать TCE, `POST /v1/auth/assert` с Envelope `{tce, signature}` → `session_token`.
+5. Дальше read-эндпоинты с Bearer. Сессия живёт 30 мин; при 401 → пере-auth.
+
+### Ответ на запрос
+1. GET `/v1/requests?recipient=<мой адрес>&limit=N`. Каждый item = Envelope `{tce, signature}` + object view.
+2. Строго декодировать ApprovalRequest из `tce`; извлечь sender, action, message, nonce, created_at, expires_at;
+   вычислить request_hash = sha256(tce).
+3. Проверить подпись: address.ValidatePubKey(sender) + ed25519.Verify(sender, tce, signature).
+4. Проверить время: now ∈ [created_at−120s, expires_at+120s].
+5. Показать: message + sender-address + действие. NOT как endorsement от релея.
+6. Approve → `ApprovalResponse{request_hash, responder=mypub, decision=1, created_at=now, nonce=rand16}`
+   → подписать → `POST /v1/objects`. Deny → decision=0.
+7. Один ответ на запрос — сервер отклонит второй (422).
+
+## Тестовые векторы (эталон)
+
+- Партии: NikoCraft seed=`01`×32, Niko seed=`02`×32 (указы в vectors: pubkey, address).
+- Проверки: encoder даёт тот же hex; object_id совпадает; dalek verify подписи ok;
+  decoder→re-encode тождество; адреса совпадают; таблица canonical numbers;
+  выборочные rejects на decoder.
+
+## Статус
+
+- [x] Изучен сервер-репо, протокол, API, векторы (source review + read-only smoke GET:
+      healthz/readyz/config ok, claims без токена → честный 401). Видимых багов сервера нет.
+- [x] OPENCODE.md создан.
+- [x] Скаффолд Cargo (feature `gui` = iced; `cargo test --no-default-features` = быстрое ядро без iced).
+- [x] tce (encoder/decoder/number) + address (свой bech32m) + signer (ed25519-dalek 3, is_weak+verify_strict)
+      + protocol (6 объектов). **Все frozen vectors byte-exact: encode→hex, object_id, подпись (dalek
+      воспроизводит детерменированные подписи), decode→re-encode, reject-набор, числа, адреса.** clippy чист.
+- [x] keyring (argon2id + XChaCha20-Poly1305, файл 0600). **Готово**: `src/keyring.rs`,
+      `FileFormat{v,kdf,m,t,p,salt,nonce,cipher}` (base64), `aead` добавлен в deps (0.6),
+      `XNonce::from`, 5 unit-тестов (roundtrip, wrong-password, kdf-params), clippy чист.
+- [x] relay + live-тест. **Готово**: `src/relay.rs` + `tests/live_relay.rs` (env `NIKO_RELAY`).
+      Auth-рукопожатие (config→audience, challenge, AuthAssertion{scope:"*"}, assert→Bearer),
+      `fetch_requests` (строгая декодировка + validate_pubkey + verify + recipient must = me,
+      пропускает ядовитые конверты), `respond` (проверка окна запроса ±120с, request_hash=sha256(tce),
+      POST objects), `store`. **3 live-теста против `192.168.31.155:5743` проходят:**
+      roundtrip (ответ принят, 2-й ответ на тот же запрос → 422), wrong-recipient отфильтрован,
+      forged-подпись отброшена. ВАЖНО: у ureq 3.4 API другой (http::Response<Body> +
+      body_mut().read_json()/read_to_string(), `http_status_as_error(false)` в конфиге агента).
+- [x] inbox/verify. **Готово**: `src/inbox.rs` — `Inbox` (в памяти): dedup по request_id
+      (каждый запрос всплывает один раз), история `HistoryItem{request_id_hex, sender(Address),
+      action, message, created_at, expires_at, outcome}`, `in_window(created,expires,now)` с
+      ±120s skew (§13.1), outcome Pending/Approved/Denied/TimedOut/Stale. `observe()` возвращает
+      только actionable (`Pending`); истёкшие/из будущего записываются в историю как TimedOut/Stale.
+      `Address` получил `PartialEq, Eq`. 3 unit-теста (dedup, window+outcomes, outcome_changes).
+- [x] notify + autostart. **Готово**: `src/notify.rs` — `ApprovalNotification{sender,action,message}`,
+      `show()` (notify-rust, кнопки Approve/Deny, ждёт через отдельный поток), `PromptHandle::wait_timeout`,
+      `PromptOutcome{Approved,Denied,Ignored}`, `to_decision()`, `interactive_supported()` = `dbus_stack().is_some()`.
+      `src/autostart.rs` — обёртка `auto-launch` (XDG autostart на Linux, registry на Windows), `APP_NAME="niko-trust"`,
+      `enable/disable/is_enabled`. Smoke-тест `examples/smoke.rs` отработал на этой машине: dbus есть,
+      уведомление показывается (кнопки кликнуть некому — демона нет, outcome=Ignored после таймаута), autostart is_enabled=false.
+      Модули `notify`/`autostart` вне feature-gate `gui` (не зависят от iced).
+- [x] UI iced (последний блок). **Готово**: `src/main.rs` (модуль `gui`, feature `gui`; вне gui — стаб
+      `main` с ошибкой). Сборка: iced 0.14 + фича `tokio` (default-бэкенд `thread-pool` имеет пустой
+      `time`, без tokio/smol нет `iced::time::every`). Экраны: lock (первый запуск = создание
+      identity, иначе разблокировка; поле relay URL, default `https://trust.n1ko.dev`) и main
+      (заголовок с адресом/релеем, статус-строка, карточка запроса с Approve/Deny, история).
+      Poll-loop: `Subscription` `time::every(5s)` → `Relay::fetch_requests` → `Inbox::observe` →
+      очередь (`VecDeque`) → текущий `Prompt`. Нативные нотификации: `notify::show` в отдельном
+      потоке, outcome в UI через `futures::channel::mpsc` + глобальный слот `PROMPT_RX` +
+      `Subscription::run_with(request_id, |_| iced::stream::channel(...))` (инфраструктура
+      `iced::stream`/`futures` реэкспортируется iced'ом). Ответ: `Relay::respond` в `Task::perform`,
+      при истечении окна (проверка `in_window`) помечается TimedOut. **Изменено в ядре**: в
+      `IncomingRequest` добавлено поле `tce: Vec<u8>` (точные байты запроса нужны для request_hash
+      при ответе; re-encode не byte-exact). Проверено: `cargo build`+`clippy --all-targets` чистые
+      (и с gui, и `--no-default-features`), 10 lib + 3 tce + 3 live тестов зелёные, **live-тесты
+      прогнаны против production `NIKO_RELAY=https://trust.n1ko.dev` — проходят**, GUI запускается
+      (без падений, первый запуск = экран создания).
+
+## Команды
+
+- `cargo build` / `cargo test` / `cargo clippy` в `/home/niko/niko_trust_gui`.
+- Live-интеграционные тесты: env `NIKO_RELAY=https://trust.n1ko.dev` (или `http://192.168.31.155:5743`).
+- Windows: target `x86_64-pc-windows-gnu` установлен; кросс-сборка отдельно.
\ No newline at end of file
diff --git a/examples/await_2fa.rs b/examples/await_2fa.rs
new file mode 100644
index 0000000..4e76206
--- /dev/null
+++ b/examples/await_2fa.rs
@@ -0,0 +1,103 @@
+//! Full 2FA service flow: post an approval request, then poll for the user's
+//! decision until the request window lapses.
+//!
+//! Usage:
+//!   cargo run --example await_2fa -- [relay] <recipient-address> [action] [message]
+//!
+//! Exit code: 0 = approved, 4 = denied, 5 = timeout.
+
+use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};
+
+use niko_trust_gui::address::Address;
+use niko_trust_gui::protocol::{encode_approval_request, ApprovalRequest};
+use niko_trust_gui::relay::{object_hash, request_id_hex, Relay};
+use niko_trust_gui::signer::Signer;
+use niko_trust_gui::tce::{MAX_APPROVAL_LIFETIME, NONCE_SIZE};
+
+fn main() {
+    let mut args = std::env::args().skip(1);
+    let first = args.next().unwrap_or_default();
+    let (base, addr_s) = if first.starts_with("trust1") {
+        ("https://trust.n1ko.dev".to_string(), first)
+    } else {
+        let a = args.next().unwrap_or_else(|| {
+            eprintln!("usage: await_2fa [relay] <recipient-address> [action] [message]");
+            std::process::exit(2);
+        });
+        (first.trim_end_matches('/').to_string(), a)
+    };
+    let action = args.next().unwrap_or_else(|| "2fa".to_string());
+    let message = args
+        .next()
+        .unwrap_or_else(|| "Confirm sign-in (2FA)".to_string());
+
+    let recipient = Address::parse(&addr_s).expect("invalid recipient address");
+    let sender = Signer::generate().expect("generate sender key");
+
+    let created = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .expect("clock")
+        .as_secs();
+    let mut nonce = [0u8; NONCE_SIZE];
+    getrandom::fill(&mut nonce).expect("rng");
+
+    let req = ApprovalRequest {
+        sender: sender.pubkey(),
+        recipient: *recipient.pubkey(),
+        action,
+        payload: Default::default(),
+        message,
+        created_at: created,
+        expires_at: created + MAX_APPROVAL_LIFETIME,
+        nonce,
+    };
+    let tce = encode_approval_request(&req).expect("encode request");
+    let sig = sender.sign(&tce);
+    let req_hash = object_hash(&tce);
+
+    // The "service" authenticates and stores the request.
+    let agent = Relay::auth(&base, &sender, "*").expect("sender auth");
+    let id = agent.store(&tce, &sig).expect("store request");
+    println!(
+        "request {} stored (id {}), waiting up to {MAX_APPROVAL_LIFETIME}s for a decision…",
+        req.action, id
+    );
+
+    // Poll for the response until the window lapses.
+    let rid = request_id_hex(&tce);
+    let deadline = Instant::now() + Duration::from_secs(MAX_APPROVAL_LIFETIME + 15);
+    while Instant::now() < deadline {
+        std::thread::sleep(Duration::from_secs(2));
+        let responses = match agent.fetch_responses(&rid) {
+            Ok(r) => r,
+            Err(e) => {
+                eprintln!("poll error: {e}");
+                continue;
+            }
+        };
+        for inc in responses {
+            if inc.response.request_hash != req_hash {
+                continue; // answer to some other request
+            }
+            if inc.response.responder != *recipient.pubkey() {
+                eprintln!(
+                    "warning: response from {}, expected {}",
+                    inc.responder, recipient
+                );
+                continue;
+            }
+            match inc.response.decision {
+                niko_trust_gui::protocol::Decision::Allow => {
+                    println!("DECISION: APPROVED by {}", inc.responder);
+                    std::process::exit(0);
+                }
+                niko_trust_gui::protocol::Decision::Deny => {
+                    println!("DECISION: DENIED by {}", inc.responder);
+                    std::process::exit(4);
+                }
+            }
+        }
+    }
+    println!("DECISION: TIMEOUT (no answer within the request window)");
+    std::process::exit(5);
+}
diff --git a/examples/send_2fa.rs b/examples/send_2fa.rs
new file mode 100644
index 0000000..fd099a8
--- /dev/null
+++ b/examples/send_2fa.rs
@@ -0,0 +1,59 @@
+//! Send a live approval request ("2FA authentication") to a recipient.
+//!
+//! Usage:
+//!   cargo run --example send_2fa -- [relay] <recipient-address> [action] [message]
+//!
+//! Defaults: relay = https://trust.n1ko.dev, action = "2fa".
+
+use niko_trust_gui::address::Address;
+use niko_trust_gui::protocol::{encode_approval_request, ApprovalRequest};
+use niko_trust_gui::relay::Relay;
+use niko_trust_gui::signer::Signer;
+use niko_trust_gui::tce::NONCE_SIZE;
+
+fn main() {
+    let mut args = std::env::args().skip(1);
+    let first = args.next().unwrap_or_default();
+    let (base, addr_s) = if first.starts_with("trust1") {
+        ("https://trust.n1ko.dev".to_string(), first)
+    } else {
+        let a = args.next().unwrap_or_else(|| {
+            eprintln!("usage: send_2fa [relay] <recipient-address> [action] [message]");
+            std::process::exit(2);
+        });
+        (first.trim_end_matches('/').to_string(), a)
+    };
+    let action = args.next().unwrap_or_else(|| "2fa".to_string());
+    let message = args
+        .next()
+        .unwrap_or_else(|| "Confirm sign-in (2FA)".to_string());
+
+    let recipient = Address::parse(&addr_s).expect("invalid recipient address");
+
+    let sender = Signer::generate().expect("generate sender key");
+    let created = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .expect("clock")
+        .as_secs();
+
+    let mut nonce = [0u8; NONCE_SIZE];
+    getrandom::fill(&mut nonce).expect("rng");
+
+    let req = ApprovalRequest {
+        sender: sender.pubkey(),
+        recipient: *recipient.pubkey(),
+        action,
+        payload: Default::default(),
+        message,
+        created_at: created,
+        expires_at: created + niko_trust_gui::tce::MAX_APPROVAL_LIFETIME,
+        nonce,
+    };
+    let tce = encode_approval_request(&req).expect("encode request");
+    let sig = sender.sign(&tce);
+
+    let agent = Relay::auth(&base, &sender, "*").expect("sender auth");
+    let id = agent.store(&tce, &sig).expect("store request");
+    println!("request stored: object id {}", id);
+    println!("recipient: {}", recipient);
+}
diff --git a/examples/smoke.rs b/examples/smoke.rs
new file mode 100644
index 0000000..e0aeb74
--- /dev/null
+++ b/examples/smoke.rs
@@ -0,0 +1,32 @@
+use std::time::Duration;
+
+use niko_trust_gui::autostart::Autostart;
+use niko_trust_gui::notify::{show, ApprovalNotification};
+
+fn main() {
+    println!("interactive_supported = {}", niko_trust_gui::notify::interactive_supported());
+
+    let handle = show(ApprovalNotification {
+        sender: "trust1qz9g...jya75".to_string(),
+        action: "login".to_string(),
+        message: "Approve 2FA login to mail.example.com".to_string(),
+    });
+    let outcome = handle.wait_timeout(Duration::from_secs(5));
+    println!("outcome = {outcome:?}");
+
+    let exe = std::env::current_exe().unwrap();
+    match Autostart::new(&exe) {
+        Ok(a) => {
+            println!(
+                "autostart app={} path={:?}",
+                niko_trust_gui::autostart::APP_NAME,
+                exe
+            );
+            match a.is_enabled() {
+                Ok(enabled) => println!("is_enabled = {enabled}"),
+                Err(e) => println!("is_enabled error: {e}"),
+            }
+        }
+        Err(e) => println!("autostart build failed: {e}"),
+    }
+}
\ No newline at end of file
diff --git a/src/address.rs b/src/address.rs
new file mode 100644
index 0000000..0e142e8
--- /dev/null
+++ b/src/address.rs
@@ -0,0 +1,311 @@
+//! Trust addresses: bech32m encoding of an Ed25519 public key plus a protocol
+//! version byte.
+//!
+//! hrp = "trust"; payload = version(1) || pubkey(32). bech32m (BIP-350) is used
+//! and checked for, so a bech32-checksum downgrade is rejected. Every valid
+//! address decodes to exactly one key and vice versa; public keys are
+//! validated as canonical prime-order curve points (see [validate_pubkey]).
+
+// The parallel to the Go implementation is exact except that bech32m is
+// implemented here directly (~90 lines) rather than via a dependency, which
+// keeps the parser fully under our control and unambiguous.
+
+use ed25519_dalek::VerifyingKey;
+
+const HRP: &str = "trust";
+const VERSION0: u8 = 0x00;
+const PUBKEY_SIZE: usize = 32;
+const PAYLOAD_SIZE: usize = 1 + PUBKEY_SIZE;
+
+const CHARSET: &[u8; 32] = b"qpzry9x8gf2tvdw0s3jn54khce6mua7l";
+const BECH32M_CONST: u32 = 0x2bc8_30a3;
+const BECH32_CONST: u32 = 1;
+
+/// Exact canonical encoded length of a version-0 trust address (65 chars).
+pub const ENCODED_LEN: usize = 5 + 1 + 53 + 6;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum AddressError {
+    /// Empty input.
+    Empty,
+    /// Input is longer than any address can be.
+    TooLong,
+    /// Input contains uppercase characters.
+    NotLowercase,
+    /// Bad checksum or malformed data.
+    Checksum,
+    /// Valid checksum but the bech32 (not bech32m) constant.
+    NotBech32m,
+    /// Human-readable part is not "trust".
+    WrongHrp,
+    /// Decoded payload is not version || 32-byte key.
+    PayloadSize,
+    /// Unknown protocol version byte.
+    Version,
+    /// Non-zero padding bits (a second spelling of an address).
+    Padding,
+    /// Public key is not 32 bytes.
+    KeySize,
+    /// Public key is not a valid curve point.
+    KeyNotOnCurve,
+    /// Public key encoding is non-canonical.
+    KeyNonCanonical,
+    /// Public key has small order.
+    KeySmallOrder,
+}
+
+impl std::fmt::Display for AddressError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let s = match self {
+            AddressError::Empty => "address: empty",
+            AddressError::TooLong => "address: too long",
+            AddressError::NotLowercase => "address: must be lowercase",
+            AddressError::Checksum => "address: invalid checksum",
+            AddressError::NotBech32m => "address: not bech32m",
+            AddressError::WrongHrp => "address: wrong human-readable part",
+            AddressError::PayloadSize => "address: wrong payload size",
+            AddressError::Version => "address: unsupported version",
+            AddressError::Padding => "address: non-canonical padding",
+            AddressError::KeySize => "address: public key must be 32 bytes",
+            AddressError::KeyNotOnCurve => "address: public key is not a valid curve point",
+            AddressError::KeyNonCanonical => "address: public key encoding is non-canonical",
+            AddressError::KeySmallOrder => "address: public key has small order",
+        };
+        f.write_str(s)
+    }
+}
+
+impl std::error::Error for AddressError {}
+
+/// Returns the byte index of `c` in the bech32 charset, if any.
+fn charset_pos(c: u8) -> Option<u8> {
+    CHARSET.iter().position(|&x| x == c).map(|i| i as u8)
+}
+
+fn polymod(values: &[u8]) -> u32 {
+    let gen = [0x3b6a_57b2u32, 0x2650_8e6d, 0x1ea1_19fa, 0x3d42_33dd, 0x2a14_62b3];
+    let mut chk: u32 = 1;
+    for &v in values {
+        let b = chk >> 25;
+        chk = ((chk & 0x1ff_ffff) << 5) ^ (v as u32);
+        for (i, &g) in gen.iter().enumerate() {
+            if (b >> i) & 1 == 1 {
+                chk ^= g;
+            }
+        }
+    }
+    chk
+}
+
+fn hrp_expand(hrp: &str) -> Vec<u8> {
+    let mut out = Vec::with_capacity(hrp.len() * 2 + 1);
+    for &c in hrp.as_bytes() {
+        out.push(c >> 5);
+    }
+    out.push(0);
+    for &c in hrp.as_bytes() {
+        out.push(c & 31);
+    }
+    out
+}
+
+fn create_checksum(hrp: &str, data: &[u8]) -> [u8; 6] {
+    let mut values = hrp_expand(hrp);
+    values.extend_from_slice(data);
+    values.extend_from_slice(&[0; 6]);
+    let pm = polymod(&values) ^ BECH32M_CONST;
+    let mut out = [0u8; 6];
+    for (i, o) in out.iter_mut().enumerate() {
+        *o = ((pm >> (5 * (5 - i))) & 31) as u8;
+    }
+    out
+}
+
+fn convert_bits(data: &[u8], from_bits: u32, to_bits: u32, pad: bool) -> Option<Vec<u8>> {
+    let mut acc: u32 = 0;
+    let mut bits: u32 = 0;
+    let max_v: u32 = (1 << to_bits) - 1;
+    let max_acc: u32 = (1 << (from_bits + to_bits - 1)) - 1;
+    let mut out = Vec::with_capacity(data.len() * from_bits as usize / to_bits as usize + 1);
+    for &v in data {
+        if (v as u32) >> from_bits != 0 {
+            return None;
+        }
+        acc = ((acc << from_bits) | v as u32) & max_acc;
+        bits += from_bits;
+        while bits >= to_bits {
+            bits -= to_bits;
+            out.push(((acc >> bits) & max_v) as u8);
+        }
+    }
+    if pad {
+        if bits > 0 {
+            out.push(((acc << (to_bits - bits)) & max_v) as u8);
+        }
+    } else {
+        // No leftover partial group, and no padding bits set.
+        if bits >= from_bits || ((acc << (to_bits - bits)) & max_v) != 0 {
+            return None;
+        }
+    }
+    Some(out)
+}
+
+fn encode_bech32m(hrp: &str, data: &[u8]) -> String {
+    let mut result = String::with_capacity(hrp.len() + 1 + data.len() + 6);
+    result.push_str(hrp);
+    result.push('1');
+    let checksum = create_checksum(hrp, data);
+    for &d in data {
+        result.push(CHARSET[d as usize] as char);
+    }
+    for c in checksum {
+        result.push(CHARSET[c as usize] as char);
+    }
+    result
+}
+
+/// Decodes a bech32 string into (hrp, 5-bit data without checksum, is_bech32m).
+fn decode_bech32(s: &str) -> Result<(String, Vec<u8>, bool), AddressError> {
+    if s.is_empty() {
+        return Err(AddressError::Empty);
+    }
+    if s.len() < 8 {
+        return Err(AddressError::Checksum);
+    }
+    if s.len() > ENCODED_LEN {
+        return Err(AddressError::TooLong);
+    }
+    if s.as_bytes().iter().any(|&c| c.is_ascii_uppercase()) {
+        return Err(AddressError::NotLowercase);
+    }
+    let pos = s.rfind('1').ok_or(AddressError::Checksum)?;
+    if pos < 1 || pos + 7 > s.len() {
+        return Err(AddressError::Checksum);
+    }
+    let hrp = &s[..pos];
+    let data_part = &s[pos + 1..];
+    let combined: Vec<u8> = data_part
+        .as_bytes()
+        .iter()
+        .map(|&c| charset_pos(c).ok_or(AddressError::Checksum))
+        .collect::<Result<_, _>>()?;
+    let pm = {
+        let mut values = hrp_expand(hrp);
+        values.extend_from_slice(&combined);
+        polymod(&values)
+    };
+    if pm != BECH32M_CONST && pm != BECH32_CONST {
+        return Err(AddressError::Checksum);
+    }
+    let is_m = pm == BECH32M_CONST;
+    let n = combined.len();
+    Ok((hrp.to_string(), combined[..n - 6].to_vec(), is_m))
+}
+
+/// Validates a public key as a canonical, on-curve, prime-order-subgroup
+/// point — mirroring the Go reference. Without this an attacker could
+/// register an all-zero key whose zero signature verifies for every message.
+pub fn validate_pubkey(pubkey: &[u8]) -> Result<(), AddressError> {
+    if pubkey.len() != PUBKEY_SIZE {
+        return Err(AddressError::KeySize);
+    }
+    let arr: [u8; PUBKEY_SIZE] = pubkey.try_into().unwrap();
+    // ZIP-215 point validation (rejects off-curve). Non-canonical encodings
+    // are accepted as valid points by ZIP-215, so we check canonical by
+    // re-encoding below.
+    let vk = VerifyingKey::from_bytes(&arr).map_err(|_| AddressError::KeyNotOnCurve)?;
+    if vk.to_bytes() != arr {
+        return Err(AddressError::KeyNonCanonical);
+    }
+    // A small-order ("weak") key makes signatures forgeable or ambiguous.
+    if vk.is_weak() {
+        return Err(AddressError::KeySmallOrder);
+    }
+    Ok(())
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Address {
+    s: String,
+    key: [u8; PUBKEY_SIZE],
+}
+
+impl Address {
+    /// Encodes a validated public key as a version-0 trust address.
+    pub fn from_pubkey(pubkey: &[u8]) -> Result<Address, AddressError> {
+        validate_pubkey(pubkey)?;
+        let arr: [u8; PUBKEY_SIZE] = pubkey.try_into().unwrap();
+        let mut payload = Vec::with_capacity(PAYLOAD_SIZE);
+        payload.push(VERSION0);
+        payload.extend_from_slice(&arr);
+        let five = convert_bits(&payload, 8, 5, true).unwrap();
+        let s = encode_bech32m(HRP, &five);
+        Ok(Address { s, key: arr })
+    }
+
+    /// Strictly parses and validates a trust address.
+    pub fn parse(s: &str) -> Result<Address, AddressError> {
+        let (hrp, data5, is_m) = decode_bech32(s)?;
+        if !is_m {
+            return Err(AddressError::NotBech32m);
+        }
+        if hrp != HRP {
+            return Err(AddressError::WrongHrp);
+        }
+        let payload = convert_bits(&data5, 5, 8, false).ok_or(AddressError::Padding)?;
+        if payload.len() != PAYLOAD_SIZE {
+            return Err(AddressError::PayloadSize);
+        }
+        if payload[0] != VERSION0 {
+            return Err(AddressError::Version);
+        }
+        validate_pubkey(&payload[1..])?;
+        let mut key = [0u8; PUBKEY_SIZE];
+        key.copy_from_slice(&payload[1..]);
+        Ok(Address { s: s.to_string(), key })
+    }
+
+    pub fn to_string(&self) -> &str {
+        &self.s
+    }
+
+    pub fn pubkey(&self) -> &[u8; PUBKEY_SIZE] {
+        &self.key
+    }
+}
+
+impl std::fmt::Display for Address {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(&self.s)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn known_addresses() {
+        // From testdata/vectors/tce_vectors.json parties.
+        let cases = [
+            (
+                "8a88e3dd7409f195fd52db2d3cba5d72ca6709bf1d94121bf3748801b40f6f5c",
+                "trust1qz9g3c7awsylr90a2tdj6096t4ev5ecfhuwegysm7d6gsqd5pah4c5jya75",
+            ),
+            (
+                "8139770ea87d175f56a35466c34c7ecccb8d8a91b4ee37a25df60f5b8fc9b394",
+                "trust1qzqnjacw4p73wh6k5d2xds6v0mxvhrv2jx6wudazthmq7ku0exeeg4qse9s",
+            ),
+        ];
+        for (hexkey, addr) in cases {
+            let pk = hex::decode(hexkey).unwrap();
+            let a = Address::from_pubkey(&pk).unwrap();
+            assert_eq!(a.to_string(), addr);
+            let b = Address::parse(addr).unwrap();
+            assert_eq!(b.to_string(), addr);
+            let want: [u8; 32] = pk[..].try_into().unwrap();
+            assert_eq!(b.pubkey(), &want);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/autostart.rs b/src/autostart.rs
new file mode 100644
index 0000000..f2c8af5
--- /dev/null
+++ b/src/autostart.rs
@@ -0,0 +1,60 @@
+//! Autostart integration (`auto-launch`): register/unregister the app at
+//! login. Uses the XDG autostart entry on Linux, the run/registry key on
+//! Windows and the login item on macOS via the underlying crate.
+
+use std::path::Path;
+
+#[derive(Debug)]
+pub struct Autostart {
+    inner: auto_launch::AutoLaunch,
+}
+
+/// Application identity used for both the autostart entry and notifications.
+pub const APP_NAME: &str = "niko-trust";
+
+impl Autostart {
+    /// Builds an autostart registration for the currently running executable.
+    ///
+    /// `current_exe` is normally `std::env::current_exe()`. A silently-missing
+    /// binary is not fatal: the app can still run, it just won't autostart.
+    pub fn new(current_exe: &Path) -> Result<Autostart, auto_launch::Error> {
+        let path = current_exe
+            .to_str()
+            .ok_or(auto_launch::Error::AppPathNotSpecified)?;
+        let inner = auto_launch::AutoLaunchBuilder::new()
+            .set_app_name(APP_NAME)
+            .set_app_path(path)
+            .build()?;
+        Ok(Autostart { inner })
+    }
+
+    /// Idempotently registers the app to start at login.
+    pub fn enable(&self) -> Result<(), auto_launch::Error> {
+        self.inner.enable()
+    }
+
+    /// Idempotently removes the login entry.
+    pub fn disable(&self) -> Result<(), auto_launch::Error> {
+        self.inner.disable()
+    }
+
+    pub fn is_enabled(&self) -> Result<bool, auto_launch::Error> {
+        self.inner.is_enabled()
+    }
+}
+
+/// Writes nothing, never errors; useful when the caller cannot find the
+/// running binary.
+pub fn noop() -> bool {
+    true
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn app_name_is_stable() {
+        assert_eq!(APP_NAME, "niko-trust");
+    }
+}
\ No newline at end of file
diff --git a/src/book.rs b/src/book.rs
new file mode 100644
index 0000000..3cf9bc9
--- /dev/null
+++ b/src/book.rs
@@ -0,0 +1,83 @@
+//! Local address book: memorable labels for trust1… addresses.
+//!
+//! Entries map an address string to a free-form label ("Niko"); persistence
+//! lives in the vault file. The display helper renders known addresses as
+//! `Label (trust1qz8jr…7tx6w)` and unknown ones as just the shortened address.
+
+use std::collections::BTreeMap;
+
+#[derive(Debug, Default)]
+pub struct AddressBook {
+    entries: BTreeMap<String, String>,
+}
+
+impl AddressBook {
+    pub fn from_entries(entries: BTreeMap<String, String>) -> AddressBook {
+        AddressBook { entries }
+    }
+
+    pub fn entries(&self) -> &BTreeMap<String, String> {
+        &self.entries
+    }
+
+    pub fn label_of(&self, addr: &str) -> Option<&str> {
+        self.entries.get(addr).map(|s| s.as_str())
+    }
+
+    /// Sets (or clears, when `label` is blank) the label for an address.
+    /// Returns true when the map changed.
+    pub fn set_label(&mut self, addr: &str, label: &str) -> bool {
+        let label = label.trim();
+        if label.is_empty() {
+            self.entries.remove(addr).is_some()
+        } else {
+            match self.entries.get(addr) {
+                Some(cur) if cur == label => false,
+                _ => {
+                    self.entries.insert(addr.to_string(), label.to_string());
+                    true
+                }
+            }
+        }
+    }
+
+    /// Compact display form: `Niko (trust1qz8jr…7tx6w)` when known, otherwise
+    /// just the shortened address.
+    pub fn display(&self, addr: &str) -> String {
+        match self.label_of(addr) {
+            Some(l) => format!("{l} ({})", short_addr(addr)),
+            None => short_addr(addr),
+        }
+    }
+}
+
+/// Bech32 addresses are long; keep a compact form for the UI.
+pub fn short_addr(a: &str) -> String {
+    if a.len() <= 20 {
+        a.to_string()
+    } else {
+        format!("{}…{}", &a[..10], &a[a.len() - 6..])
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn display_known_and_unknown() {
+        let mut b = AddressBook::default();
+        let addr = "trust1qz8jrkwdnqscwrvptu69z6ntd2dp092s0fk25ayq94qlzsx649dszg7tx6w";
+        assert_eq!(b.display(addr), short_addr(addr));
+
+        assert!(b.set_label(addr, "Niko"));
+        assert_eq!(b.display(addr), format!("Niko ({})", short_addr(addr)));
+        assert_eq!(b.label_of(addr), Some("Niko"));
+
+        // Blank label clears the entry.
+        b.set_label(addr, "   ");
+        assert_eq!(b.display(addr), short_addr(addr));
+        // Clearing a missing entry reports no change.
+        assert!(!b.set_label(addr, ""));
+    }
+}
diff --git a/src/crypto.rs b/src/crypto.rs
new file mode 100644
index 0000000..970f9f8
--- /dev/null
+++ b/src/crypto.rs
@@ -0,0 +1,15 @@
+//! Sha-256 helpers: object content addressing.
+
+use sha2::{Digest, Sha256};
+
+/// SHA-256 of `data` as a `[u8; 32]`.
+pub fn sha256(data: &[u8]) -> [u8; 32] {
+    let mut h = Sha256::new();
+    h.update(data);
+    h.finalize().into()
+}
+
+/// Lowercase-hex content id of TCE bytes (the protocol object id).
+pub fn object_id(tce: &[u8]) -> String {
+    hex::encode(sha256(tce))
+}
\ No newline at end of file
diff --git a/src/inbox.rs b/src/inbox.rs
new file mode 100644
index 0000000..2e2482a
--- /dev/null
+++ b/src/inbox.rs
@@ -0,0 +1,278 @@
+//! Inbox: dedup, history and time validation for incoming approval requests.
+//!
+//! The relay returns a request in every poll until it is answered
+//! (one-response-per-request means an answered request stays listed after the
+//! response exists). The inbox keeps a seen-set so a request is surfaced only
+//! once, records the action taken for history, and refuses to act on requests
+//! whose window has lapsed or that arrived before they were supposed to be
+//! valid (clock skew, PROTOCOL.md §13.1).
+
+use std::collections::{HashMap, HashSet};
+
+use crate::address::Address;
+use crate::protocol::{Decision, MAX_CLOCK_SKEW};
+use crate::relay::IncomingRequest;
+
+/// The decision a request ended with, or none if still pending.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Outcome {
+    Pending,
+    Approved,
+    Denied,
+    /// Left unanswered and its window lapsed.
+    TimedOut,
+    /// Was not answered because it was already stale when seen.
+    Stale,
+}
+
+/// One item of history, for display and audit.
+#[derive(Debug, Clone)]
+pub struct HistoryItem {
+    pub request_id_hex: String,
+    pub sender: Address,
+    pub action: String,
+    pub message: String,
+    pub created_at: u64,
+    pub expires_at: u64,
+    pub outcome: Outcome,
+}
+
+/// Is `now` inside the request window with the ±120s skew allowance?
+/// Mirrors the reference `ValidateCurrent` (PROTOCOL.md §13.1): a request may
+/// be shown up to SKEW after expiry, and one whose creation is more than SKEW
+/// in the future is treated as invalid rather than trusted.
+pub fn in_window(created_at: u64, expires_at: u64, now: u64) -> bool {
+    if created_at > now && created_at - now > MAX_CLOCK_SKEW {
+        return false; // from the future beyond skew
+    }
+    if now > expires_at && now - expires_at > MAX_CLOCK_SKEW {
+        return false; // long expired
+    }
+    true
+}
+
+/// Plain in-memory inbox. Owned by one poll loop / UI controller.
+#[derive(Debug, Default)]
+pub struct Inbox {
+    /// request_id bytes already surfaced (hex kept for history lookup).
+    known: HashSet<[u8; 32]>,
+    /// Filled-in history: request_id bytes -> item.
+    history: HashMap<[u8; 32], HistoryItem>,
+}
+
+impl Inbox {
+    pub fn new() -> Inbox {
+        Inbox::default()
+    }
+
+    /// Number of requests currently pending (seen, not yet acted on).
+    pub fn pending_count(&self) -> usize {
+        self.history.values().filter(|h| h.outcome == Outcome::Pending).count()
+    }
+
+    /// Consolidated, most-recent-first list for display.
+    pub fn history(&self) -> Vec<&HistoryItem> {
+        let mut v: Vec<&HistoryItem> = self.history.values().collect();
+        v.sort_by_key(|h| std::cmp::Reverse(h.created_at));
+        v
+    }
+
+    /// Whether this request has already been surfaced.
+    pub fn is_known(&self, request_id: &[u8; 32]) -> bool {
+        self.known.contains(request_id)
+    }
+
+    /// Registers the outcome of a surfaced request.
+    pub fn set_outcome(&mut self, request_id: &[u8; 32], outcome: Outcome) {
+        if let Some(item) = self.history.get_mut(request_id) {
+            item.outcome = outcome;
+        }
+    }
+
+    /// Feeds a batch of incoming requests: records all *newly seen* ones into
+    /// history and returns them (caller then reconciles each against the
+    /// relay's responses feed before deciding what to surface).
+    ///
+    /// The initial outcome reflects the time window only (Pending / TimedOut /
+    /// Stale); `set_outcome` refines it with the actual decision afterwards.
+    /// Requests outside the window are never actionable regardless of outcome.
+    pub fn observe<'a>(
+        &mut self,
+        now: u64,
+        incoming: &'a [IncomingRequest],
+    ) -> Vec<&'a IncomingRequest> {
+        let mut new_ones: Vec<&'a IncomingRequest> = Vec::new();
+        for r in incoming {
+            let id = &r.request_id;
+            if !self.known.insert(*id) {
+                continue; // already surfaced
+            }
+            // Record regardless of validity, so an expired prompt is visible.
+            let outcome = if !in_window(r.request.created_at, r.request.expires_at, now) {
+                if r.request.expires_at != 0 && now > r.request.expires_at {
+                    Outcome::TimedOut
+                } else {
+                    Outcome::Stale
+                }
+            } else {
+                Outcome::Pending
+            };
+            let mut item = history_item(r);
+            item.outcome = outcome;
+            self.history.insert(*id, item);
+            new_ones.push(r);
+        }
+        new_ones
+    }
+
+    /// Recorded outcome for a request, if it has been seen.
+    pub fn outcome_of(&self, request_id: &[u8; 32]) -> Option<Outcome> {
+        self.history.get(request_id).map(|h| h.outcome)
+    }
+
+    /// Restores persisted history after a restart: items become known (so
+    /// they are never re-surfaced as prompts) and show up in history with
+    /// their saved outcomes. Bad entries are skipped silently.
+    pub fn restore(&mut self, items: Vec<HistoryItem>) {
+        for h in items {
+            let Ok(id_bytes) = hex::decode(&h.request_id_hex) else { continue };
+            let Ok(id) = <[u8; 32]>::try_from(id_bytes) else { continue };
+            self.known.insert(id);
+            self.history.insert(id, h);
+        }
+    }
+}
+
+fn history_item(r: &IncomingRequest) -> HistoryItem {
+    HistoryItem {
+        request_id_hex: hex::encode(r.request_id),
+        sender: r.sender.clone(),
+        action: r.request.action.clone(),
+        message: r.request.message.clone(),
+        created_at: r.request.created_at,
+        expires_at: r.request.expires_at,
+        outcome: Outcome::Pending,
+    }
+}
+
+/// Conviction: allow or deny, carried on the action taken for a request.
+impl From<Decision> for Outcome {
+    fn from(d: Decision) -> Self {
+        match d {
+            Decision::Allow => Outcome::Approved,
+            Decision::Deny => Outcome::Denied,
+        }
+    }
+}
+
+/// Human-readable reason shown next to history entries.
+pub fn outcome_label(o: Outcome) -> &'static str {
+    match o {
+        Outcome::Pending => "pending",
+        Outcome::Approved => "approved",
+        Outcome::Denied => "denied",
+        Outcome::TimedOut => "expired",
+        Outcome::Stale => "stale",
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::protocol::ApprovalRequest;
+    use crate::signer::Signer;
+    use crate::tce::NONCE_SIZE;
+
+    fn incoming(me: &Signer, sender: &Signer, action: &str) -> IncomingRequest {
+        let request = ApprovalRequest {
+            sender: sender.pubkey(),
+            recipient: me.pubkey(),
+            action: action.to_string(),
+            payload: Default::default(),
+            message: "m".to_string(),
+            created_at: 1_700_000_000,
+            expires_at: 1_700_000_030,
+            nonce: [0u8; NONCE_SIZE],
+        };
+        IncomingRequest {
+            request,
+            tce: vec![],
+            request_id: [0x11; 32],
+            sender: Address::from_pubkey(&sender.pubkey()).unwrap(),
+        }
+    }
+
+    #[test]
+    fn dedup_surfaces_once() {
+        let me = Signer::generate().unwrap();
+        let sender = Signer::generate().unwrap();
+        let mut boxed = Inbox::new();
+        let r = incoming(&me, &sender, "login");
+
+        let first = [r.clone()];
+        let one = boxed.observe(1_700_000_020, &first);
+        assert_eq!(one.len(), 1);
+
+        // Same request again -> nothing new.
+        let again = [r.clone()];
+        let two = boxed.observe(1_700_000_025, &again);
+        assert!(two.is_empty());
+        assert_eq!(boxed.pending_count(), 1);
+    }
+
+    #[test]
+    fn window_and_outcomes() {
+        let me = Signer::generate().unwrap();
+        let sender = Signer::generate().unwrap();
+        let mut boxed = Inbox::new();
+        let r = incoming(&me, &sender, "x");
+
+        // Inside window -> pending & fresh.
+        let inside_batch = [r.clone()];
+        let inside = boxed.observe(1_700_000_010, &inside_batch);
+        assert_eq!(inside.len(), 1);
+
+        // Long after expiry (beyond the skew allowance) -> TimedOut, recorded
+        // but never actionable. expires=1_700_000_030, +120s skew => valid
+        // until 1_700_000_150; 200 is past that.
+        let stale_id = [0x22; 32];
+        let mut stale = r.clone();
+        stale.request_id = stale_id;
+        let stale_batch = [stale];
+        let out = boxed.observe(1_700_000_200, &stale_batch);
+        assert_eq!(out.len(), 1, "expired request is recorded as new");
+        assert_eq!(
+            boxed.outcome_of(&stale_id),
+            Some(Outcome::TimedOut),
+            "expired request must not be pending"
+        );
+
+        // Long in the future -> not valid yet (Stale), not actionable.
+        let f = [0x33; 32];
+        let mut future = r.clone();
+        future.request_id = f;
+        future.request.created_at = 1_800_000_000;
+        future.request.expires_at = 1_800_000_030;
+        let future_batch = [future];
+        let out = boxed.observe(1_700_000_000, &future_batch);
+        assert_eq!(out.len(), 1);
+        assert_eq!(boxed.outcome_of(&f), Some(Outcome::Stale));
+    }
+
+    // The clippy placeholder above is removed; this test documents outcome
+    // transitions via set_outcome.
+    #[test]
+    fn outcome_changes() {
+        let me = Signer::generate().unwrap();
+        let sender = Signer::generate().unwrap();
+        let mut boxed = Inbox::new();
+        let r = incoming(&me, &sender, "login");
+        let b = [r.clone()];
+        boxed.observe(1_700_000_020, &b);
+        let id = r.request_id;
+        boxed.set_outcome(&id, Outcome::from(Decision::Allow));
+        let h = boxed.history();
+        assert_eq!(h[0].outcome, Outcome::Approved);
+        assert_eq!(outcome_label(h[0].outcome), "approved");
+    }
+}
\ No newline at end of file
diff --git a/src/keyring.rs b/src/keyring.rs
new file mode 100644
index 0000000..e651781
--- /dev/null
+++ b/src/keyring.rs
@@ -0,0 +1,241 @@
+//! Keyring: encrypts the 32-byte identity seed at rest with a passphrase.
+//!
+//! KDF = Argon2id (default params, 19 MiB); AEAD = XChaCha20-Poly1305 with a
+//! 24-byte random nonce; salt 16 bytes. The identity file is written with
+//! 0o600 permissions mirroring the seed's sensitivity. A wrong passphrase
+//! fails the AEAD tag check, so no separate password verifier is needed.
+
+use std::fs::OpenOptions;
+use std::io::Write;
+use std::path::{Path, PathBuf};
+
+use aead::Payload;
+use aead::{Aead, KeyInit};
+use chacha20poly1305::{XChaCha20Poly1305, XNonce};
+use zeroize::Zeroizing;
+
+use crate::signer::Signer;
+
+const FILE_VERSION: u8 = 1;
+const KDF_M: u32 = 19 * 1024; // 19 MiB (matches Argon2 default)
+const KDF_T: u32 = 2;
+const KDF_P: u32 = 1;
+
+#[derive(Debug)]
+pub enum KeyringError {
+    Io(std::io::Error),
+    Json(serde_json::Error),
+    /// Missing identity file or wrong passphrase.
+    Decrypt(String),
+    /// Directory creation failed.
+    Setup(String),
+}
+
+impl std::fmt::Display for KeyringError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            KeyringError::Io(e) => write!(f, "io: {e}"),
+            KeyringError::Json(e) => write!(f, "json: {e}"),
+            KeyringError::Decrypt(m) => write!(f, "{m}"),
+            KeyringError::Setup(m) => write!(f, "{m}"),
+        }
+    }
+}
+
+impl std::error::Error for KeyringError {}
+
+fn open_private(path: &Path) -> Result<std::fs::File, std::io::Error> {
+    let f = OpenOptions::new().create(true).write(true).truncate(true).open(path)?;
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::PermissionsExt;
+        f.set_permissions(std::fs::Permissions::from_mode(0o600))?;
+    }
+    Ok(f)
+}
+
+#[derive(serde::Serialize, serde::Deserialize)]
+struct FileFormat {
+    v: u8,
+    kdf: String,
+    m: u32,
+    t: u32,
+    p: u32,
+    salt: String,  // base64 16
+    nonce: String, // base64 24
+    cipher: String, // base64 ciphertext
+}
+
+fn derive_key(password: &str, salt: &[u8]) -> Result<Zeroizing<[u8; 32]>, KeyringError> {
+    use argon2::{Algorithm, Argon2, Params, Version};
+    let params = Params::new(KDF_M, KDF_T, KDF_P, Some(32))
+        .map_err(|e| KeyringError::Setup(format!("argon2 params: {e}")))?;
+    let argon = Argon2::new(Algorithm::Argon2id, Version::V0x13, params);
+    let mut key = Zeroizing::new([0u8; 32]);
+    argon
+        .hash_password_into(password.as_bytes(), salt, key.as_mut())
+        .map_err(|e| KeyringError::Setup(format!("argon2: {e}")))?;
+    Ok(key)
+}
+
+/// Loads or creates the identity store in the app config directory.
+pub struct Keyring {
+    dir: PathBuf,
+}
+
+impl Keyring {
+    pub fn new(dir: PathBuf) -> Result<Keyring, KeyringError> {
+        std::fs::create_dir_all(&dir)
+            .map_err(|e| KeyringError::Setup(format!("mkdir {}: {e}", dir.display())))?;
+        #[cfg(unix)]
+        {
+            use std::os::unix::fs::PermissionsExt;
+            let _ = std::fs::set_permissions(&dir, std::fs::Permissions::from_mode(0o700));
+        }
+        Ok(Keyring { dir })
+    }
+
+    pub fn identity_file(&self) -> PathBuf {
+        self.dir.join("identity.json")
+    }
+
+    pub fn has_identity(&self) -> bool {
+        self.identity_file().exists()
+    }
+
+    /// Encrypts a freshly generated seed under `password` and writes it out.
+    pub fn save_new_key(&self, password: &str, seed: &[u8; 32]) -> Result<(), KeyringError> {
+        let json = serde_json::to_vec_pretty(&encrypt_seed(password, seed)?)
+            .map_err(KeyringError::Json)?;
+        let mut f = open_private(&self.identity_file()).map_err(KeyringError::Io)?;
+        f.write_all(&json).map_err(KeyringError::Io)?;
+        Ok(())
+    }
+
+    /// Decrypts the stored seed. Wrong passphrase => Err(Decrypt).
+    pub fn load_key(&self, password: &str) -> Result<[u8; 32], KeyringError> {
+        let raw = std::fs::read_to_string(self.identity_file())
+            .map_err(|_| KeyringError::Decrypt("identity file missing".into()))?;
+        let blob: serde_json::Value = serde_json::from_str(&raw)
+            .map_err(|e| KeyringError::Decrypt(format!("bad file: {e}")))?;
+        decrypt_seed(password, &blob)
+    }
+
+    /// Loads the signer, if present and the passphrase is correct.
+    pub fn load_signer(&self, password: &str) -> Result<Signer, KeyringError> {
+        let seed = self.load_key(password)?;
+        Signer::from_seed(seed).map_err(|e| KeyringError::Decrypt(format!("bad seed: {e}")))
+    }
+}
+
+/// Encrypts a seed into an identity JSON value (the vault stores exactly this).
+pub fn encrypt_seed(password: &str, seed: &[u8; 32]) -> Result<serde_json::Value, KeyringError> {
+    let mut salt = [0u8; 16];
+    getrandom::fill(&mut salt).map_err(|e| KeyringError::Setup(format!("rng: {e}")))?;
+    let key = derive_key(password, &salt)?;
+
+    let cipher = XChaCha20Poly1305::new_from_slice(key.as_ref())
+        .expect("32-byte key from argon2id");
+    let mut nonce_bytes = [0u8; 24];
+    getrandom::fill(&mut nonce_bytes).map_err(|e| KeyringError::Setup(format!("rng: {e}")))?;
+    let nonce = XNonce::from(nonce_bytes);
+    let payload = Payload { msg: seed, aad: b"niko-trust/identity/v1" };
+    let ciphertext = cipher
+        .encrypt(&nonce, payload)
+        .map_err(|_| KeyringError::Setup("encrypt failed".into()))?;
+
+    let fmt = FileFormat {
+        v: FILE_VERSION,
+        kdf: "argon2id".into(),
+        m: KDF_M,
+        t: KDF_T,
+        p: KDF_P,
+        salt: base64::Engine::encode(&base64::engine::general_purpose::STANDARD, salt),
+        nonce: base64::Engine::encode(&base64::engine::general_purpose::STANDARD, nonce_bytes),
+        cipher: base64::Engine::encode(&base64::engine::general_purpose::STANDARD, ciphertext),
+    };
+    serde_json::to_value(&fmt).map_err(KeyringError::Json)
+}
+
+/// Decrypts a seed from an identity JSON value (vault-stored). A wrong
+/// passphrase fails the AEAD tag check => Err(Decrypt).
+pub fn decrypt_seed(
+    password: &str,
+    blob: &serde_json::Value,
+) -> Result<[u8; 32], KeyringError> {
+    let fmt: FileFormat =
+        serde_json::from_value(blob.clone()).map_err(|e| KeyringError::Decrypt(format!("bad blob: {e}")))?;
+    if fmt.v != FILE_VERSION || fmt.kdf != "argon2id" {
+        return Err(KeyringError::Decrypt("unsupported key file".into()));
+    }
+    let salt = base64::Engine::decode(&base64::engine::general_purpose::STANDARD, &fmt.salt)
+        .map_err(|_| KeyringError::Decrypt("bad salt".into()))?;
+    let nonce_b = base64::Engine::decode(&base64::engine::general_purpose::STANDARD, &fmt.nonce)
+        .map_err(|_| KeyringError::Decrypt("bad nonce".into()))?;
+    let ct = base64::Engine::decode(&base64::engine::general_purpose::STANDARD, &fmt.cipher)
+        .map_err(|_| KeyringError::Decrypt("bad cipher".into()))?;
+
+    // Use the params stored in the file.
+    let key = derive_key_with_params(password, &salt, fmt.m, fmt.t, fmt.p)?;
+
+    let cipher = XChaCha20Poly1305::new_from_slice(key.as_ref()).expect("32-byte key from argon2id");
+    let nonce_bytes: [u8; 24] = nonce_b
+        .try_into()
+        .map_err(|_| KeyringError::Decrypt("bad nonce length".into()))?;
+    let nonce = XNonce::from(nonce_bytes);
+    let payload = Payload { msg: ct.as_ref(), aad: b"niko-trust/identity/v1" };
+    let plain = cipher.decrypt(&nonce, payload).map_err(|_| {
+        KeyringError::Decrypt("неверный пароль или повреждённый файл ключа".into())
+    })?;
+    let seed: [u8; 32] = plain.try_into().map_err(|_| KeyringError::Decrypt("bad seed length".into()))?;
+    Ok(seed)
+}
+
+fn derive_key_with_params(
+    password: &str,
+    salt: &[u8],
+    m: u32,
+    t: u32,
+    p: u32,
+) -> Result<Zeroizing<[u8; 32]>, KeyringError> {
+    use argon2::{Algorithm, Argon2, Params, Version};
+    let params =
+        Params::new(m, t, p, Some(32)).map_err(|e| KeyringError::Setup(format!("argon2: {e}")))?;
+    let argon = Argon2::new(Algorithm::Argon2id, Version::V0x13, params);
+    let mut key = Zeroizing::new([0u8; 32]);
+    argon
+        .hash_password_into(password.as_bytes(), salt, key.as_mut())
+        .map_err(|e| KeyringError::Setup(format!("argon2: {e}")))?;
+    Ok(key)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn roundtrip_and_wrong_password() {
+        let dir = std::env::temp_dir().join(format!("nktrst-{}", std::process::id()));
+        let kr = Keyring::new(dir.clone()).unwrap();
+        assert!(!kr.has_identity());
+        let seed = [0xabu8; 32];
+        kr.save_new_key("correct horse", &seed).unwrap();
+        assert!(kr.has_identity());
+        assert_eq!(kr.load_key("correct horse").unwrap(), seed);
+        assert!(kr.load_key("wrong pass").is_err());
+        // clean up
+        let _ = std::fs::remove_file(kr.identity_file());
+        let _ = std::fs::remove_dir_all(dir);
+    }
+
+    #[test]
+    fn kdf_params_are_always_writeable() {
+        let dir = std::env::temp_dir().join(format!("nktrst2-{}", std::process::id()));
+        let kr = Keyring::new(dir.clone()).unwrap();
+        let seed = [7u8; 32];
+        kr.save_new_key("x", &seed).unwrap();
+        assert_eq!(kr.load_key("x").unwrap(), seed);
+        let _ = std::fs::remove_file(kr.identity_file());
+        let _ = std::fs::remove_dir_all(dir);
+    }
+}
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..cba0dd6
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,17 @@
+//! Niko Trust GUI — core library.
+//!
+//! Byte-exact TCE protocol client for the niko_trust relay. The GUI (main.rs,
+//! feature "gui") builds on these modules.
+
+pub mod address;
+pub mod autostart;
+pub mod book;
+pub mod crypto;
+pub mod inbox;
+pub mod keyring;
+pub mod notify;
+pub mod protocol;
+pub mod relay;
+pub mod signer;
+pub mod tce;
+pub mod vault;
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..d688bde
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,1741 @@
+//! Niko Trust — iced desktop app.
+//!
+//! Screens:
+//! - Lock: enter the password (or create a fresh identity on first run) and
+//!   the relay URL, then connect.
+//! - Main: polls the relay, surfaces approval requests (native notification +
+//!   an in-app card), records history.
+//!
+//! Built only with the `gui` feature (the crate default). The core library
+//! stays UI-free via `--no-default-features`.
+
+#[cfg(feature = "gui")]
+mod gui {
+    use std::collections::VecDeque;
+use std::sync::{Arc, Mutex};
+use std::time::Duration;
+
+use iced::futures::{channel as fchannel, SinkExt, Stream, StreamExt};
+use iced::widget::{button, container, scrollable, text, Checkbox, Column, Container, Row, Space, TextInput};
+use iced::widget::{checkbox, text_input};
+use iced::{alignment, border, Color, Element, Length, Size, Subscription, Task, Theme};
+
+use niko_trust_gui::book::{short_addr, AddressBook};
+use niko_trust_gui::inbox::{outcome_label, HistoryItem, Inbox, Outcome};
+use niko_trust_gui::keyring::{decrypt_seed, encrypt_seed};
+use niko_trust_gui::notify::{self, ApprovalNotification, PromptOutcome};
+use niko_trust_gui::protocol::Decision;
+use niko_trust_gui::relay::{IncomingRequest, IncomingResponse, Relay};
+use niko_trust_gui::signer::Signer;
+use niko_trust_gui::vault::{StoredItem, Vault};
+
+const APP_NAME: &str = "Niko Trust";
+const DEFAULT_RELAY_URL: &str = "https://trust.n1ko.dev";
+const POLL_INTERVAL: Duration = Duration::from_secs(5);
+const NATIVE_PROMPT_TIMEOUT: Duration = Duration::from_secs(120);
+const MIN_PASSWORD_LEN: usize = 8;
+
+/// Hands the native-notification outcome to the UI event loop. Only one prompt
+/// is active at a time, so a single slot is enough; the subscription takes it.
+static PROMPT_RX: Mutex<Option<fchannel::mpsc::Receiver<PromptOutcome>>> = Mutex::new(None);
+
+pub fn run() -> iced::Result {
+    iced::application(boot, update, view)
+        .title(APP_NAME)
+        .theme(theme_of)
+        .window(window_settings())
+        .subscription(subscription)
+        .run()
+}
+
+fn boot() -> (App, Task<Message>) {
+    let vault = Vault::load();
+    let book = AddressBook::from_entries(vault.address_book().clone());
+    let relay_url = if vault.relay_url().is_empty() {
+        DEFAULT_RELAY_URL.to_string()
+    } else {
+        vault.relay_url().to_string()
+    };
+    let has_identity = vault.identity_blob().is_some();
+    let app = App {
+        vault,
+        has_identity,
+        password: String::new(),
+        confirm: String::new(),
+        relay_url,
+        lock_error: None,
+        connecting: false,
+        pending_signer: None,
+        session: None,
+        book,
+        book_edit: None,
+        screen: Screen::Requests,
+        new_password: String::new(),
+        new_confirm: String::new(),
+        autostart_enabled: autostart_now(),
+    };
+    (app, Task::none())
+}
+
+/// Current autostart registration state (false on any error).
+fn autostart_now() -> bool {
+    std::env::current_exe()
+        .ok()
+        .and_then(|exe| niko_trust_gui::autostart::Autostart::new(&exe).ok())
+        .and_then(|a| a.is_enabled().ok())
+        .unwrap_or(false)
+}
+
+fn window_settings() -> iced::window::Settings {
+    iced::window::Settings {
+        size: Size::new(460.0, 720.0),
+        min_size: Some(Size::new(400.0, 520.0)),
+        ..Default::default()
+    }
+}
+
+/// The three tabs of the main shell.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum Screen {
+    Requests,
+    Book,
+    Settings,
+}
+
+struct App {
+    /// Single portable state file (identity + book + history + settings).
+    vault: Vault,
+    has_identity: bool,
+    password: String,
+    confirm: String,
+    relay_url: String,
+    lock_error: Option<String>,
+    connecting: bool,
+    pending_signer: Option<Signer>,
+    session: Option<Session>,
+    /// Local address book (address -> label), persisted in the vault.
+    book: AddressBook,
+    /// Open "add to address book" editor: address + label being typed.
+    book_edit: Option<BookEdit>,
+    /// Which tab is open (Requests is the main view).
+    screen: Screen,
+    new_password: String,
+    new_confirm: String,
+    /// Cached autostart state (filesystem/registry is not polled per frame).
+    autostart_enabled: bool,
+}
+
+/// The add-to-address-book editor state. An empty `addr` means a brand-new
+/// entry (the address itself is being typed).
+struct BookEdit {
+    addr: String,
+    label: String,
+    error: Option<String>,
+}
+
+/// An unlocked, connected session.
+struct Session {
+    signer: Signer,
+    relay: Arc<Relay>,
+    inbox: Inbox,
+    my_address: String,
+    queue: VecDeque<IncomingRequest>,
+    current: Option<Prompt>,
+    polling: bool,
+    responding: bool,
+    /// A 401-triggered re-login is in flight; suppress further reauths.
+    reconnecting: bool,
+    status: Option<String>,
+}
+
+/// The approval request currently awaiting the user's decision.
+struct Prompt {
+    req: IncomingRequest,
+    native_shown: bool,
+}
+
+#[derive(Clone)]
+enum Message {
+    PasswordChanged(String),
+    ConfirmChanged(String),
+    RelayUrlChanged(String),
+    Unlock,
+    Create,
+    /// Fresh identity generated + encrypted blob ready to store in the vault.
+    IdentityReady(Result<(Signer, serde_json::Value), String>),
+    Unlocked(Result<Signer, String>),
+    Connected(Result<Arc<Relay>, String>),
+    Tick,
+    Polled(Result<Vec<IncomingRequest>, String>),
+    PromptOutcome(PromptOutcome),
+    CopyText(String),
+    BookAdd(String),
+    BookLabel(String),
+    /// Typing the address of a brand-new entry.
+    BookAddr(String),
+    BookSave,
+    BookCancel,
+    BookDelete(String),
+    ShowTab(Screen),
+    NewPasswordChanged(String),
+    NewConfirmChanged(String),
+    ChangePassword,
+    PasswordUpdated(Result<serde_json::Value, String>),
+    ToggleAutostart(bool),
+    Approve,
+    Deny,
+    Responded {
+        id: [u8; 32],
+        decision: Decision,
+        result: Result<String, String>,
+    },
+    /// First time we see a request: check the relay for an existing response
+    /// before surfacing it (state is rebuilt from the relay after a restart).
+    AnswerChecked {
+        req: IncomingRequest,
+        result: Result<Vec<IncomingResponse>, String>,
+    },
+    /// Transparent re-login after a 401 (relay restarts drop all sessions).
+    Reauthed(Result<Arc<Relay>, String>),
+}
+
+// ---------------------------------------------------------------- polling
+
+fn subscription(state: &App) -> Subscription<Message> {
+    let mut subs: Vec<Subscription<Message>> = Vec::new();
+    if let Some(s) = &state.session {
+        subs.push(iced::time::every(POLL_INTERVAL).map(|_| Message::Tick));
+        if !s.responding {
+            if let Some(p) = &s.current {
+                if p.native_shown {
+                    subs.push(Subscription::run_with(p.req.request_id, |_| prompt_stream()));
+                }
+            }
+        }
+    }
+    Subscription::batch(subs)
+}
+
+/// Reads the native-notification outcome off the shared channel.
+fn prompt_stream() -> impl Stream<Item = Message> {
+    iced::stream::channel(1, async |mut sender| {
+        let rx = PROMPT_RX.lock().expect("prompt channel lock").take();
+        if let Some(mut rx) = rx {
+            while let Some(outcome) = rx.next().await {
+                if sender.send(Message::PromptOutcome(outcome)).await.is_err() {
+                    break;
+                }
+            }
+        }
+    })
+}
+
+// ---------------------------------------------------------------- update
+
+fn update(state: &mut App, msg: Message) -> Task<Message> {
+    match msg {
+        Message::PasswordChanged(v) => {
+            state.password = v;
+            Task::none()
+        }
+        Message::ConfirmChanged(v) => {
+            state.confirm = v;
+            Task::none()
+        }
+        Message::RelayUrlChanged(v) => {
+            state.relay_url = v;
+            Task::none()
+        }
+        Message::Unlock => unlock(state),
+        Message::Create => create(state),
+        Message::IdentityReady(r) => match r {
+            Ok((signer, blob)) => {
+                state.vault.set_identity_blob(blob);
+                state.has_identity = true;
+                unlocked(state, Ok(signer))
+            }
+            Err(e) => {
+                state.connecting = false;
+                state.lock_error = Some(format!("create failed: {e}"));
+                Task::none()
+            }
+        },
+        Message::Unlocked(r) => unlocked(state, r),
+        Message::Connected(r) => connected(state, r),
+        Message::Tick => poll(state),
+        Message::Polled(r) => polled(state, r),
+        Message::AnswerChecked { req, result } => answer_checked(state, req, result),
+        Message::Reauthed(r) => reauthed(state, r),
+        Message::PromptOutcome(o) => prompt_outcome(state, o),
+        Message::CopyText(t) => iced::clipboard::write(t),
+        Message::BookAdd(addr) => {
+            state.book_edit = Some(BookEdit { addr, label: String::new(), error: None });
+            Task::none()
+        }
+        Message::BookLabel(l) => {
+            if let Some(e) = state.book_edit.as_mut() {
+                e.label = l;
+            }
+            Task::none()
+        }
+        Message::BookAddr(a) => {
+            if let Some(e) = state.book_edit.as_mut() {
+                e.addr = a;
+                e.error = None;
+            }
+            Task::none()
+        }
+        Message::BookSave => {
+            let Some(e) = state.book_edit.take() else { return Task::none() };
+            let label = e.label.trim().to_string();
+            if e.addr.trim().is_empty() && !label.is_empty() {
+                // New entry without an address: put the editor back.
+                let mut edit = e;
+                edit.error = Some("address is required".to_string());
+                state.book_edit = Some(edit);
+                return Task::none();
+            }
+            if !e.addr.trim().is_empty() && !label.is_empty() {
+                // Validate the address before storing it.
+                if let Err(err) = niko_trust_gui::address::Address::parse(e.addr.trim()) {
+                    let mut edit = e;
+                    edit.error = Some(format!("invalid address: {err}"));
+                    state.book_edit = Some(edit);
+                    return Task::none();
+                }
+            }
+            state.book.set_label(e.addr.trim(), &label);
+            state
+                .vault
+                .set_address_book(state.book.entries().clone());
+            if let Some(s) = state.session.as_mut() {
+                s.status = Some(if label.is_empty() {
+                    "address book entry removed".to_string()
+                } else {
+                    format!("saved \"{}\" to address book", label)
+                });
+            }
+            Task::none()
+        }
+        Message::BookCancel => {
+            state.book_edit = None;
+            Task::none()
+        }
+        Message::BookDelete(addr) => {
+            state.book.set_label(&addr, "");
+            state.vault.set_address_book(state.book.entries().clone());
+            Task::none()
+        }
+        Message::ShowTab(tab) => {
+            // Persist relay edits when leaving the Settings tab.
+            if state.screen == Screen::Settings && tab != Screen::Settings {
+                state.vault.set_relay_url(state.relay_url.trim().to_string());
+            }
+            state.screen = tab;
+            state.book_edit = None;
+            Task::none()
+        }
+        Message::NewPasswordChanged(v) => {
+            state.new_password = v;
+            Task::none()
+        }
+        Message::NewConfirmChanged(v) => {
+            state.new_confirm = v;
+            Task::none()
+        }
+        Message::ChangePassword => {
+            let Some(s) = state.session.as_ref() else { return Task::none() };
+            if state.new_password.len() < MIN_PASSWORD_LEN {
+                if let Some(s) = state.session.as_mut() {
+                    s.status =
+                        Some(format!("password must be at least {MIN_PASSWORD_LEN} characters"));
+                }
+                return Task::none();
+            }
+            if state.new_password != state.new_confirm {
+                if let Some(s) = state.session.as_mut() {
+                    s.status = Some("passwords do not match".into());
+                }
+                return Task::none();
+            }
+            let seed = s.signer.seed();
+            let pass = state.new_password.clone();
+            Task::perform(
+                async move { encrypt_seed(&pass, &seed).map_err(|e| e.to_string()) },
+                Message::PasswordUpdated,
+            )
+        }
+        Message::PasswordUpdated(r) => match r {
+            Ok(blob) => {
+                state.vault.set_identity_blob(blob);
+                state.new_password.clear();
+                state.new_confirm.clear();
+                if let Some(s) = state.session.as_mut() {
+                    s.status = Some("password updated".to_string());
+                }
+                Task::none()
+            }
+            Err(e) => {
+                if let Some(s) = state.session.as_mut() {
+                    s.status = Some(format!("password update failed: {e}"));
+                }
+                Task::none()
+            }
+        },
+        Message::ToggleAutostart(on) => {
+            let res = std::env::current_exe()
+                .ok()
+                .and_then(|exe| niko_trust_gui::autostart::Autostart::new(&exe).ok())
+                .map(|a| if on { a.enable() } else { a.disable() });
+            state.autostart_enabled = match res {
+                Some(Ok(())) => on,
+                _ => state.autostart_enabled,
+            };
+            Task::none()
+        }
+        Message::Approve => decide(state, Decision::Allow),
+        Message::Deny => decide(state, Decision::Deny),
+        Message::Responded { id, decision, result } => responded(state, id, decision, result),
+    }
+}
+
+// ---------------------------------------------------------------- unlock
+
+fn unlock(state: &mut App) -> Task<Message> {
+    if state.password.is_empty() {
+        state.lock_error = Some("enter your password".into());
+        return Task::none();
+    }
+    state.lock_error = None;
+    state.connecting = true;
+    let Some(blob) = state.vault.identity_blob().cloned() else {
+        state.connecting = false;
+        state.lock_error = Some("no identity in vault".into());
+        return Task::none();
+    };
+    let password = state.password.clone();
+    Task::perform(
+        async move {
+            decrypt_seed(&password, &blob)
+                .map_err(|e| e.to_string())
+                .and_then(|seed| Signer::from_seed(seed).map_err(|e| e.to_string()))
+        },
+        Message::Unlocked,
+    )
+}
+
+fn create(state: &mut App) -> Task<Message> {
+    if state.password.len() < MIN_PASSWORD_LEN {
+        state.lock_error =
+            Some(format!("password must be at least {MIN_PASSWORD_LEN} characters"));
+        return Task::none();
+    }
+    if state.password != state.confirm {
+        state.lock_error = Some("passwords do not match".into());
+        return Task::none();
+    }
+    state.lock_error = None;
+    state.connecting = true;
+    let password = state.password.clone();
+    Task::perform(
+        async move {
+            let signer = Signer::generate().map_err(|e| e.to_string())?;
+            let blob = encrypt_seed(&password, &signer.seed()).map_err(|e| e.to_string())?;
+            Ok((signer, blob))
+        },
+        Message::IdentityReady,
+    )
+}
+
+fn unlocked(state: &mut App, r: Result<Signer, String>) -> Task<Message> {
+    match r {
+        Ok(signer) => {
+            state.vault.set_relay_url(state.relay_url.trim().to_string());
+            state.pending_signer = Some(signer.clone());
+            connect_task(signer, state.relay_url.trim().to_string())
+        }
+        Err(e) => {
+            state.connecting = false;
+            state.lock_error = Some(format!("unlock failed: {e}"));
+            Task::none()
+        }
+    }
+}
+
+fn connect_task(signer: Signer, url: String) -> Task<Message> {
+    Task::perform(
+        async move {
+            Relay::auth(&url, &signer, "*")
+                .map(Arc::new)
+                .map_err(|e| e.to_string())
+        },
+        Message::Connected,
+    )
+}
+
+fn connected(state: &mut App, r: Result<Arc<Relay>, String>) -> Task<Message> {
+    state.connecting = false;
+    match r {
+        Ok(relay) => {
+            let Some(signer) = state.pending_signer.take() else {
+                return Task::none();
+            };
+            let my_address = signer
+                .address()
+                .map(|a| format!("{a}"))
+                .unwrap_or_else(|e| format!("<address error: {e}>"));
+            // Restore persisted history so it survives relay restarts.
+            let mut inbox = Inbox::new();
+            let restored: Vec<HistoryItem> = state
+                .vault
+                .history()
+                .iter()
+                .filter_map(|s| HistoryItem::try_from(s).ok())
+                .collect();
+            inbox.restore(restored);
+            state.session = Some(Session {
+                signer,
+                relay,
+                inbox,
+                my_address,
+                queue: VecDeque::new(),
+                current: None,
+                polling: false,
+                responding: false,
+                reconnecting: false,
+                status: None,
+            });
+            Task::none()
+        }
+        Err(e) => {
+            state.lock_error = Some(format!("relay connect failed: {e}"));
+            Task::none()
+        }
+    }
+}
+
+// ---------------------------------------------------------------- poll
+
+/// Persists the current history into the vault (called after any change).
+fn snapshot_history(state: &mut App) {
+    let Some(s) = state.session.as_ref() else { return };
+    let items: Vec<StoredItem> =
+        s.inbox.history().into_iter().map(StoredItem::from).collect();
+    state.vault.set_history(items);
+}
+
+fn poll(state: &mut App) -> Task<Message> {
+    let Some(s) = state.session.as_mut() else {
+        return Task::none();
+    };
+    if s.polling || s.responding {
+        return Task::none();
+    }
+    s.polling = true;
+    let relay = s.relay.clone();
+    let signer = s.signer.clone();
+    Task::perform(
+        async move { relay.fetch_requests(&signer).map_err(|e| e.to_string()) },
+        Message::Polled,
+    )
+}
+
+fn polled(state: &mut App, r: Result<Vec<IncomingRequest>, String>) -> Task<Message> {
+    let Some(s) = state.session.as_mut() else {
+        return Task::none();
+    };
+    s.polling = false;
+    match r {
+        Ok(list) => {
+            let now = now_secs();
+            let fresh = s.inbox.observe(now, &list);
+            let n = fresh.len();
+            s.status = Some(if n == 0 {
+                "poll ok".to_string()
+            } else {
+                format!("checking {n} new request{}…", if n == 1 { "" } else { "s" })
+            });
+            let relay = s.relay.clone();
+            let tasks: Vec<Task<Message>> = fresh
+                .into_iter()
+                .map(|req| check_answered(relay.clone(), req.clone()))
+                .collect();
+            advance(s);
+            if n > 0 {
+                snapshot_history(state);
+            }
+            Task::batch(tasks)
+        }
+        Err(e) => {
+            s.status = Some(format!("poll failed: {e}"));
+            if is_auth_error(&e) {
+                return reauth(s);
+            }
+            Task::none()
+        }
+    }
+}
+
+/// Relay sessions are in-memory server-side: a relay restart invalidates every
+/// token, so a 401 means "log in again", not "give up".
+fn is_auth_error(e: &str) -> bool {
+    e.contains("401") || e.to_lowercase().contains("unauthorized")
+}
+
+/// Re-runs the challenge/assert handshake and swaps the relay client.
+fn reauth(s: &mut Session) -> Task<Message> {
+    if s.reconnecting {
+        return Task::none();
+    }
+    s.reconnecting = true;
+    let base = s.relay.base_url().to_string();
+    let signer = s.signer.clone();
+    Task::perform(
+        async move { Relay::auth(&base, &signer, "*").map(Arc::new).map_err(|e| e.to_string()) },
+        Message::Reauthed,
+    )
+}
+
+fn reauthed(state: &mut App, r: Result<Arc<Relay>, String>) -> Task<Message> {
+    let Some(s) = state.session.as_mut() else {
+        return Task::none();
+    };
+    s.reconnecting = false;
+    match r {
+        Ok(relay) => {
+            s.relay = relay;
+            s.status = Some("re-authenticated".to_string());
+            poll(state)
+        }
+        Err(e) => {
+            s.status = Some(format!("re-auth failed: {e}"));
+            Task::none()
+        }
+    }
+}
+
+/// Before surfacing a request, ask the relay whether it was already answered
+/// (the inbox is in-memory, so after a restart answered requests would
+/// otherwise reappear as pending and refuse re-answering with 422).
+fn check_answered(relay: std::sync::Arc<Relay>, req: IncomingRequest) -> Task<Message> {
+    Task::perform(
+        async move {
+            let rid = hex::encode(req.request_id);
+            let res = relay.fetch_responses(&rid).map_err(|e| e.to_string());
+            (req, res)
+        },
+        |(req, result)| Message::AnswerChecked { req, result },
+    )
+}
+
+fn answer_checked(
+    state: &mut App,
+    req: IncomingRequest,
+    result: Result<Vec<IncomingResponse>, String>,
+) -> Task<Message> {
+    let id = req.request_id;
+    let snapshot;
+    {
+        let Some(s) = state.session.as_mut() else {
+            return Task::none();
+        };
+        let already_visible = s.current.as_ref().is_some_and(|p| p.req.request_id == id)
+            || s.queue.iter().any(|q| q.request_id == id);
+        match result {
+            Ok(list) => {
+                let mine = list
+                    .into_iter()
+                    .find(|r| r.response.responder == s.signer.pubkey());
+                match mine {
+                    Some(r) => {
+                        let decision = r.response.decision;
+                        s.inbox.set_outcome(&id, Outcome::from(decision));
+                        s.queue.retain(|q| q.request_id != id);
+                        if s.current.as_ref().is_some_and(|p| p.req.request_id == id) {
+                            s.current = None;
+                            advance(s);
+                        }
+                        let label = outcome_label(decision.into());
+                        s.status = Some(format!("request already {label}"));
+                    }
+                    None => {
+                        // Genuinely unanswered: surface it now, but only when
+                        // its window is still open (stale stay history-only).
+                        if !already_visible
+                            && s.inbox.outcome_of(&id) == Some(Outcome::Pending)
+                        {
+                            s.queue.push_back(req);
+                        }
+                        let n = s.queue.len();
+                        s.status = Some(match n {
+                            1 => "1 new request".to_string(),
+                            k => format!("{k} queued requests"),
+                        });
+                        advance(s);
+                    }
+                }
+                snapshot = true;
+            }
+            Err(e) => {
+                // Can't tell; keep it visible rather than silently dropping.
+                if !already_visible {
+                    s.queue.push_back(req);
+                }
+                s.status = Some(format!("answer check failed: {e}"));
+                advance(s);
+                snapshot = false;
+            }
+        }
+    }
+    if snapshot {
+        snapshot_history(state);
+    }
+    Task::none()
+}
+
+// ---------------------------------------------------------------- prompt
+
+fn prompt_outcome(state: &mut App, o: PromptOutcome) -> Task<Message> {
+    match o {
+        PromptOutcome::Approved => decide(state, Decision::Allow),
+        PromptOutcome::Denied => decide(state, Decision::Deny),
+        PromptOutcome::Ignored => {
+            // Native toast dismissed: keep the in-app card as the fallback.
+            if let Some(s) = state.session.as_mut() {
+                if let Some(p) = s.current.as_mut() {
+                    p.native_shown = false;
+                }
+            }
+            Task::none()
+        }
+    }
+}
+
+fn decide(state: &mut App, decision: Decision) -> Task<Message> {
+    let Some(s) = state.session.as_mut() else {
+        return Task::none();
+    };
+    if s.responding {
+        return Task::none();
+    }
+    let Some(req) = s.current.as_ref().map(|p| p.req.clone()) else {
+        return Task::none();
+    };
+    s.responding = true;
+    let relay = s.relay.clone();
+    let signer = s.signer.clone();
+    Task::perform(
+        async move {
+            let res = relay.respond(&signer, &req.request, &req.tce, decision);
+            (req.request_id, decision, res.map_err(|e| e.to_string()))
+        },
+        |(id, d, res)| Message::Responded { id, decision: d, result: res },
+    )
+}
+
+fn responded(
+    state: &mut App,
+    id: [u8; 32],
+    decision: Decision,
+    result: Result<String, String>,
+) -> Task<Message> {
+    let mut snapshot = false;
+    {
+        let Some(s) = state.session.as_mut() else {
+            return Task::none();
+        };
+        s.responding = false;
+        match result {
+            Ok(object_id) => {
+                s.inbox.set_outcome(&id, decision.into());
+                s.current = None;
+                s.status =
+                    Some(format!("response {} stored ({object_id})", decision.as_str()));
+                advance(s);
+                snapshot = true;
+            }
+            Err(e) => {
+                // The server refuses a second answer (one response per
+                // request): our local state is behind, reconcile from relay.
+                if e.contains("already answered") {
+                    if let Some(p) = s.current.as_ref().filter(|p| p.req.request_id == id) {
+                        let req = p.req.clone();
+                        s.status = Some("reconciling with relay…".to_string());
+                        return check_answered(s.relay.clone(), req);
+                    }
+                    s.status = Some("already answered elsewhere".to_string());
+                    return Task::none();
+                }
+                if is_auth_error(&e) {
+                    // Keep the card up; after re-login the user can answer.
+                    s.status = Some("session expired, re-authenticating…".to_string());
+                    return reauth(s);
+                }
+                let expired = s.current.as_ref().is_some_and(|p| {
+                    !niko_trust_gui::inbox::in_window(
+                        p.req.request.created_at,
+                        p.req.request.expires_at,
+                        now_secs(),
+                    )
+                });
+                s.status = Some(format!("response failed: {e}"));
+                if expired {
+                    s.inbox.set_outcome(&id, Outcome::TimedOut);
+                    s.current = None;
+                    advance(s);
+                    snapshot = true;
+                }
+            }
+        }
+    }
+    if snapshot {
+        snapshot_history(state);
+    }
+    Task::none()
+}
+
+/// Makes the next queued request the active prompt (with a native toast when
+/// the platform supports one).
+fn advance(s: &mut Session) {
+    if s.current.is_some() {
+        return;
+    }
+    if let Some(req) = s.queue.pop_front() {
+        let native_shown = notify::interactive_supported();
+        if native_shown {
+            fire_native(&req);
+        }
+        s.current = Some(Prompt { req, native_shown });
+    }
+}
+
+fn fire_native(req: &IncomingRequest) {
+    let n = ApprovalNotification {
+        sender: format!("{}", req.sender),
+        action: req.request.action.clone(),
+        message: req.request.message.clone(),
+    };
+    let (tx, rx) = fchannel::mpsc::channel(1);
+    *PROMPT_RX.lock().expect("prompt channel lock") = Some(rx);
+    std::thread::spawn(move || {
+        let handle = notify::show(n);
+        let outcome = handle.wait_timeout(NATIVE_PROMPT_TIMEOUT);
+        let mut tx = tx;
+        let _ = tx.try_send(outcome);
+    });
+}
+
+// ---------------------------------------------------------------- view
+
+fn view<'a>(state: &'a App) -> Element<'a, Message> {
+    match &state.session {
+        None => view_locked(state),
+        Some(_) => view_main(state),
+    }
+}
+
+fn view_locked<'a>(state: &'a App) -> Element<'a, Message> {
+    let mut items: Vec<Element<Message>> = Vec::new();
+    items.push(
+        Row::with_children(vec![
+            text("Niko").size(32).color(c(COL_TEXT)).into(),
+            text("Trust").size(32).color(c(COL_ACCENT)).into(),
+        ])
+        .into(),
+    );
+    items.push(
+        text(if state.has_identity {
+            "Unlock your identity."
+        } else {
+            "Create a new identity with a password."
+        })
+        .size(14)
+        .color(label_color())
+        .into(),
+    );
+    items.push(Space::new().height(24).into());
+
+    items.push(text("Relay").size(13).color(label_color()).into());
+    items.push(
+        TextInput::new("https://trust.n1ko.dev", &state.relay_url)
+            .on_input(Message::RelayUrlChanged)
+            .width(Length::Fill)
+            .padding(10).style(input_style)
+            .into(),
+    );
+    items.push(Space::new().height(14).into());
+
+    items.push(text("Password").size(13).color(label_color()).into());
+    items.push(
+        TextInput::new("password", &state.password)
+            .secure(true)
+            .on_input(Message::PasswordChanged)
+            .on_submit(if state.has_identity {
+                Message::Unlock
+            } else {
+                Message::Create
+            })
+            .width(Length::Fill)
+            .padding(10).style(input_style)
+            .into(),
+    );
+
+    if !state.has_identity {
+        items.push(Space::new().height(14).into());
+        items.push(text("Confirm password").size(13).color(label_color()).into());
+        items.push(
+            TextInput::new("password again", &state.confirm)
+                .secure(true)
+                .on_input(Message::ConfirmChanged)
+                .on_submit(Message::Create)
+                .width(Length::Fill)
+                .padding(10)
+                .into(),
+        );
+    }
+
+    items.push(Space::new().height(24).into());
+    let (label, msg) = if state.has_identity {
+        ("Unlock", Message::Unlock)
+    } else {
+        ("Create identity", Message::Create)
+    };
+    items.push(
+        button(text(label))
+            .style(btn_primary)
+            .on_press_maybe((!state.connecting).then_some(msg))
+            .width(Length::Fill)
+            .padding(12)
+            .into(),
+    );
+
+    if state.connecting {
+        items.push(Space::new().height(10).into());
+        items.push(
+            text("Connecting…")
+                .size(13)
+                .color(label_color())
+                .into(),
+        );
+    }
+    if let Some(e) = &state.lock_error {
+        items.push(Space::new().height(10).into());
+        items.push(text(e.clone()).size(13).color(error_color()).into());
+    }
+
+    let col = Column::with_children(items).spacing(10);
+    let card = Container::new(col)
+        .width(400)
+        .padding(28)
+        .style(card_style);
+    Container::new(card)
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .center_x(Length::Fill)
+        .center_y(Length::Fill)
+        .into()
+}
+
+/// Main shell: fixed top bar, scrollable content, fixed bottom tab bar.
+/// Everything is capped to a phone-like column and centered on wide screens.
+fn view_main<'a>(state: &'a App) -> Element<'a, Message> {
+    let s = state.session.as_ref().expect("view_main without session");
+
+    let content: Element<Message> = match state.screen {
+        Screen::Requests => view_requests(state),
+        Screen::Book => view_book_list(state),
+        Screen::Settings => view_settings(state),
+    };
+
+    let shell = Column::with_children(vec![
+        top_bar(s.status.as_ref()),
+        divider().into(),
+        Container::new(content)
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .padding(iced::Padding { top: 14.0, right: 6.0, bottom: 12.0, left: 6.0 })
+            .into(),
+        tab_bar(state.screen),
+    ])
+    .width(Length::Fill)
+    .height(Length::Fill)
+    .padding(12);
+
+    // Fixed-width column…
+    let capped =
+        Container::new(shell).width(APP_MAX_WIDTH as f32).height(Length::Fill);
+    // …centered by a full-size outer container.
+    Container::new(capped)
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .center_x(Length::Fill)
+        .into()
+}
+
+/// Maximum width of the app column (px). Keeps the layout compact on
+/// large monitors instead of stretching edge to edge.
+const APP_MAX_WIDTH: u32 = 540;
+
+/// Brand + live status pill.
+fn top_bar<'a>(status: Option<&String>) -> Element<'a, Message> {
+    Row::with_children(vec![
+        Row::with_children(vec![
+            text("niko").size(19).color(c(COL_TEXT)).into(),
+            text("trust").size(19).color(c(COL_ACCENT)).into(),
+        ])
+        .align_y(alignment::Vertical::Center)
+        .into(),
+        Space::new().width(Length::Fill).into(),
+        status_pill(status),
+    ])
+    .align_y(alignment::Vertical::Center)
+    .width(Length::Fill)
+    .padding([4, 4])
+    .into()
+}
+
+/// One horizontal hairline.
+fn divider() -> Container<'static, Message> {
+    Container::new(Space::new().height(1))
+        .width(Length::Fill)
+        .style(|_t| container::Style {
+            background: Some(c(COL_BORDER).into()),
+            ..Default::default()
+        })
+}
+
+/// A small colored dot + short status text (truncated).
+fn status_pill<'a>(status: Option<&String>) -> Element<'a, Message> {
+    let text_s = status.map(String::as_str).unwrap_or("online");
+    let lower = text_s.to_lowercase();
+    let color = if ["failed", "error", "refus", "timeout", "expired"]
+        .iter()
+        .any(|w| lower.contains(w))
+    {
+        COL_RED
+    } else if ["re-auth", "reconcil", "checking", "waiting"].iter().any(|w| lower.contains(w)) {
+        COL_AMBER
+    } else {
+        COL_GREEN
+    };
+    let mut label = text_s.to_string();
+    if label.chars().count() > 34 {
+        label = format!("{}…", label.chars().take(34).collect::<String>());
+    }
+
+    Row::with_children(vec![
+        dot(color),
+        Space::new().width(7).into(),
+        text(label).size(11).color(label_color()).into(),
+    ])
+    .align_y(alignment::Vertical::Center)
+    .into()
+}
+
+/// A filled circle of the given color.
+fn dot(color: u32) -> Element<'static, Message> {
+    Container::new(Space::new().width(8).height(8))
+        .style(move |_t| container::Style {
+            background: Some(c(color).into()),
+            border: border(Color::TRANSPARENT, 0.0, 4.0),
+            ..Default::default()
+        })
+        .into()
+}
+
+/// Bottom navigation dock with an active segment highlight.
+fn tab_bar(active: Screen) -> Element<'static, Message> {
+    let tab = |label: &'static str, sc: Screen| {
+        button(
+            text(label)
+                .size(13)
+                .width(Length::Fill)
+                .align_x(alignment::Horizontal::Center),
+        )
+        .style(move |t, st| btn_tab(sc == active, t, st))
+        .on_press(Message::ShowTab(sc))
+        .width(Length::Fill)
+        .padding([9, 0])
+    };
+    let tabs: Vec<Element<Message>> = vec![
+        tab("Requests", Screen::Requests).into(),
+        Space::new().width(6).into(),
+        tab("Contacts", Screen::Book).into(),
+        Space::new().width(6).into(),
+        tab("Settings", Screen::Settings).into(),
+    ];
+    Container::new(Row::with_children(tabs).width(Length::Fill))
+    .width(Length::Fill)
+    .padding([6, 6])
+    .style(|_t| container::Style {
+        background: Some(c(COL_SURFACE).into()),
+        border: border(c(COL_BORDER), 1.0, 14.0),
+        ..Default::default()
+    })
+    .into()
+}
+
+fn btn_tab(is_active: bool, _t: &Theme, s: button::Status) -> button::Style {
+    let pressed = matches!(s, button::Status::Pressed);
+    if is_active {
+        let bg = match s {
+            button::Status::Pressed => c(0x7A34D9),
+            button::Status::Hovered => c(0x8A3DF0),
+            _ => c(COL_ACCENT),
+        };
+        button::Style {
+            background: Some(bg.into()),
+            text_color: c(0xFFFFFF),
+            border: border(c(COL_ACCENT), 0.0, 9.0),
+            ..Default::default()
+        }
+    } else {
+        button::Style {
+            background: Some(c(if pressed { 0x181D26 } else { 0x12151D }).into()),
+            text_color: c(if matches!(s, button::Status::Hovered) { COL_TEXT } else { 0x767E92 }),
+            border: border(Color::TRANSPARENT, 0.0, 9.0),
+            ..Default::default()
+        }
+    }
+}
+
+/// Requests tab: identity card, active prompt, history.
+fn view_requests<'a>(state: &'a App) -> Element<'a, Message> {
+    let s = state.session.as_ref().expect("view_requests without session");
+    let mut items: Vec<Element<Message>> = Vec::new();
+
+    // Identity card.
+    items.push(
+        Container::new(
+            Column::with_children(vec![
+                text("MY ADDRESS").size(10).color(label_color()).into(),
+                Row::with_children(vec![
+                    text(short_addr(&s.my_address)).size(15).color(c(COL_TEXT)).into(),
+                    Space::new().width(Length::Fill).into(),
+                    button(text("copy").size(12))
+                        .style(btn_secondary)
+                        .on_press(Message::CopyText(s.my_address.clone()))
+                        .padding([4, 12])
+                        .into(),
+                ])
+                .align_y(alignment::Vertical::Center)
+                .width(Length::Fill)
+                .into(),
+            ])
+            .spacing(5),
+        )
+        .width(Length::Fill)
+        .padding(14)
+        .style(card_style)
+        .into(),
+    );
+
+    if let Some(edit) = &state.book_edit {
+        items.push(Space::new().height(12).into());
+        items.push(view_book_editor(state, edit));
+    }
+
+    items.push(Space::new().height(12).into());
+
+    if let Some(p) = &s.current {
+        items.push(view_prompt(state, p));
+        items.push(Space::new().height(16).into());
+    }
+
+    items.push(
+        Row::with_children(vec![
+            text("History").size(15).color(c(COL_TEXT)).into(),
+            Space::new().width(Length::Fill).into(),
+            text(format!("{} total", s.inbox.history().len()))
+                .size(11)
+                .color(label_color())
+                .into(),
+        ])
+        .align_y(alignment::Vertical::Center)
+        .into(),
+    );
+    items.push(Space::new().height(8).into());
+    items.push(view_history(state));
+
+    scrollable(Column::with_children(items).spacing(0).width(Length::Fill))
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .style(scroll_style)
+        .into()
+}
+
+
+/// Settings screen: relay URL, autostart, password change.
+fn view_settings<'a>(state: &'a App) -> Element<'a, Message> {
+    let can_change = state.session.is_some()
+        && state.new_password.len() >= MIN_PASSWORD_LEN
+        && !state.new_confirm.is_empty();
+
+    let items: Vec<Element<Message>> = vec![
+        text("Relay").size(13).color(label_color()).into(),
+        TextInput::new("https://trust.n1ko.dev", &state.relay_url)
+            .on_input(Message::RelayUrlChanged)
+            .width(Length::Fill)
+            .padding(10).style(input_style)
+            .into(),
+        Space::new().height(16).into(),
+        Checkbox::new(state.autostart_enabled)
+            .label("Launch at startup")
+            .on_toggle(Message::ToggleAutostart)
+            .size(18)
+            .style(checkbox_style)
+            .into(),
+        Space::new().height(24).into(),
+        text("Change password").size(16).into(),
+        TextInput::new("new password", &state.new_password)
+            .secure(true)
+            .on_input(Message::NewPasswordChanged)
+            .width(Length::Fill)
+            .padding(10).style(input_style)
+            .into(),
+        Space::new().height(8).into(),
+        TextInput::new("repeat new password", &state.new_confirm)
+            .secure(true)
+            .on_input(Message::NewConfirmChanged)
+            .on_submit(Message::ChangePassword)
+            .width(Length::Fill)
+            .padding(10).style(input_style)
+            .into(),
+        Space::new().height(12).into(),
+        button(text("Update password"))
+            .style(btn_primary)
+            .on_press_maybe(can_change.then_some(Message::ChangePassword))
+            .width(Length::Fill)
+            .padding(12)
+            .into(),
+    ];
+
+    scrollable(Column::with_children(items).spacing(8).width(Length::Fill)).style(scroll_style)
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .into()
+}
+
+/// A clickable address chip: pressing it copies the *full* address. Unknown
+/// addresses get an "add" button that opens the address-book editor.
+fn addr_line<'a>(
+    book: &'a AddressBook,
+    addr: &str,
+    size: f32,
+) -> Vec<Element<'a, Message>> {
+    let known = book.label_of(addr).is_some();
+    let mut out: Vec<Element<Message>> = Vec::new();
+    out.push(
+        button(text(book.display(addr)).size(size))
+            .style(btn_text)
+            .on_press(Message::CopyText(addr.to_string()))
+            .padding(0)
+            .into(),
+    );
+    if !known {
+        out.push(Space::new().width(4).into());
+        out.push(
+            button(text("+book").size(size - 1.0))
+                .style(btn_secondary)
+                .on_press(Message::BookAdd(addr.to_string()))
+                .padding([2, 8])
+                .into(),
+        );
+    }
+    out
+}
+
+/// Inline editor for a label of one address. An empty `addr` means a new
+/// entry: the address itself becomes editable.
+fn view_book_editor<'a>(_state: &'a App, e: &'a BookEdit) -> Element<'a, Message> {
+    let mut body: Vec<Element<Message>> = vec![text("Address book").size(14).into()];
+    if e.addr.is_empty() {
+        body.push(
+            TextInput::new("trust1… address", &e.addr)
+                .on_input(Message::BookAddr)
+                .width(Length::Fill)
+                .padding(8).style(input_style)
+                .into(),
+        );
+    } else {
+        body.push(text(short_addr(&e.addr)).size(12).color(label_color()).into());
+    }
+    body.push(
+        TextInput::new("label", &e.label)
+            .on_input(Message::BookLabel)
+            .on_submit(Message::BookSave)
+            .width(Length::Fill)
+            .padding(8)
+            .into(),
+    );
+    if let Some(err) = &e.error {
+        body.push(text(err.clone()).size(12).color(error_color()).into());
+    }
+    body.push(
+        Row::with_children(vec![
+            button(text(if e.label.trim().is_empty() && !e.addr.is_empty() {
+                "Remove"
+            } else {
+                "Save"
+            }))
+            .style(btn_primary)
+            .on_press(Message::BookSave)
+            .padding([6, 16])
+            .into(),
+            Space::new().width(8).into(),
+            button(text("Cancel"))
+                .style(btn_secondary)
+                .on_press(Message::BookCancel)
+                .padding([6, 16])
+                .into(),
+        ])
+        .align_y(alignment::Vertical::Center)
+        .into(),
+    );
+
+    Container::new(Column::with_children(body).spacing(8))
+        .width(Length::Fill)
+        .padding(14)
+        .style(card_style)
+        .into()
+}
+
+/// Full address-book screen: browse, copy, edit and delete entries.
+fn view_book_list<'a>(state: &'a App) -> Element<'a, Message> {
+    let mut items: Vec<Element<Message>> = Vec::new();
+
+    if let Some(edit) = &state.book_edit {
+        items.push(view_book_editor(state, edit));
+        items.push(Space::new().height(10).into());
+    }
+
+    let entries: Vec<(&String, &String)> = state.book.entries().iter().collect();
+    if entries.is_empty() && state.book_edit.is_none() {
+        items.push(
+            text("No entries yet.")
+                .size(13)
+                .color(c(0x6B7280))
+                .into(),
+        );
+    }
+    for (addr, label) in entries {
+        items.push(
+            Row::with_children(vec![
+                Column::with_children(vec![
+                    text(label.clone()).size(13).into(),
+                    text(short_addr(addr)).size(11).color(label_color()).into(),
+                ])
+                .spacing(2)
+                .width(Length::Fill)
+                .into(),
+                button(text("copy"))
+                    .style(btn_secondary)
+                    .on_press(Message::CopyText(addr.clone()))
+                    .padding([4, 10])
+                    .into(),
+                Space::new().width(6).into(),
+                button(text("edit"))
+                    .style(btn_secondary)
+                    .on_press(Message::BookAdd(addr.clone()))
+                    .padding([4, 10])
+                    .into(),
+                Space::new().width(6).into(),
+                button(text("del"))
+                    .style(btn_danger)
+                    .on_press(Message::BookDelete(addr.clone()))
+                    .padding([4, 10])
+                    .into(),
+            ])
+            .align_y(alignment::Vertical::Center)
+            .into(),
+        );
+    }
+
+    items.push(Space::new().height(10).into());
+    items.push(
+        button(text("+ Add entry"))
+            .style(btn_secondary)
+            .on_press(Message::BookAdd(String::new()))
+            .padding([6, 14])
+            .into(),
+    );
+
+    scrollable(Column::with_children(items).spacing(8).width(Length::Fill)).style(scroll_style)
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .into()
+}
+
+fn view_prompt<'a>(state: &'a App, p: &'a Prompt) -> Element<'a, Message> {
+    let s = state.session.as_ref().expect("view_prompt without session");
+    let actions = if s.responding {
+        Row::with_children(vec![text("Submitting…").size(14).into()])
+    } else {
+        Row::with_children(vec![
+            button(text("Approve"))
+                .style(btn_success)
+                .on_press(Message::Approve)
+                .padding(10)
+                .into(),
+            Space::new().width(8).into(),
+            button(text("Deny"))
+                .style(btn_danger)
+                .on_press(Message::Deny)
+                .padding(10)
+                .into(),
+        ])
+    };
+
+    let sender_addr = p.req.sender.to_string();
+    let mut from_children: Vec<Element<Message>> =
+        vec![text("from").size(13).color(label_color()).into()];
+    from_children.push(Space::new().width(4).into());
+    from_children.extend(addr_line(&state.book, sender_addr, 13.0));
+    let from_line: Element<Message> =
+        Row::with_children(from_children).align_y(alignment::Vertical::Center).into();
+
+    let body = Column::with_children(vec![
+        text("Approval requested").size(18).color(c(COL_ACCENT)).into(),
+        from_line,
+        text(p.req.request.action.clone()).size(16).into(),
+        text(p.req.request.message.clone()).size(14).into(),
+        text(expires_in(p)).size(12).color(label_color()).into(),
+        Space::new().height(4).into(),
+        actions.into(),
+    ])
+    .spacing(8);
+
+    Container::new(body)
+        .width(Length::Fill)
+        .padding(18)
+        .style(|_t| container::Style {
+            background: Some(c(COL_SURFACE).into()),
+            border: border(Color::from_rgba(0.60, 0.27, 1.0, 0.55), 1.2, 16.0),
+            ..Default::default()
+        })
+        .into()
+}
+
+// ---------------------------------------------------------------- theme
+//
+// Dark "crypto" look: deep blue-black surfaces, violet accent, mint green for
+// confirmations. All widget styles are explicit, so the look is stable.
+
+fn c(hex: u32) -> Color {
+    Color::from_rgb8((hex >> 16) as u8, ((hex >> 8) & 0xff) as u8, (hex & 0xff) as u8)
+}
+
+const COL_BG: u32 = 0x0A0C12; // app background
+const COL_SURFACE: u32 = 0x12151D; // cards
+const COL_FIELD: u32 = 0x0E1118; // inputs
+const COL_BORDER: u32 = 0x242A38;
+const COL_TEXT: u32 = 0xE8EBF2;
+const COL_MUTED: u32 = 0x8B93A7;
+const COL_ACCENT: u32 = 0x9945FF; // violet (Solana-ish)
+const COL_GREEN: u32 = 0x14F195; // mint (Solana-ish)
+const COL_RED: u32 = 0xE5484D;
+const COL_AMBER: u32 = 0xFFC24B;
+
+fn border(color: Color, width: f32, radius: f32) -> border::Border {
+    border::Border { color, width, radius: radius.into() }
+}
+
+/// The application theme handed to iced (covers widgets without custom styles).
+fn app_theme() -> Theme {
+    Theme::custom(
+        "niko-dark",
+        iced::theme::Palette {
+            background: c(COL_BG),
+            text: c(COL_TEXT),
+            primary: c(COL_ACCENT),
+            success: c(COL_GREEN),
+            warning: c(COL_AMBER),
+            danger: c(COL_RED),
+        },
+    )
+}
+
+/// `.theme` wants a plain function of the app state.
+fn theme_of(_state: &App) -> Theme {
+    app_theme()
+}
+
+fn btn_primary(_t: &Theme, s: button::Status) -> button::Style {
+    let bg = match s {
+        button::Status::Active => c(COL_ACCENT),
+        button::Status::Hovered => c(0x8A3DF0),
+        button::Status::Pressed => c(0x7A34D9),
+        button::Status::Disabled => c(0x251E3A),
+    };
+    let txt = if matches!(s, button::Status::Disabled) { c(0x6B6580) } else { c(0xFFFFFF) };
+    button::Style {
+        background: Some(bg.into()),
+        text_color: txt,
+        border: border(c(COL_ACCENT), 0.0, 10.0),
+        ..Default::default()
+    }
+}
+
+fn btn_secondary(_t: &Theme, s: button::Status) -> button::Style {
+    let hovered = matches!(s, button::Status::Hovered);
+    let pressed = matches!(s, button::Status::Pressed);
+    button::Style {
+        background: Some(c(if pressed { 0x1B2029 } else if hovered { 0x181D26 } else { COL_SURFACE }).into()),
+        text_color: c(if pressed || hovered { COL_TEXT } else { 0xC6CCDA }),
+        border: border(c(if hovered { 0x39415A } else { COL_BORDER }), 1.0, 10.0),
+        ..Default::default()
+    }
+}
+
+fn btn_success(_t: &Theme, s: button::Status) -> button::Style {
+    let bg = match s {
+        button::Status::Active => c(COL_GREEN),
+        button::Status::Hovered => c(0x3BF5A7),
+        button::Status::Pressed => c(0x0ED183),
+        button::Status::Disabled => c(0x143328),
+    };
+    let txt = if matches!(s, button::Status::Disabled) { c(0x4E7A66) } else { c(0x05130C) };
+    button::Style {
+        background: Some(bg.into()),
+        text_color: txt,
+        border: border(c(COL_GREEN), 0.0, 10.0),
+        ..Default::default()
+    }
+}
+
+fn btn_danger(_t: &Theme, s: button::Status) -> button::Style {
+    let bg = match s {
+        button::Status::Active => c(COL_RED),
+        button::Status::Hovered => c(0xF2555A),
+        button::Status::Pressed => c(0xC93B40),
+        button::Status::Disabled => c(0x33191B),
+    };
+    let txt = if matches!(s, button::Status::Disabled) { c(0x8A5558) } else { c(0xFFFFFF) };
+    button::Style {
+        background: Some(bg.into()),
+        text_color: txt,
+        border: border(c(COL_RED), 0.0, 10.0),
+        ..Default::default()
+    }
+}
+
+fn btn_text(_t: &Theme, s: button::Status) -> button::Style {
+    button::Style {
+        background: None,
+        text_color: c(match s {
+            button::Status::Hovered | button::Status::Pressed => COL_TEXT,
+            button::Status::Disabled => 0x5A6070,
+            _ => COL_MUTED,
+        }),
+        border: border(Color::TRANSPARENT, 0.0, 8.0),
+        ..Default::default()
+    }
+}
+
+fn card_style(_theme: &Theme) -> container::Style {
+    container::Style {
+        background: Some(c(COL_SURFACE).into()),
+        border: border(c(COL_BORDER), 1.0, 14.0),
+        ..Default::default()
+    }
+}
+
+fn input_style(_t: &Theme, s: text_input::Status) -> text_input::Style {
+    let bd = match s {
+        text_input::Status::Focused { .. } => border(c(COL_ACCENT), 1.4, 10.0),
+        text_input::Status::Hovered => border(c(0x333B50), 1.0, 10.0),
+        _ => border(c(COL_BORDER), 1.0, 10.0),
+    };
+    text_input::Style {
+        background: c(COL_FIELD).into(),
+        border: bd,
+        icon: c(COL_MUTED),
+        placeholder: c(0x5F6779),
+        value: c(COL_TEXT),
+        selection: Color::from_rgba(0.60, 0.27, 1.0, 0.35),
+    }
+}
+
+fn scroll_style(_t: &Theme, _s: scrollable::Status) -> scrollable::Style {
+    let rail = |scroller: Color| scrollable::Rail {
+        background: None,
+        border: border(Color::TRANSPARENT, 0.0, 4.0),
+        scroller: scrollable::Scroller {
+            background: scroller.into(),
+            border: border(Color::TRANSPARENT, 0.0, 4.0),
+        },
+    };
+    scrollable::Style {
+        container: container::Style::default(),
+        vertical_rail: rail(c(0x2B3242)),
+        horizontal_rail: rail(c(0x2B3242)),
+        gap: None,
+        auto_scroll: scrollable::AutoScroll {
+            background: c(0x1B2029).into(),
+            border: border(c(COL_BORDER), 1.0, 8.0),
+            shadow: iced::Shadow::default(),
+            icon: c(COL_TEXT),
+        },
+    }
+}
+
+fn checkbox_style(_t: &Theme, s: checkbox::Status) -> checkbox::Style {
+    let checked = match s {
+        checkbox::Status::Active { is_checked } => is_checked,
+        checkbox::Status::Hovered { is_checked } => is_checked,
+        checkbox::Status::Disabled { is_checked } => is_checked,
+    };
+    let hovered = matches!(s, checkbox::Status::Hovered { .. });
+    checkbox::Style {
+        background: c(if checked { COL_ACCENT } else { COL_FIELD }).into(),
+        icon_color: c(0xFFFFFF),
+        border: border(
+            c(if checked { COL_ACCENT } else if hovered { 0x39415A } else { COL_BORDER }),
+            1.2,
+            6.0,
+        ),
+        text_color: None,
+    }
+}
+
+fn label_color() -> Color {
+    c(COL_MUTED)
+}
+
+fn error_color() -> Color {
+    c(COL_RED)
+}
+
+fn view_history<'a>(state: &'a App) -> Element<'a, Message> {
+    let s = state.session.as_ref().expect("view_history without session");
+    let items = s.inbox.history();
+    if items.is_empty() {
+        return Container::new(
+            text("No requests yet.").size(13).color(c(0x6B7280)),
+        )
+        .width(Length::Fill)
+        .padding(14)
+        .style(|_t| container::Style {
+            background: Some(c(COL_SURFACE).into()),
+            border: border(c(COL_BORDER), 1.0, 10.0),
+            ..Default::default()
+        })
+        .into();
+    }
+    let now = now_secs();
+    let rows: Vec<Element<Message>> = items
+        .iter()
+        .map(|h| {
+            let sender_addr = h.sender.to_string();
+
+            Row::with_children(vec![
+                dot(outcome_dot(h.outcome)),
+                Space::new().width(10).into(),
+                Column::with_children(vec![
+                    Row::with_children(vec![
+                        text(h.action.clone()).size(13).color(c(COL_TEXT)).into(),
+                        text(format!("  ·  {}", outcome_label(h.outcome)))
+                            .size(11)
+                            .color(outcome_color(h.outcome))
+                            .into(),
+                    ])
+                    .align_y(alignment::Vertical::Center)
+                    .into(),
+                    Row::with_children({
+                        let mut ch: Vec<Element<Message>> =
+                            vec![text("from").size(11).color(c(0x6B7280)).into()];
+                        ch.push(Space::new().width(3).into());
+                        ch.extend(addr_line(&state.book, sender_addr, 11.0));
+                        ch
+                    })
+                    .align_y(alignment::Vertical::Center)
+                    .into(),
+                ])
+                .spacing(2)
+                .width(Length::Fill)
+                .into(),
+                Space::new().width(8).into(),
+                text(rel_time(now.saturating_sub(h.created_at)))
+                    .size(11)
+                    .color(c(0x6B7280))
+                    .into(),
+            ])
+            .align_y(alignment::Vertical::Center)
+            .into()
+        })
+        .map(|row: Element<Message>| {
+            Container::new(row)
+                .width(Length::Fill)
+                .padding([10, 12])
+                .style(|_t| container::Style {
+                    background: Some(c(COL_SURFACE).into()),
+                    border: border(c(COL_BORDER), 1.0, 10.0),
+                    ..Default::default()
+                })
+                .into()
+        })
+        .collect();
+    Column::with_children(rows).spacing(6).into()
+}
+
+/// Dot color per outcome (slightly deeper than the label colors for contrast).
+fn outcome_dot(o: Outcome) -> u32 {
+    match o {
+        Outcome::Pending => COL_AMBER,
+        Outcome::Approved => COL_GREEN,
+        Outcome::Denied => COL_RED,
+        Outcome::TimedOut | Outcome::Stale => 0x4B5263,
+    }
+}
+
+// ---------------------------------------------------------------- helpers
+
+fn now_secs() -> u64 {
+    std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .map(|d| d.as_secs())
+        .unwrap_or(0)
+}
+
+/// `seconds` as a compact human duration: "42s", "5m 3s", "2h 7m".
+fn rel_time(secs: u64) -> String {
+    if secs < 60 {
+        format!("{secs}s")
+    } else if secs < 3600 {
+        format!("{}m {}s", secs / 60, secs % 60)
+    } else {
+        format!("{}h {}m", secs / 3600, (secs % 3600) / 60)
+    }
+}
+
+fn expires_in(p: &Prompt) -> String {
+    let now = now_secs();
+    if p.req.request.expires_at > now {
+        format!("expires in {}", rel_time(p.req.request.expires_at - now))
+    } else {
+        "expired".to_string()
+    }
+}
+
+fn outcome_color(o: Outcome) -> Color {
+    match o {
+        Outcome::Pending => c(COL_AMBER),
+        Outcome::Approved => c(COL_GREEN),
+        Outcome::Denied => c(COL_RED),
+        Outcome::TimedOut | Outcome::Stale => c(0x6B7280),
+    }
+}
+} // mod gui
+
+fn main() {
+    #[cfg(feature = "gui")]
+    gui::run().unwrap_or_else(|e| {
+        eprintln!("niko-trust-gui: {e}");
+        std::process::exit(1);
+    });
+    #[cfg(not(feature = "gui"))]
+    {
+        eprintln!("niko-trust-gui: built without the \"gui\" feature");
+        std::process::exit(1);
+    }
+}
diff --git a/src/notify.rs b/src/notify.rs
new file mode 100644
index 0000000..a5fbb7d
--- /dev/null
+++ b/src/notify.rs
@@ -0,0 +1,119 @@
+//! Notifications: show an approval request with Approve / Deny buttons.
+//!
+//! The notification is fire-and-forget from the UI's point of view (it runs on
+//! its own thread); the user's decision arrives on a channel. If the backend
+//! cannot show interactive notifications (or the user dismisses), the caller
+//! falls back to an in-app prompt.
+
+use std::sync::mpsc;
+use std::time::Duration;
+
+use crate::protocol::Decision;
+
+/// A native notification with exactly two actions.
+pub struct ApprovalNotification {
+    /// Sender address, shown as the source line.
+    pub sender: String,
+    /// Request action (opaque).
+    pub action: String,
+    /// Human-readable message.
+    pub message: String,
+}
+
+/// Outcome of a user interacting with a notification.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum PromptOutcome {
+    /// The user hit Approve.
+    Approved,
+    /// The user hit Deny.
+    Denied,
+    /// The notification was dismissed or the backend has no interactivity.
+    Ignored,
+}
+
+/// Result of showing one notification.
+pub struct PromptHandle {
+    rx: mpsc::Receiver<PromptOutcome>,
+}
+
+impl PromptHandle {
+    /// Blocks until the user answers. Returns immediately if the backend
+    /// reported no interactivity (the handle then yields `Ignored`).
+    pub fn wait(self) -> PromptOutcome {
+        self.rx.recv().unwrap_or(PromptOutcome::Ignored)
+    }
+
+    /// Waits up to `timeout` for an answer; `Ignored` if the user is slow.
+    pub fn wait_timeout(self, timeout: Duration) -> PromptOutcome {
+        self.rx
+            .recv_timeout(timeout)
+            .unwrap_or(PromptOutcome::Ignored)
+    }
+}
+
+/// Whether this platform can raise interactive notifications.
+#[cfg(target_os = "linux")]
+pub fn interactive_supported() -> bool {
+    notify_rust::dbus_stack().is_some()
+}
+
+/// Windows/toast support is not wired yet; the in-app prompt covers it.
+#[cfg(not(target_os = "linux"))]
+pub fn interactive_supported() -> bool {
+    false
+}
+
+/// Shows the notification and returns a handle to its outcome.
+///
+/// The "not interactive" case still shows a plain, non-interactive toast so
+/// the user at least sees the request, and returns a handle that yields
+/// `Ignored` immediately.
+#[cfg(target_os = "linux")]
+pub fn show(n: ApprovalNotification) -> PromptHandle {
+    let (tx, rx) = mpsc::channel();
+    let mut notif = notify_rust::Notification::new();
+    notif.summary(&format!("Approval requested: {}", n.action));
+    notif.body(&format!("{}\nfrom: {}", n.message, n.sender));
+    notif.appname("niko-trust");
+    notif.action("approve", "Approve");
+    notif.action("deny", "Deny");
+
+    let handle = notif.show();
+    match handle {
+        Ok(h) => {
+            std::thread::spawn(move || {
+                h.wait_for_action(|a| {
+                    let _ = tx.send(match a {
+                        "approve" => PromptOutcome::Approved,
+                        "deny" => PromptOutcome::Denied,
+                        _ => PromptOutcome::Ignored,
+                    });
+                });
+            });
+        }
+        Err(_) => {
+            // Backend down / non-interactive: what we showed (if anything)
+            // cannot answer. Report Ignored so the UI shows its own dialog.
+            let _ = tx.send(PromptOutcome::Ignored);
+        }
+    }
+    PromptHandle { rx }
+}
+
+/// Placeholder backend: no native toast outside Linux yet, so report `Ignored`
+/// right away — the GUI falls back to its in-app prompt card.
+#[cfg(not(target_os = "linux"))]
+pub fn show(_n: ApprovalNotification) -> PromptHandle {
+    let (tx, rx) = mpsc::channel();
+    let _ = tx.send(PromptOutcome::Ignored);
+    PromptHandle { rx }
+}
+
+/// Maps a prompt outcome to a protocol decision, if the user chose one.
+pub fn to_decision(o: PromptOutcome) -> Option<Decision> {
+    match o {
+        PromptOutcome::Approved => Some(Decision::Allow),
+        PromptOutcome::Denied => Some(Decision::Deny),
+        PromptOutcome::Ignored => None,
+    }
+}
\ No newline at end of file
diff --git a/src/protocol.rs b/src/protocol.rs
new file mode 100644
index 0000000..e4efe26
--- /dev/null
+++ b/src/protocol.rs
@@ -0,0 +1,402 @@
+//! Protocol objects: field order and rules for the six signed object types.
+//! Field order here is exactly the order in PROTOCOL.md section 8 and matches
+//! the Go reference (internal/protocol).
+
+use std::collections::BTreeMap;
+
+use crate::address::{validate_pubkey, AddressError};
+use crate::crypto::sha256;
+use crate::tce::decode::Decoder;
+use crate::tce::encode::Encoder;
+use crate::tce::value::Value;
+use crate::tce::TceError;
+
+pub const MAX_CLOCK_SKEW: u64 = 120;
+
+pub use crate::tce::{
+    MAX_ACTION_LEN, MAX_ALIAS_LEN, MAX_AUDIENCE_LEN, MAX_AUTH_TCE, MAX_CLAIM_TCE, MAX_IDENTITY_TCE,
+    MAX_MESSAGE_LEN, MAX_REASON_LEN, MAX_REQUEST_TCE, MAX_RESPONSE_TCE, MAX_REVOC_TCE,
+    MAX_SCOPE_LEN,
+};
+
+fn validate_identity(pubkey: &[u8; 32]) -> Result<(), AddressError> {
+    validate_pubkey(pubkey)
+}
+
+fn check_end(d: &Decoder) -> Result<(), TceError> {
+    d.end()
+}
+
+// ---------------------------------------------------------------------------
+// IdentityRegistration (0x01)
+// ---------------------------------------------------------------------------
+
+#[derive(Debug, Clone, Default, PartialEq)]
+pub struct Identity {
+    pub pubkey: [u8; crate::tce::PUBKEY_SIZE],
+    pub alias: String,
+    pub created_at: u64,
+}
+
+pub fn encode_identity(o: &Identity) -> Result<Vec<u8>, TceError> {
+    validate_identity(&o.pubkey).map_err(|_| TceError::Protocol("identity: invalid key".into()))?;
+    let mut e = Encoder::new();
+    e.header(crate::tce::TAG_IDENTITY);
+    e.identity(&o.pubkey);
+    e.string(&o.alias, MAX_ALIAS_LEN);
+    e.timestamp(o.created_at, false);
+    e.check_size(MAX_IDENTITY_TCE);
+    e.bytes()
+}
+
+pub fn decode_identity(b: &[u8]) -> Result<Identity, TceError> {
+    if b.len() > MAX_IDENTITY_TCE {
+        return Err(TceError::ObjectTooLarge);
+    }
+    let mut d = Decoder::new(b);
+    let tag = d.header()?;
+    if tag != crate::tce::TAG_IDENTITY {
+        return Err(TceError::WrongObject);
+    }
+    let pk = d.identity()?;
+    validate_identity(&pk).map_err(|_| TceError::Protocol("identity: invalid key".into()))?;
+    let alias = d.string(MAX_ALIAS_LEN)?;
+    let created_at = d.timestamp(false)?;
+    check_end(&d)?;
+    Ok(Identity { pubkey: pk, alias, created_at })
+}
+
+// ---------------------------------------------------------------------------
+// Claim (0x02)
+// ---------------------------------------------------------------------------
+
+#[derive(Debug, Clone, Default, PartialEq)]
+pub struct Claim {
+    pub issuer: [u8; crate::tce::PUBKEY_SIZE],
+    pub subject: [u8; crate::tce::PUBKEY_SIZE],
+    pub claims: BTreeMap<String, Value>,
+    pub created_at: u64,
+    pub expires_at: u64,
+    pub serial: u64,
+    pub nonce: [u8; crate::tce::NONCE_SIZE],
+}
+
+pub fn encode_claim(o: &Claim) -> Result<Vec<u8>, TceError> {
+    validate_identity(&o.issuer).map_err(|_| TceError::Protocol("claim: issuer".into()))?;
+    validate_identity(&o.subject).map_err(|_| TceError::Protocol("claim: subject".into()))?;
+    if o.nonce.len() != crate::tce::NONCE_SIZE {
+        return Err(TceError::FieldSize);
+    }
+    if o.expires_at != 0 && o.expires_at <= o.created_at {
+        return Err(TceError::Expiry);
+    }
+    let mut e = Encoder::new();
+    e.header(crate::tce::TAG_CLAIM);
+    e.identity(&o.issuer);
+    e.identity(&o.subject);
+    e.map(&o.claims, 1);
+    e.timestamp(o.created_at, false);
+    e.timestamp(o.expires_at, true);
+    e.uvarint(o.serial);
+    e.fixed_bytes(&o.nonce, crate::tce::NONCE_SIZE);
+    e.check_size(MAX_CLAIM_TCE);
+    e.bytes()
+}
+
+pub fn decode_claim(b: &[u8]) -> Result<Claim, TceError> {
+    if b.len() > MAX_CLAIM_TCE {
+        return Err(TceError::ObjectTooLarge);
+    }
+    let mut d = Decoder::new(b);
+    let tag = d.header()?;
+    if tag != crate::tce::TAG_CLAIM {
+        return Err(TceError::WrongObject);
+    }
+    let issuer = d.identity()?;
+    validate_identity(&issuer).map_err(|_| TceError::Protocol("claim: issuer".into()))?;
+    let subject = d.identity()?;
+    validate_identity(&subject).map_err(|_| TceError::Protocol("claim: subject".into()))?;
+    let claims = d.map(1)?;
+    let created_at = d.timestamp(false)?;
+    let expires_at = d.timestamp(true)?;
+    if expires_at != 0 && expires_at <= created_at {
+        return Err(TceError::Expiry);
+    }
+    let serial = d.uvarint()?;
+    let nonce_b = d.fixed_bytes(crate::tce::NONCE_SIZE)?;
+    check_end(&d)?;
+    let mut nonce = [0u8; crate::tce::NONCE_SIZE];
+    nonce.copy_from_slice(nonce_b);
+    Ok(Claim { issuer, subject, claims, created_at, expires_at, serial, nonce })
+}
+
+// ---------------------------------------------------------------------------
+// Revocation (0x03)
+// ---------------------------------------------------------------------------
+
+#[derive(Debug, Clone, Default, PartialEq)]
+pub struct Revocation {
+    pub issuer: [u8; crate::tce::PUBKEY_SIZE],
+    pub claim_id: [u8; crate::tce::HASH_SIZE],
+    pub reason: String,
+    pub created_at: u64,
+    pub nonce: [u8; crate::tce::NONCE_SIZE],
+}
+
+pub fn encode_revocation(o: &Revocation) -> Result<Vec<u8>, TceError> {
+    validate_identity(&o.issuer).map_err(|_| TceError::Protocol("revocation: issuer".into()))?;
+    if o.nonce.len() != crate::tce::NONCE_SIZE {
+        return Err(TceError::FieldSize);
+    }
+    let mut e = Encoder::new();
+    e.header(crate::tce::TAG_REVOCATION);
+    e.identity(&o.issuer);
+    e.fixed_bytes(&o.claim_id, crate::tce::HASH_SIZE);
+    e.string(&o.reason, MAX_REASON_LEN);
+    e.timestamp(o.created_at, false);
+    e.fixed_bytes(&o.nonce, crate::tce::NONCE_SIZE);
+    e.check_size(MAX_REVOC_TCE);
+    e.bytes()
+}
+
+pub fn decode_revocation(b: &[u8]) -> Result<Revocation, TceError> {
+    if b.len() > MAX_REVOC_TCE {
+        return Err(TceError::ObjectTooLarge);
+    }
+    let mut d = Decoder::new(b);
+    let tag = d.header()?;
+    if tag != crate::tce::TAG_REVOCATION {
+        return Err(TceError::WrongObject);
+    }
+    let issuer = d.identity()?;
+    validate_identity(&issuer).map_err(|_| TceError::Protocol("revocation: issuer".into()))?;
+    let claim_b = d.fixed_bytes(crate::tce::HASH_SIZE)?;
+    let mut claim_id = [0u8; crate::tce::HASH_SIZE];
+    claim_id.copy_from_slice(claim_b);
+    let reason = d.string(MAX_REASON_LEN)?;
+    let created_at = d.timestamp(false)?;
+    let nonce_b = d.fixed_bytes(crate::tce::NONCE_SIZE)?;
+    check_end(&d)?;
+    let mut nonce = [0u8; crate::tce::NONCE_SIZE];
+    nonce.copy_from_slice(nonce_b);
+    Ok(Revocation { issuer, claim_id, reason, created_at, nonce })
+}
+
+// ---------------------------------------------------------------------------
+// ApprovalRequest (0x04)
+// ---------------------------------------------------------------------------
+
+#[derive(Debug, Clone, Default, PartialEq)]
+pub struct ApprovalRequest {
+    pub sender: [u8; crate::tce::PUBKEY_SIZE],
+    pub recipient: [u8; crate::tce::PUBKEY_SIZE],
+    pub action: String,
+    pub payload: BTreeMap<String, Value>,
+    pub message: String,
+    pub created_at: u64,
+    pub expires_at: u64,
+    pub nonce: [u8; crate::tce::NONCE_SIZE],
+}
+
+impl ApprovalRequest {
+    /// Lowercase-hex request id over the exact request bytes.
+    pub fn request_id(&self, tce: &[u8]) -> String {
+        hex::encode(sha256(tce))
+    }
+}
+
+pub fn encode_approval_request(o: &ApprovalRequest) -> Result<Vec<u8>, TceError> {
+    validate_identity(&o.sender).map_err(|_| TceError::Protocol("request: sender".into()))?;
+    validate_identity(&o.recipient).map_err(|_| TceError::Protocol("request: recipient".into()))?;
+    if o.nonce.len() != crate::tce::NONCE_SIZE {
+        return Err(TceError::FieldSize);
+    }
+    if o.expires_at <= o.created_at {
+        return Err(TceError::Expiry);
+    }
+    if o.expires_at - o.created_at > crate::tce::MAX_APPROVAL_LIFETIME {
+        return Err(TceError::Lifetime);
+    }
+    let mut e = Encoder::new();
+    e.header(crate::tce::TAG_APPROVAL_REQUEST);
+    e.identity(&o.sender);
+    e.identity(&o.recipient);
+    e.string(&o.action, MAX_ACTION_LEN);
+    e.map(&o.payload, 0);
+    e.string(&o.message, MAX_MESSAGE_LEN);
+    e.timestamp(o.created_at, false);
+    e.timestamp(o.expires_at, false);
+    e.fixed_bytes(&o.nonce, crate::tce::NONCE_SIZE);
+    e.check_size(MAX_REQUEST_TCE);
+    e.bytes()
+}
+
+pub fn decode_approval_request(b: &[u8]) -> Result<ApprovalRequest, TceError> {
+    if b.len() > MAX_REQUEST_TCE {
+        return Err(TceError::ObjectTooLarge);
+    }
+    let mut d = Decoder::new(b);
+    let tag = d.header()?;
+    if tag != crate::tce::TAG_APPROVAL_REQUEST {
+        return Err(TceError::WrongObject);
+    }
+    let sender = d.identity()?;
+    validate_identity(&sender).map_err(|_| TceError::Protocol("request: sender".into()))?;
+    let recipient = d.identity()?;
+    validate_identity(&recipient).map_err(|_| TceError::Protocol("request: recipient".into()))?;
+    let action = d.string(MAX_ACTION_LEN)?;
+    let payload = d.map(0)?;
+    let message = d.string(MAX_MESSAGE_LEN)?;
+    let created_at = d.timestamp(false)?;
+    let expires_at = d.timestamp(false)?;
+    if expires_at <= created_at {
+        return Err(TceError::Expiry);
+    }
+    if expires_at - created_at > crate::tce::MAX_APPROVAL_LIFETIME {
+        return Err(TceError::Lifetime);
+    }
+    let nonce_b = d.fixed_bytes(crate::tce::NONCE_SIZE)?;
+    check_end(&d)?;
+    let mut nonce = [0u8; crate::tce::NONCE_SIZE];
+    nonce.copy_from_slice(nonce_b);
+    Ok(ApprovalRequest { sender, recipient, action, payload, message, created_at, expires_at, nonce })
+}
+
+// ---------------------------------------------------------------------------
+// ApprovalResponse (0x05)
+// ---------------------------------------------------------------------------
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub enum Decision {
+    #[default]
+    Deny,
+    Allow,
+}
+
+impl Decision {
+    pub fn from_u64(v: u64) -> Option<Decision> {
+        match v {
+            crate::tce::DECISION_DENY => Some(Decision::Deny),
+            crate::tce::DECISION_ALLOW => Some(Decision::Allow),
+            _ => None,
+        }
+    }
+    pub fn as_u64(&self) -> u64 {
+        match self {
+            Decision::Deny => crate::tce::DECISION_DENY,
+            Decision::Allow => crate::tce::DECISION_ALLOW,
+        }
+    }
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            Decision::Allow => "allow",
+            Decision::Deny => "deny",
+        }
+    }
+}
+
+#[derive(Debug, Clone, Default, PartialEq)]
+pub struct ApprovalResponse {
+    pub request_hash: [u8; crate::tce::HASH_SIZE],
+    pub responder: [u8; crate::tce::PUBKEY_SIZE],
+    pub decision: Decision,
+    pub created_at: u64,
+    pub nonce: [u8; crate::tce::NONCE_SIZE],
+}
+
+pub fn encode_approval_response(o: &ApprovalResponse) -> Result<Vec<u8>, TceError> {
+    if !matches!(o.decision, Decision::Deny | Decision::Allow) {
+        return Err(TceError::Decision);
+    }
+    validate_identity(&o.responder).map_err(|_| TceError::Protocol("response: responder".into()))?;
+    if o.nonce.len() != crate::tce::NONCE_SIZE {
+        return Err(TceError::FieldSize);
+    }
+    let mut e = Encoder::new();
+    e.header(crate::tce::TAG_APPROVAL_RESPONSE);
+    e.fixed_bytes(&o.request_hash, crate::tce::HASH_SIZE);
+    e.identity(&o.responder);
+    e.uvarint(o.decision.as_u64());
+    e.timestamp(o.created_at, false);
+    e.fixed_bytes(&o.nonce, crate::tce::NONCE_SIZE);
+    e.check_size(MAX_RESPONSE_TCE);
+    e.bytes()
+}
+
+pub fn decode_approval_response(b: &[u8]) -> Result<ApprovalResponse, TceError> {
+    if b.len() > MAX_RESPONSE_TCE {
+        return Err(TceError::ObjectTooLarge);
+    }
+    let mut d = Decoder::new(b);
+    let tag = d.header()?;
+    if tag != crate::tce::TAG_APPROVAL_RESPONSE {
+        return Err(TceError::WrongObject);
+    }
+    let hash_b = d.fixed_bytes(crate::tce::HASH_SIZE)?;
+    let mut request_hash = [0u8; crate::tce::HASH_SIZE];
+    request_hash.copy_from_slice(hash_b);
+    let responder = d.identity()?;
+    validate_identity(&responder).map_err(|_| TceError::Protocol("response: responder".into()))?;
+    let decision = Decision::from_u64(d.uvarint()?).ok_or(TceError::Decision)?;
+    let created_at = d.timestamp(false)?;
+    let nonce_b = d.fixed_bytes(crate::tce::NONCE_SIZE)?;
+    check_end(&d)?;
+    let mut nonce = [0u8; crate::tce::NONCE_SIZE];
+    nonce.copy_from_slice(nonce_b);
+    Ok(ApprovalResponse { request_hash, responder, decision, created_at, nonce })
+}
+
+// ---------------------------------------------------------------------------
+// AuthAssertion (0x06)
+// ---------------------------------------------------------------------------
+
+#[derive(Debug, Clone, Default, PartialEq)]
+pub struct AuthAssertion {
+    pub pubkey: [u8; crate::tce::PUBKEY_SIZE],
+    pub challenge: [u8; crate::tce::CHALLENGE_SIZE],
+    pub scope: String,
+    pub audience: String,
+    pub created_at: u64,
+}
+
+pub fn encode_auth_assertion(o: &AuthAssertion) -> Result<Vec<u8>, TceError> {
+    validate_identity(&o.pubkey).map_err(|_| TceError::Protocol("auth: identity".into()))?;
+    if o.challenge.len() != crate::tce::CHALLENGE_SIZE {
+        return Err(TceError::FieldSize);
+    }
+    let mut e = Encoder::new();
+    e.header(crate::tce::TAG_AUTH_ASSERTION);
+    e.identity(&o.pubkey);
+    e.fixed_bytes(&o.challenge, crate::tce::CHALLENGE_SIZE);
+    e.string(&o.scope, MAX_SCOPE_LEN);
+    e.string(&o.audience, MAX_AUDIENCE_LEN);
+    e.timestamp(o.created_at, false);
+    e.check_size(MAX_AUTH_TCE);
+    e.bytes()
+}
+
+pub fn decode_auth_assertion(b: &[u8]) -> Result<AuthAssertion, TceError> {
+    if b.len() > MAX_AUTH_TCE {
+        return Err(TceError::ObjectTooLarge);
+    }
+    let mut d = Decoder::new(b);
+    let tag = d.header()?;
+    if tag != crate::tce::TAG_AUTH_ASSERTION {
+        return Err(TceError::WrongObject);
+    }
+    let pubkey = d.identity()?;
+    validate_identity(&pubkey).map_err(|_| TceError::Protocol("auth: identity".into()))?;
+    let chal_b = d.fixed_bytes(crate::tce::CHALLENGE_SIZE)?;
+    let mut challenge = [0u8; crate::tce::CHALLENGE_SIZE];
+    challenge.copy_from_slice(chal_b);
+    let scope = d.string(MAX_SCOPE_LEN)?;
+    let audience = d.string(MAX_AUDIENCE_LEN)?;
+    let created_at = d.timestamp(false)?;
+    check_end(&d)?;
+    Ok(AuthAssertion { pubkey, challenge, scope, audience, created_at })
+}
+
+/// Lowercase-hex object id of TCE bytes.
+pub fn object_id_of(tce: &[u8]) -> String {
+    hex::encode(sha256(tce))
+}
\ No newline at end of file
diff --git a/src/relay.rs b/src/relay.rs
new file mode 100644
index 0000000..30ac876
--- /dev/null
+++ b/src/relay.rs
@@ -0,0 +1,442 @@
+//! Relay client: the AuthAssertion handshake, reading an approval inbox and
+//! submitting ApprovalResponses over the JSON transport (docs/API.md).
+//!
+//! The server never verifies signatures on ingest (`POST /v1/objects` stores
+//! any well-formed envelope), so every object this module *reads* is strictly
+//! decoded and verified locally before it is shown to the user. Nothing here
+//! ever re-encodes the `object` JSON view and verifies that; the verified
+//! bytes are the received `tce` bytes.
+
+use std::time::{SystemTime, UNIX_EPOCH};
+
+use base64::Engine as _;
+use ureq::Body;
+
+use crate::address::{validate_pubkey, Address};
+use crate::protocol::{
+    decode_approval_request, decode_approval_response, encode_approval_response, object_id_of,
+    ApprovalRequest, ApprovalResponse, AuthAssertion, Decision,
+};
+use crate::signer::{verify, Signer};
+use crate::tce::{CHALLENGE_SIZE, NONCE_SIZE};
+
+#[derive(Debug)]
+pub enum RelayError {
+    /// Transport or HTTP-level failure (connection, timeout, bad status).
+    Http(String),
+    /// The relay returned an unexpected shape (missing field, bad base64...).
+    Malformed(String),
+    /// An incoming object failed strict verification.
+    Verify(String),
+    /// Local signing/encoding error.
+    Build(String),
+}
+
+impl std::fmt::Display for RelayError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            RelayError::Http(m) => write!(f, "relay http: {m}"),
+            RelayError::Malformed(m) => write!(f, "relay malformed: {m}"),
+            RelayError::Verify(m) => write!(f, "relay verify: {m}"),
+            RelayError::Build(m) => write!(f, "relay build: {m}"),
+        }
+    }
+}
+
+impl std::error::Error for RelayError {}
+
+fn now_secs() -> u64 {
+    SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .map(|d| d.as_secs())
+        .unwrap_or(0)
+}
+
+fn b64_encode(b: &[u8]) -> String {
+    base64::engine::general_purpose::STANDARD.encode(b)
+}
+
+fn b64_decode(s: &str) -> Result<Vec<u8>, RelayError> {
+    base64::engine::general_purpose::STANDARD
+        .decode(s)
+        .map_err(|e| RelayError::Malformed(format!("base64: {e}")))
+}
+
+fn agent() -> ureq::Agent {
+    ureq::Agent::new_with_config(
+        ureq::config::Config::builder().http_status_as_error(false).build(),
+    )
+}
+
+/// Body read helpers: ureq 3 returns `http::Response<Body>`; the body APIs
+/// borrow (`&mut self`), so both helpers take the response by value, split it,
+/// and return it for chained status handling.
+fn body_text(body: &mut Body) -> String {
+    body.read_to_string().unwrap_or_default()
+}
+
+fn body_json<T: serde::de::DeserializeOwned>(body: &mut Body) -> Result<T, RelayError> {
+    body.read_json::<T>().map_err(|e| RelayError::Malformed(format!("json: {e}")))
+}
+
+/// One signed object as carried by the wire (envelope).
+#[derive(Debug, Clone)]
+pub struct Envelope {
+    pub tce: Vec<u8>,
+    pub signature: [u8; 64],
+}
+
+/// A verified, ready-to-show approval request.
+#[derive(Debug, Clone)]
+pub struct IncomingRequest {
+    pub request: ApprovalRequest,
+    /// The exact request TCE bytes as received. A response must hash *these*
+    /// bytes (re-encoding the decoded struct is not byte-exact).
+    pub tce: Vec<u8>,
+    /// request_id = SHA-256(exact request tce), the `request_hash` to answer.
+    pub request_id: [u8; 32],
+    /// Sender address, for display next to the message.
+    pub sender: Address,
+}
+
+/// A verified approval response, as read by the requesting service.
+#[derive(Debug, Clone)]
+pub struct IncomingResponse {
+    pub response: ApprovalResponse,
+    /// The exact response TCE bytes as received.
+    pub tce: Vec<u8>,
+    /// Responder address, for display.
+    pub responder: Address,
+}
+
+fn parse_envelope(v: &serde_json::Value) -> Result<Envelope, RelayError> {
+    let tce = b64_decode(
+        v.get("tce")
+            .and_then(|x| x.as_str())
+            .ok_or_else(|| RelayError::Malformed("missing tce".into()))?,
+    )?;
+    let sig_b = b64_decode(
+        v.get("signature")
+            .and_then(|x| x.as_str())
+            .ok_or_else(|| RelayError::Malformed("missing signature".into()))?,
+    )?;
+    let signature: [u8; 64] = sig_b
+        .try_into()
+        .map_err(|_| RelayError::Malformed("signature not 64 bytes".into()))?;
+    Ok(Envelope { tce, signature })
+}
+
+/// Responder + signature verification for one listed response envelope.
+fn verify_incoming_response(item: &serde_json::Value) -> Result<IncomingResponse, RelayError> {
+    let e = parse_envelope(item)?;
+    let response = decode_approval_response(&e.tce)
+        .map_err(|err| RelayError::Verify(format!("decode: {err}")))?;
+
+    validate_pubkey(&response.responder)
+        .map_err(|err| RelayError::Verify(format!("responder key: {err}")))?;
+    verify(&response.responder, &e.tce, &e.signature)
+        .map_err(|err| RelayError::Verify(format!("signature: {err}")))?;
+
+    let responder = Address::from_pubkey(&response.responder)
+        .map_err(|err| RelayError::Verify(format!("responder address: {err}")))?;
+
+    Ok(IncomingResponse { response, tce: e.tce, responder })
+}
+
+/// Client for one relay endpoint.
+pub struct Relay {
+    base: String,
+    agent: ureq::Agent,
+    audience: String,
+    token: String,
+}
+
+#[derive(serde::Deserialize)]
+struct AssertResponse {
+    session_token: String,
+}
+
+#[derive(serde::Deserialize)]
+struct ChallengeResponse {
+    challenge: String,
+}
+
+#[allow(clippy::needless_pass_by_value)]
+fn build_auth_assertion(
+    signer: &Signer,
+    challenge: &[u8; CHALLENGE_SIZE],
+    audience: &str,
+    scope: &str,
+) -> Result<(Vec<u8>, [u8; 64]), RelayError> {
+    let now = now_secs();
+    let a = AuthAssertion {
+        pubkey: signer.pubkey(),
+        challenge: *challenge,
+        scope: scope.to_string(),
+        audience: audience.to_string(),
+        created_at: now,
+    };
+    let tce = crate::protocol::encode_auth_assertion(&a)
+        .map_err(|e| RelayError::Build(format!("encode auth: {e}")))?;
+    let sig = signer.sign(&tce);
+    Ok((tce, sig))
+}
+
+fn post_envelope(
+    agent: &ureq::Agent,
+    url: &str,
+    tce: &[u8],
+    sig: &[u8; 64],
+) -> Result<serde_json::Value, RelayError> {
+    let body = serde_json::json!({
+        "tce": b64_encode(tce),
+        "signature": b64_encode(sig),
+    });
+    let mut resp = agent
+        .post(url)
+        .send_json(body)
+        .map_err(|e| RelayError::Http(format!("{e}")))?;
+    let status = resp.status().as_u16();
+    if status != 200 {
+        let text = body_text(resp.body_mut());
+        return Err(RelayError::Http(format!("status {status}: {text}")));
+    }
+    body_json(resp.body_mut())
+}
+
+fn parse_client_err(raw: ureq::Error) -> RelayError {
+    RelayError::Http(raw.to_string())
+}
+
+impl Relay {
+    /// Fetches the server's audience and performs the challenge/assert
+    /// handshake, returning an authenticated client bound to `base`.
+    pub fn auth(base: &str, signer: &Signer, scope: &str) -> Result<Relay, RelayError> {
+        let base = base.trim_end_matches('/').to_string();
+        let agent = agent();
+
+        // 1. audience
+        let mut cfg = agent.get(format!("{base}/v1/config")).call().map_err(parse_client_err)?;
+        let audience = {
+            let v: serde_json::Value = body_json(cfg.body_mut())?;
+            v.get("audience")
+                .and_then(|x| x.as_str())
+                .ok_or_else(|| RelayError::Malformed("config: missing audience".into()))?
+                .to_string()
+        };
+        if audience.is_empty() {
+            return Err(RelayError::Malformed("config: empty audience".into()));
+        }
+
+        // 2. challenge
+        let mut chal = agent
+            .post(format!("{base}/v1/auth/challenge"))
+            .send_empty()
+            .map_err(parse_client_err)?;
+        let ch: ChallengeResponse = body_json(chal.body_mut())?;
+        let ch_b = hex::decode(&ch.challenge)
+            .map_err(|e| RelayError::Malformed(format!("challenge hex: {e}")))?;
+        let challenge: [u8; CHALLENGE_SIZE] = ch_b
+            .try_into()
+            .map_err(|_| RelayError::Malformed("challenge not 32 bytes".into()))?;
+
+        // 3. assert
+        let (a_tce, a_sig) = build_auth_assertion(signer, &challenge, &audience, scope)?;
+        let out = post_envelope(&agent, &format!("{base}/v1/auth/assert"), &a_tce, &a_sig)?;
+        let ar: AssertResponse = serde_json::from_value(out)
+            .map_err(|e| RelayError::Malformed(format!("assert json: {e}")))?;
+        if ar.session_token.is_empty() {
+            return Err(RelayError::Malformed("assert: empty session_token".into()));
+        }
+
+        Ok(Relay { base, agent, audience, token: ar.session_token })
+    }
+
+    pub fn audience(&self) -> &str {
+        &self.audience
+    }
+
+    /// The relay this client is bound to (trailing slash trimmed).
+    pub fn base_url(&self) -> &str {
+        &self.base
+    }
+
+    /// Fetches approval requests addressed to `signer`, strict-decodes and
+    /// verifies each, returning the ones that pass.
+    ///
+    /// A single poisoned envelope is skipped, not fatal: the relay can store
+    /// anything, so a client must never trust the feed blindly.
+    pub fn fetch_requests(&self, signer: &Signer) -> Result<Vec<IncomingRequest>, RelayError> {
+        let addr = signer
+            .address()
+            .map_err(|e| RelayError::Build(format!("address: {e}")))?;
+        let url = format!("{}/v1/requests?recipient={}", self.base, addr);
+        let mut resp = self
+            .agent
+            .get(&url)
+            .header("Authorization", format!("Bearer {}", self.token))
+            .call()
+            .map_err(parse_client_err)?;
+        let status = resp.status().as_u16();
+        if status != 200 {
+            let text = body_text(resp.body_mut());
+            return Err(RelayError::Http(format!("status {status}: {text}")));
+        }
+        let v: serde_json::Value = body_json(resp.body_mut())?;
+        let list = v
+            .get("requests")
+            .and_then(|x| x.as_array())
+            .ok_or_else(|| RelayError::Malformed("requests: missing list".into()))?;
+
+        let mut out = Vec::new();
+        for item in list {
+            match self.verify_incoming_request(signer, item) {
+                Ok(r) => out.push(r),
+                Err(e) => eprintln!("relay: skipping bad request envelope: {e}"),
+            }
+        }
+        Ok(out)
+    }
+
+    // Recipient + sender verification, then builds an IncomingRequest.
+    fn verify_incoming_request(
+        &self,
+        me: &Signer,
+        item: &serde_json::Value,
+    ) -> Result<IncomingRequest, RelayError> {
+        let e = parse_envelope(item)?;
+        let request = decode_approval_request(&e.tce)
+            .map_err(|e| RelayError::Verify(format!("decode: {e}")))?;
+
+        // The request must target my key (not just my address text).
+        if request.recipient != me.pubkey() {
+            return Err(RelayError::Verify("recipient mismatch".into()));
+        }
+        // Same verification steps as the reference verifier, in order.
+        validate_pubkey(&request.sender)
+            .map_err(|e| RelayError::Verify(format!("sender key: {e}")))?;
+        verify(&request.sender, &e.tce, &e.signature)
+            .map_err(|e| RelayError::Verify(format!("signature: {e}")))?;
+
+        let sender = Address::from_pubkey(&request.sender)
+            .map_err(|e| RelayError::Verify(format!("sender address: {e}")))?;
+
+        let request_id = object_hash(&e.tce);
+
+        Ok(IncomingRequest { request, tce: e.tce, request_id, sender })
+    }
+
+    /// Fetches ApprovalResponses for one request (by id hex), strict-decodes
+    /// and verifies each. This is the service side of the flow: after storing
+    /// a request, poll this until the recipient answers.
+    pub fn fetch_responses(&self, request_id_hex: &str) -> Result<Vec<IncomingResponse>, RelayError> {
+        let url = format!("{}/v1/responses?request={}", self.base, request_id_hex);
+        let mut resp = self
+            .agent
+            .get(&url)
+            .header("Authorization", format!("Bearer {}", self.token))
+            .call()
+            .map_err(parse_client_err)?;
+        let status = resp.status().as_u16();
+        if status != 200 {
+            let text = body_text(resp.body_mut());
+            return Err(RelayError::Http(format!("status {status}: {text}")));
+        }
+        let v: serde_json::Value = body_json(resp.body_mut())?;
+        let list = v
+            .get("responses")
+            .and_then(|x| x.as_array())
+            .ok_or_else(|| RelayError::Malformed("responses: missing list".into()))?;
+
+        let mut out = Vec::new();
+        for item in list {
+            match verify_incoming_response(item) {
+                Ok(r) => out.push(r),
+                Err(e) => eprintln!("relay: skipping bad response envelope: {e}"),
+            }
+        }
+        Ok(out)
+    }
+
+    /// Stores an arbitrary signed object, returning its object_id.
+    pub fn store(&self, tce: &[u8], sig: &[u8; 64]) -> Result<String, RelayError> {
+        let out = post_envelope(&self.agent, &format!("{}/v1/objects", self.base), tce, sig)?;
+        out.get("object_id")
+            .and_then(|x| x.as_str())
+            .map(|s| s.to_string())
+            .ok_or_else(|| RelayError::Malformed("objects: missing object_id".into()))
+    }
+
+    /// Builds, signs and submits an ApprovalResponse for `req`.
+    pub fn respond(
+        &self,
+        signer: &Signer,
+        req: &ApprovalRequest,
+        req_tce: &[u8],
+        decision: Decision,
+    ) -> Result<String, RelayError> {
+        let now = now_secs();
+        // §8.5.3: response.created_at must fall inside the request window with
+        // the ±120s clock-skew allowance of §13.1. A stale request is refused
+        // locally before we ever submit an answer.
+        if !response_in_window(req, now) {
+            return Err(RelayError::Build("request window has lapsed".into()));
+        }
+        let request_hash = object_hash(req_tce);
+        let mut nonce = [0u8; NONCE_SIZE];
+        getrandom::fill(&mut nonce).map_err(|e| RelayError::Build(format!("rng: {e}")))?;
+
+        let resp = ApprovalResponse {
+            request_hash,
+            responder: signer.pubkey(),
+            decision,
+            created_at: now,
+            nonce,
+        };
+        let tce = encode_approval_response(&resp)
+            .map_err(|e| RelayError::Build(format!("encode response: {e}")))?;
+        let sig = signer.sign(&tce);
+
+        let out = post_envelope(&self.agent, &format!("{}/v1/objects", self.base), &tce, &sig)?;
+        out.get("object_id")
+            .and_then(|x| x.as_str())
+            .map(|s| s.to_string())
+            .ok_or_else(|| RelayError::Malformed("objects: missing object_id".into()))
+    }
+}
+
+/// SHA-256 of the exact request TCE bytes (the `request_hash` field).
+pub fn object_hash(tce: &[u8]) -> [u8; 32] {
+    crate::crypto::sha256(tce)
+}
+
+/// PROTOCOL.md §8.5 check 3: `request.created_at - skew <= now <=
+/// request.expires_at + skew`, with the §13.1 allowance.
+fn response_in_window(req: &ApprovalRequest, now: u64) -> bool {
+    const SKEW: u64 = crate::protocol::MAX_CLOCK_SKEW;
+    if now < req.created_at {
+        req.created_at - now <= SKEW
+    } else if now > req.expires_at {
+        now - req.expires_at <= SKEW
+    } else {
+        true
+    }
+}
+
+/// Lowcase-hex object id, exposed for logging only; the request_hash compared
+/// at verify-time is the raw 32 bytes (INV-4).
+pub fn request_id_hex(tce: &[u8]) -> String {
+    object_id_of(tce)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn object_hash_is_sha256() {
+        let data = b"trust.n1ko.dev/tce/1\x00";
+        let want = crate::crypto::sha256(data);
+        assert_eq!(object_hash(data), want);
+    }
+}
\ No newline at end of file
diff --git a/src/signer.rs b/src/signer.rs
new file mode 100644
index 0000000..435f2aa
--- /dev/null
+++ b/src/signer.rs
@@ -0,0 +1,79 @@
+//! Ed25519 signer/verifier. The only place a private key lives on the client.
+
+use ed25519_dalek::{Signature, Signer as _, SigningKey, VerifyingKey};
+
+use crate::address::{validate_pubkey, Address, AddressError};
+
+#[derive(Debug, Clone)]
+pub struct Signer {
+    signing: SigningKey,
+    key: [u8; 32],
+}
+
+impl Signer {
+    /// Reconstructs a signer from a 32-byte seed.
+    pub fn from_seed(seed: [u8; 32]) -> Result<Signer, AddressError> {
+        let signing = SigningKey::from_bytes(&seed);
+        let key = signing.verifying_key().to_bytes();
+        validate_pubkey(&key)?;
+        Ok(Signer { signing, key })
+    }
+
+    /// Generates a fresh identity from the OS CSPRNG.
+    pub fn generate() -> Result<Signer, AddressError> {
+        let mut seed = [0u8; 32];
+        getrandom::fill(&mut seed).map_err(|_| AddressError::KeySize)?;
+        Signer::from_seed(seed)
+    }
+
+    pub fn pubkey(&self) -> [u8; 32] {
+        self.key
+    }
+
+    pub fn address(&self) -> Result<Address, AddressError> {
+        Address::from_pubkey(&self.key)
+    }
+
+    pub fn seed(&self) -> [u8; 32] {
+        self.signing.to_bytes()
+    }
+
+    /// Signs canonical TCE bytes.
+    pub fn sign(&self, msg: &[u8]) -> [u8; 64] {
+        self.signing.sign(msg).to_bytes()
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum VerifyError {
+    /// The public key itself is unusable.
+    InvalidPublicKey(AddressError),
+    /// The signature does not verify over the message.
+    InvalidSignature,
+}
+
+impl std::fmt::Display for VerifyError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            VerifyError::InvalidPublicKey(e) => write!(f, "invalid public key: {e}"),
+            VerifyError::InvalidSignature => f.write_str("signature does not verify"),
+        }
+    }
+}
+
+/// Verifies an Ed25519 signature (strict) over `msg` against `pubkey`.
+///
+/// `verify_strict` additionally rejects scalar-malleability and torsion-group
+/// malleability, matching the protocol's RFC 8032 requirement. The protocol
+/// also demands the key be validated (canonical, prime-order) before any
+/// signature check; callers should pass keys that passed
+/// `validate_pubkey`, but a small-order key is rejected here too.
+pub fn verify(pubkey: &[u8; 32], msg: &[u8], sig: &[u8; 64]) -> Result<(), VerifyError> {
+    let vk = VerifyingKey::from_bytes(pubkey)
+        .map_err(|_| VerifyError::InvalidPublicKey(AddressError::KeyNotOnCurve))?;
+    if vk.is_weak() {
+        return Err(VerifyError::InvalidPublicKey(AddressError::KeySmallOrder));
+    }
+    let sig = Signature::from_bytes(sig);
+    vk.verify_strict(msg, &sig).map_err(|_| VerifyError::InvalidSignature)
+}
\ No newline at end of file
diff --git a/src/tce/decode.rs b/src/tce/decode.rs
new file mode 100644
index 0000000..306e234
--- /dev/null
+++ b/src/tce/decode.rs
@@ -0,0 +1,202 @@
+//! Strict TCE decoder. Accepts only the exact byte string the encoder would
+//! produce and rejects everything else — never skips unknown fields.
+
+use std::collections::BTreeMap;
+
+use super::number::{is_canonical_number, canonical_number};
+use super::value::Value;
+use super::{
+    validate_key, validate_string, validate_timestamp, TceError, MAGIC, MAGIC_LEN,
+    ADDRESS_VERSION, MAX_KEY_LEN, MAX_MAP_ENTRIES, MAX_STRING_VALUE, MAX_UVARINT_BYTES,
+    PUBKEY_SIZE, VAL_FALSE, VAL_NULL, VAL_NUMBER, VAL_STRING, VAL_TRUE, VERSION,
+};
+
+pub struct Decoder<'a> {
+    buf: &'a [u8],
+    off: usize,
+}
+
+impl<'a> Decoder<'a> {
+    pub fn new(buf: &'a [u8]) -> Self {
+        Self { buf, off: 0 }
+    }
+
+    pub fn remaining(&self) -> usize {
+        self.buf.len() - self.off
+    }
+
+    /// Asserts the input is fully consumed; trailing bytes are an error.
+    pub fn end(&self) -> Result<(), TceError> {
+        if self.off != self.buf.len() {
+            return Err(TceError::Trailing);
+        }
+        Ok(())
+    }
+
+    /// Reads and validates magic, object tag, version.
+    pub fn header(&mut self) -> Result<u8, TceError> {
+        if self.remaining() < MAGIC_LEN {
+            return Err(TceError::Truncated);
+        }
+        if &self.buf[self.off..self.off + MAGIC_LEN] != MAGIC {
+            return Err(TceError::Magic);
+        }
+        self.off += MAGIC_LEN;
+
+        if self.remaining() < 1 {
+            return Err(TceError::Truncated);
+        }
+        let tag = self.buf[self.off];
+        self.off += 1;
+        if !(1..=6).contains(&tag) {
+            return Err(TceError::ObjectTag);
+        }
+
+        let ver = self.uvarint()?;
+        if ver != VERSION {
+            return Err(TceError::Version);
+        }
+        Ok(tag)
+    }
+
+    /// Canonical LEB128 uvarint; non-minimal and oversized forms are rejected.
+    pub fn uvarint(&mut self) -> Result<u64, TceError> {
+        let mut n: u64 = 0;
+        let mut shift: u32 = 0;
+        let start = self.off;
+        loop {
+            if self.off >= self.buf.len() {
+                return Err(TceError::Truncated);
+            }
+            if self.off - start >= MAX_UVARINT_BYTES {
+                return Err(TceError::Uvarint);
+            }
+            let b = self.buf[self.off];
+            self.off += 1;
+
+            if shift >= 64 || (shift == 63 && b > 1) {
+                return Err(TceError::Overflow);
+            }
+            n |= ((b & 0x7f) as u64) << shift;
+
+            if b & 0x80 == 0 {
+                if self.off - start > 1 && b == 0x00 {
+                    return Err(TceError::NonMinimal);
+                }
+                return Ok(n);
+            }
+            shift += 7;
+        }
+    }
+
+    /// Length-prefixed byte string, bounded by `max_len`, checked against
+    /// remaining input before the length is used.
+    pub fn raw_bytes(&mut self, max_len: usize) -> Result<&'a [u8], TceError> {
+        let n = self.uvarint()?;
+        if n > self.remaining() as u64 {
+            return Err(TceError::Truncated);
+        }
+        if n > max_len as u64 {
+            return Err(TceError::TooLong);
+        }
+        let b = &self.buf[self.off..self.off + n as usize];
+        self.off += n as usize;
+        Ok(b)
+    }
+
+    /// Length-prefixed byte string of exactly `want` bytes.
+    pub fn fixed_bytes(&mut self, want: usize) -> Result<&'a [u8], TceError> {
+        let b = self.raw_bytes(want)?;
+        if b.len() != want {
+            return Err(TceError::FieldSize);
+        }
+        Ok(b)
+    }
+
+    /// Length-prefixed validated UTF-8 string.
+    pub fn string(&mut self, max_len: usize) -> Result<String, TceError> {
+        let b = self.raw_bytes(max_len)?;
+        let s = std::str::from_utf8(b).map_err(|_| TceError::Utf8)?;
+        validate_string(s, max_len)?;
+        Ok(s.to_string())
+    }
+
+    /// Identity field: address version + pubkey. Returns a copy.
+    pub fn identity(&mut self) -> Result<[u8; PUBKEY_SIZE], TceError> {
+        let ver = self.uvarint()?;
+        if ver != ADDRESS_VERSION {
+            return Err(TceError::AddressVersion);
+        }
+        let b = self.fixed_bytes(PUBKEY_SIZE)?;
+        let mut out = [0u8; PUBKEY_SIZE];
+        out.copy_from_slice(b);
+        Ok(out)
+    }
+
+    pub fn timestamp(&mut self, allow_zero: bool) -> Result<u64, TceError> {
+        let ts = self.uvarint()?;
+        validate_timestamp(ts, allow_zero)?;
+        Ok(ts)
+    }
+
+    /// Typed value; reserved/unknown tags are rejected, numbers must arrive
+    /// in canonical form.
+    pub fn value(&mut self) -> Result<Value, TceError> {
+        if self.remaining() < 1 {
+            return Err(TceError::Truncated);
+        }
+        let tag = self.buf[self.off];
+        self.off += 1;
+        match tag {
+            VAL_NULL => Ok(Value::Null),
+            VAL_FALSE => Ok(Value::Bool(false)),
+            VAL_TRUE => Ok(Value::Bool(true)),
+            VAL_STRING => {
+                let s = self.string(MAX_STRING_VALUE)?;
+                Ok(Value::Str(s))
+            }
+            VAL_NUMBER => {
+                let b = self.raw_bytes(super::MAX_NUMBER_TOKEN)?;
+                let tok = std::str::from_utf8(b).map_err(|_| TceError::NumberFormat)?;
+                if !is_canonical_number(tok) {
+                    return Err(TceError::NumberFormat);
+                }
+                Ok(Value::Number(canonical_number(tok).expect("canonical")))
+            }
+            _ => Err(TceError::ValueTag),
+        }
+    }
+
+    /// Map with ascending-order, uniqueness, grammar and entry-limit checks.
+    pub fn map(&mut self, min_entries: usize) -> Result<BTreeMap<String, Value>, TceError> {
+        let n = self.uvarint()?;
+        if n > MAX_MAP_ENTRIES as u64 {
+            return Err(TceError::TooLong);
+        }
+        if n < min_entries as u64 {
+            return Err(TceError::EmptyMap);
+        }
+        // Each entry costs at least two bytes; refuse an impossible count
+        // before allocating.
+        if n > self.remaining() as u64 {
+            return Err(TceError::Truncated);
+        }
+        let mut m = BTreeMap::new();
+        let mut prev: Option<String> = None;
+        for _ in 0..n {
+            let kb = self.raw_bytes(MAX_KEY_LEN)?;
+            let key = std::str::from_utf8(kb).map_err(|_| TceError::Utf8)?;
+            validate_key(key)?;
+            if prev.as_deref().is_some_and(|p| key == p) {
+                return Err(TceError::DuplicateKey);
+            }
+            if prev.as_deref().is_some_and(|p| key < p) {
+                return Err(TceError::KeyOrder);
+            }
+            let v = self.value()?;
+            m.insert(key.to_string(), v);
+            prev = Some(key.to_string());
+        }
+        Ok(m)
+    }
+}
\ No newline at end of file
diff --git a/src/tce/encode.rs b/src/tce/encode.rs
new file mode 100644
index 0000000..9e73ec0
--- /dev/null
+++ b/src/tce/encode.rs
@@ -0,0 +1,189 @@
+//! Append-only canonical TCE encoder. Records the first error and then no-ops,
+//! so a caller can write a straight sequence of field writes and check once.
+
+use std::collections::BTreeMap;
+
+use super::number::canonical_number;
+use super::value::Value;
+use super::{
+    append_uvarint, validate_key, validate_string, validate_timestamp, TceError, MAGIC,
+    PUBKEY_SIZE, VAL_FALSE, VAL_NULL, VAL_NUMBER, VAL_STRING, VAL_TRUE, VERSION,
+};
+
+#[derive(Default)]
+pub struct Encoder {
+    buf: Vec<u8>,
+    err: Option<TceError>,
+}
+
+impl Encoder {
+    pub fn new() -> Self {
+        Self { buf: Vec::with_capacity(256), err: None }
+    }
+
+    pub fn err(&self) -> Option<&TceError> {
+        self.err.as_ref()
+    }
+
+    /// Bytes of the object, or the first recorded error.
+    pub fn bytes(&self) -> Result<Vec<u8>, TceError> {
+        match &self.err {
+            Some(e) => Err(e.clone()),
+            None => Ok(self.buf.clone()),
+        }
+    }
+
+    /// Writes magic + object tag + version. Must be the first call.
+    pub fn header(&mut self, tag: u8) {
+        if self.err.is_some() {
+            return;
+        }
+        if !known_object_tag(tag) {
+            self.err = Some(TceError::ObjectTag);
+            return;
+        }
+        self.buf.extend_from_slice(MAGIC);
+        self.buf.push(tag);
+        self.uvarint(VERSION);
+    }
+
+    pub fn uvarint(&mut self, n: u64) {
+        if self.err.is_none() {
+            append_uvarint(&mut self.buf, n);
+        }
+    }
+
+    /// Length-prefixed byte string with no limit of its own.
+    pub fn raw_bytes(&mut self, b: &[u8]) {
+        if self.err.is_some() {
+            return;
+        }
+        append_uvarint(&mut self.buf, b.len() as u64);
+        self.buf.extend_from_slice(b);
+    }
+
+    /// Length-prefixed byte string of exactly `want` bytes.
+    pub fn fixed_bytes(&mut self, b: &[u8], want: usize) {
+        if self.err.is_some() {
+            return;
+        }
+        if b.len() != want {
+            self.err = Some(TceError::FieldSize);
+            return;
+        }
+        self.raw_bytes(b);
+    }
+
+    /// Length-prefixed validated UTF-8 string.
+    pub fn string(&mut self, s: &str, max_len: usize) {
+        if self.err.is_some() {
+            return;
+        }
+        if let Err(e) = validate_string(s, max_len) {
+            self.err = Some(e);
+            return;
+        }
+        self.raw_bytes(s.as_bytes());
+    }
+
+    /// Identity field: address version 0, then length-prefixed raw public key.
+    pub fn identity(&mut self, pubkey: &[u8; PUBKEY_SIZE]) {
+        if self.err.is_some() {
+            return;
+        }
+        self.uvarint(super::ADDRESS_VERSION);
+        self.raw_bytes(pubkey);
+    }
+
+    /// Timestamp with protocol range validation.
+    pub fn timestamp(&mut self, ts: u64, allow_zero: bool) {
+        if self.err.is_some() {
+            return;
+        }
+        if let Err(e) = validate_timestamp(ts, allow_zero) {
+            self.err = Some(e);
+            return;
+        }
+        self.uvarint(ts);
+    }
+
+    /// Typed value: null/false/true have no body; strings and numbers are
+    /// length-prefixed. Numbers are canonicalized here.
+    pub fn value(&mut self, v: &Value) {
+        if self.err.is_some() {
+            return;
+        }
+        match v {
+            Value::Null => self.buf.push(VAL_NULL),
+            Value::Bool(false) => self.buf.push(VAL_FALSE),
+            Value::Bool(true) => self.buf.push(VAL_TRUE),
+            Value::Str(s) => {
+                if let Err(e) = validate_string(s, super::MAX_STRING_VALUE) {
+                    self.err = Some(e);
+                    return;
+                }
+                self.buf.push(VAL_STRING);
+                self.raw_bytes(s.as_bytes());
+            }
+            Value::Number(tok) => {
+                let canon = match canonical_number(tok) {
+                    Ok(c) => c,
+                    Err(e) => {
+                        self.err = Some(e);
+                        return;
+                    }
+                };
+                self.buf.push(VAL_NUMBER);
+                self.raw_bytes(canon.as_bytes());
+            }
+        }
+    }
+
+    /// Map in canonical (bytewise ascending) order. `min_entries` is enforced.
+    pub fn map(&mut self, m: &BTreeMap<String, Value>, min_entries: usize) {
+        if self.err.is_some() {
+            return;
+        }
+        if m.len() < min_entries {
+            self.err = Some(TceError::EmptyMap);
+            return;
+        }
+        if m.len() > super::MAX_MAP_ENTRIES {
+            self.err = Some(TceError::TooLong);
+            return;
+        }
+        for k in m.keys() {
+            if let Err(e) = validate_key(k) {
+                self.err = Some(e);
+                return;
+            }
+        }
+        self.uvarint(m.len() as u64);
+        for (k, v) in m {
+            self.raw_bytes(k.as_bytes());
+            self.value(v);
+            if self.err.is_some() {
+                return;
+            }
+        }
+    }
+
+    /// Applies a whole-object size limit.
+    pub fn check_size(&mut self, limit: usize) {
+        if self.err.is_none() && self.buf.len() > limit {
+            self.err = Some(TceError::ObjectTooLarge);
+        }
+    }
+}
+
+fn known_object_tag(tag: u8) -> bool {
+    matches!(
+        tag,
+        super::TAG_IDENTITY
+            | super::TAG_CLAIM
+            | super::TAG_REVOCATION
+            | super::TAG_APPROVAL_REQUEST
+            | super::TAG_APPROVAL_RESPONSE
+            | super::TAG_AUTH_ASSERTION
+    )
+}
\ No newline at end of file
diff --git a/src/tce/mod.rs b/src/tce/mod.rs
new file mode 100644
index 0000000..e6ccfb7
--- /dev/null
+++ b/src/tce/mod.rs
@@ -0,0 +1,237 @@
+//! TCE — Trust Canonical Encoding, version 1.
+//!
+//! Byte-exact port of the normative specification in docs/PROTOCOL.md of the
+//! niko_trust relay. The frozen vectors in `testdata/vectors/tce_vectors.json`
+//! are the ground truth this module is checked against; see tests/tce_vectors.rs.
+
+pub mod decode;
+pub mod encode;
+pub mod number;
+pub mod value;
+
+pub use value::Value;
+
+/// Framing magic: `trust.n1ko.dev/tce/1` followed by NUL.
+pub const MAGIC: &[u8; 21] = b"trust.n1ko.dev/tce/1\x00";
+pub const MAGIC_LEN: usize = 21;
+
+/// Object version encoded by this implementation.
+pub const VERSION: u64 = 1;
+
+/// Object tags (domain separation, inside signed bytes).
+pub const TAG_IDENTITY: u8 = 0x01;
+pub const TAG_CLAIM: u8 = 0x02;
+pub const TAG_REVOCATION: u8 = 0x03;
+pub const TAG_APPROVAL_REQUEST: u8 = 0x04;
+pub const TAG_APPROVAL_RESPONSE: u8 = 0x05;
+pub const TAG_AUTH_ASSERTION: u8 = 0x06;
+
+/// Value tags.
+pub const VAL_NULL: u8 = 0x00;
+pub const VAL_FALSE: u8 = 0x01;
+pub const VAL_TRUE: u8 = 0x02;
+pub const VAL_STRING: u8 = 0x03;
+pub const VAL_NUMBER: u8 = 0x04;
+
+/// Fixed sizes.
+pub const ADDRESS_VERSION: u64 = 0;
+pub const PUBKEY_SIZE: usize = 32;
+pub const NONCE_SIZE: usize = 16;
+pub const HASH_SIZE: usize = 32;
+pub const CHALLENGE_SIZE: usize = 32;
+pub const SIGNATURE_SIZE: usize = 64;
+
+/// Field limits (PROTOCOL.md section 6.3).
+pub const MAX_UVARINT_BYTES: usize = 10;
+pub const MAX_KEY_LEN: usize = 128;
+pub const MAX_STRING_VALUE: usize = 512;
+pub const MAX_NUMBER_TOKEN: usize = 52;
+pub const MAX_MAP_ENTRIES: usize = 32;
+pub const MAX_ACTION_LEN: usize = 128;
+pub const MAX_MESSAGE_LEN: usize = 256;
+pub const MAX_REASON_LEN: usize = 256;
+pub const MAX_ALIAS_LEN: usize = 64;
+pub const MAX_SCOPE_LEN: usize = 32;
+pub const MAX_AUDIENCE_LEN: usize = 128;
+pub const MAX_NUMBER_INT_DIGS: usize = 32;
+pub const MAX_NUMBER_FRAC_DIG: usize = 18;
+pub const MAX_NUMBER_SOURCE: usize = 64;
+
+/// Whole-object TCE limits.
+pub const MAX_IDENTITY_TCE: usize = 1024;
+pub const MAX_CLAIM_TCE: usize = 4096;
+pub const MAX_REVOC_TCE: usize = 1024;
+pub const MAX_REQUEST_TCE: usize = 8192;
+pub const MAX_RESPONSE_TCE: usize = 1024;
+pub const MAX_AUTH_TCE: usize = 1024;
+
+/// Timestamp bounds.
+pub const MIN_TIMESTAMP: u64 = 1_000_000_000;
+pub const MAX_TIMESTAMP: u64 = 4_102_444_800;
+
+/// Max lifetime of an ApprovalRequest (seconds).
+pub const MAX_APPROVAL_LIFETIME: u64 = 60;
+
+/// Decision values.
+pub const DECISION_DENY: u64 = 0;
+pub const DECISION_ALLOW: u64 = 1;
+
+/// TCE / protocol error set. Mirrors the small, data-free error set of the Go
+/// reference so a hostile object cannot influence error text.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum TceError {
+    /// Bad framing magic.
+    Magic,
+    /// Unknown object tag.
+    ObjectTag,
+    /// Unsupported object version.
+    Version,
+    /// Input ended mid-field.
+    Truncated,
+    /// Bytes after the last field.
+    Trailing,
+    /// Malformed uvarint (too many bytes / truncated).
+    Uvarint,
+    /// Non-minimal uvarint spelling.
+    NonMinimal,
+    /// Uvarint overflow.
+    Overflow,
+    /// Field exceeds its maximum length.
+    TooLong,
+    /// Whole object exceeds its size limit.
+    ObjectTooLarge,
+    /// Invalid UTF-8.
+    Utf8,
+    /// Control character in a string.
+    ControlChar,
+    /// Map key does not match the key grammar.
+    KeyGrammar,
+    /// Duplicate map key.
+    DuplicateKey,
+    /// Map keys not ascending.
+    KeyOrder,
+    /// Unknown or reserved value tag.
+    ValueTag,
+    /// Malformed or non-canonical number token.
+    NumberFormat,
+    /// Number out of representable range.
+    NumberRange,
+    /// Timestamp out of range.
+    Timestamp,
+    /// Fixed-size field has wrong length.
+    FieldSize,
+    /// Unsupported address version in an identity field.
+    AddressVersion,
+    /// Map requires at least the specified entries.
+    EmptyMap,
+    /// Unknown decision value.
+    Decision,
+    /// Approval lifetime out of bounds.
+    Lifetime,
+    /// expires_at must be after created_at.
+    Expiry,
+    /// Decoded to a different object type than expected.
+    WrongObject,
+    /// Signature has wrong length or does not verify.
+    Signature,
+    /// Other identity errors surfaced as strings.
+    Protocol(String),
+}
+
+impl std::fmt::Display for TceError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let s = match self {
+            TceError::Magic => "tce: bad magic",
+            TceError::ObjectTag => "tce: unknown object tag",
+            TceError::Version => "tce: unsupported object version",
+            TceError::Truncated => "tce: truncated input",
+            TceError::Trailing => "tce: trailing bytes after object",
+            TceError::Uvarint => "tce: malformed uvarint",
+            TceError::NonMinimal => "tce: non-minimal uvarint",
+            TceError::Overflow => "tce: integer overflow",
+            TceError::TooLong => "tce: field exceeds maximum length",
+            TceError::ObjectTooLarge => "tce: object exceeds maximum size",
+            TceError::Utf8 => "tce: invalid UTF-8",
+            TceError::ControlChar => "tce: control character in string",
+            TceError::KeyGrammar => "tce: map key does not match grammar",
+            TceError::DuplicateKey => "tce: duplicate map key",
+            TceError::KeyOrder => "tce: map keys not in ascending order",
+            TceError::ValueTag => "tce: unknown or reserved value tag",
+            TceError::NumberFormat => "tce: not a valid JSON number",
+            TceError::NumberRange => "tce: number out of representable range",
+            TceError::Timestamp => "tce: timestamp out of range",
+            TceError::FieldSize => "tce: fixed-size field has wrong length",
+            TceError::AddressVersion => "tce: unsupported address version",
+            TceError::EmptyMap => "tce: map requires at least one entry",
+            TceError::Decision => "tce: unknown decision value",
+            TceError::Lifetime => "tce: approval lifetime out of bounds",
+            TceError::Expiry => "tce: expires_at must be after created_at",
+            TceError::WrongObject => "protocol: unexpected object type",
+            TceError::Signature => "protocol: signature does not verify",
+            TceError::Protocol(m) => return f.write_str(m),
+        };
+        f.write_str(s)
+    }
+}
+
+impl std::error::Error for TceError {}
+
+/// Appends the canonical LEB128 encoding of `n` (shortest form).
+pub fn append_uvarint(dst: &mut Vec<u8>, mut n: u64) {
+    while n >= 0x80 {
+        dst.push((n as u8) | 0x80);
+        n >>= 7;
+    }
+    dst.push(n as u8);
+}
+
+/// Validates a timestamp against protocol bounds. `allow_zero` permits the one
+/// exception `0` meaning "does not expire".
+pub fn validate_timestamp(ts: u64, allow_zero: bool) -> Result<(), TceError> {
+    if allow_zero && ts == 0 {
+        return Ok(());
+    }
+    if !(MIN_TIMESTAMP..=MAX_TIMESTAMP).contains(&ts) {
+        return Err(TceError::Timestamp);
+    }
+    Ok(())
+}
+
+/// Applies the protocol string rules: length bound, valid UTF-8, no controls.
+pub fn validate_string(s: &str, max_len: usize) -> Result<(), TceError> {
+    if s.len() > max_len {
+        return Err(TceError::TooLong);
+    }
+    for c in s.chars() {
+        if c <= '\u{1f}' || c == '\u{7f}' || ('\u{80}'..='\u{9f}').contains(&c) {
+            return Err(TceError::ControlChar);
+        }
+    }
+    Ok(())
+}
+
+/// Map key grammar: `[a-z][a-z0-9]*([._-][a-z0-9]+)*`.
+pub fn validate_key(k: &str) -> Result<(), TceError> {
+    let b = k.as_bytes();
+    if b.is_empty() || b.len() > MAX_KEY_LEN {
+        return Err(TceError::TooLong);
+    }
+    if !b[0].is_ascii_lowercase() {
+        return Err(TceError::KeyGrammar);
+    }
+    let mut prev_sep = false;
+    for i in 1..b.len() {
+        let c = b[i];
+        if c.is_ascii_lowercase() || c.is_ascii_digit() {
+            prev_sep = false;
+        } else if c == b'.' || c == b'_' || c == b'-' {
+            if prev_sep || i == b.len() - 1 {
+                return Err(TceError::KeyGrammar);
+            }
+            prev_sep = true;
+        } else {
+            return Err(TceError::KeyGrammar);
+        }
+    }
+    Ok(())
+}
\ No newline at end of file
diff --git a/src/tce/number.rs b/src/tce/number.rs
new file mode 100644
index 0000000..9e664bd
--- /dev/null
+++ b/src/tce/number.rs
@@ -0,0 +1,247 @@
+//! Number canonicalization (PROTOCOL.md section 5.1).
+//!
+//! Numbers are carried as decimal text. The canonical form is plain decimal
+//! with no exponent, no leading zeros, and no trailing fractional zeros.
+//! Negative zero is not representable and maps to "0". No binary float is ever
+//! involved.
+
+use crate::tce::{TceError, MAX_NUMBER_FRAC_DIG, MAX_NUMBER_INT_DIGS, MAX_NUMBER_SOURCE, MAX_NUMBER_TOKEN};
+
+fn is_digit(c: u8) -> bool {
+    c.is_ascii_digit()
+}
+
+fn zeros(n: usize) -> String {
+    if n == 0 {
+        return String::new();
+    }
+    "0".repeat(n)
+}
+
+/// Splits a token into (int_part, frac_part, exp_part, negative).
+fn split_number(s: &str) -> Result<(String, String, String, bool), TceError> {
+    let b = s.as_bytes();
+    let mut i = 0;
+    let negative = if i < b.len() && b[i] == b'-' {
+        i += 1;
+        true
+    } else {
+        false
+    };
+
+    let start = i;
+    if i >= b.len() {
+        return Err(TceError::NumberFormat);
+    }
+    if b[i] == b'0' {
+        i += 1;
+    } else if b[i].is_ascii_digit() && b[i] != b'0' {
+        while i < b.len() && is_digit(b[i]) {
+            i += 1;
+        }
+    } else {
+        return Err(TceError::NumberFormat);
+    }
+    let int_part = &s[start..i];
+    if int_part.len() > 1 && int_part.as_bytes()[0] == b'0' {
+        return Err(TceError::NumberFormat);
+    }
+
+    let mut frac_part = "";
+    if i < b.len() && b[i] == b'.' {
+        i += 1;
+        let fs = i;
+        while i < b.len() && is_digit(b[i]) {
+            i += 1;
+        }
+        if i == fs {
+            return Err(TceError::NumberFormat);
+        }
+        frac_part = &s[fs..i];
+    }
+
+    let mut exp_part = "";
+    if i < b.len() && (b[i] == b'e' || b[i] == b'E') {
+        i += 1;
+        let es = i;
+        if i < b.len() && (b[i] == b'+' || b[i] == b'-') {
+            i += 1;
+        }
+        let ds = i;
+        while i < b.len() && is_digit(b[i]) {
+            i += 1;
+        }
+        if i == ds {
+            return Err(TceError::NumberFormat);
+        }
+        exp_part = &s[es..i];
+    }
+
+    if i != b.len() {
+        return Err(TceError::NumberFormat);
+    }
+    Ok((int_part.to_string(), frac_part.to_string(), exp_part.to_string(), negative))
+}
+
+fn trim_leading_zeros(s: &str) -> &str {
+    let mut i = 0;
+    while i < s.len() - 1 && s.as_bytes()[i] == b'0' {
+        i += 1;
+    }
+    &s[i..]
+}
+
+/// Reduces a JSON number source token to its unique canonical form.
+pub fn canonical_number(token: &str) -> Result<String, TceError> {
+    if token.is_empty() || token.len() > MAX_NUMBER_SOURCE {
+        return Err(TceError::NumberFormat);
+    }
+    let (int_part, frac_part, exp_part, negative) = split_number(token)?;
+
+    if exp_part.len() > 4 {
+        return Err(TceError::NumberRange);
+    }
+    let mut exp: i64 = 0;
+    if !exp_part.is_empty() {
+        let mut k = 0;
+        let exp_neg = {
+            let c = exp_part.as_bytes()[0];
+            if c == b'+' || c == b'-' {
+                k = 1;
+                c == b'-'
+            } else {
+                false
+            }
+        };
+        let digits = &exp_part[k..];
+        if digits.is_empty() || digits.len() > 4 {
+            return Err(TceError::NumberRange);
+        }
+        for c in digits.bytes() {
+            exp = exp * 10 + (c - b'0') as i64;
+        }
+        if exp_neg {
+            exp = -exp;
+        }
+    }
+
+    // value = sign * mantissa * 10^scale, mantissa = int_part ++ frac_part.
+    let digits = format!("{}{}", int_part, frac_part);
+    let scale: i64 = exp - frac_part.len() as i64;
+
+    // Strip leading zeros of the mantissa (equivalent to big.Int parse).
+    let mantissa = trim_leading_zeros(&digits);
+
+    if *mantissa == *"0" {
+        return Ok("0".to_string());
+    }
+
+    // Strip trailing zeros while scale < 0 (fractional padding only).
+    let mut ds = mantissa.to_string();
+    let mut scale = scale;
+    while scale < 0 && ds.ends_with('0') {
+        ds.pop();
+        scale += 1;
+    }
+
+    if scale > 0 && ds.len() + scale as usize > MAX_NUMBER_INT_DIGS {
+        return Err(TceError::NumberRange);
+    }
+    if scale < 0 && -scale > MAX_NUMBER_FRAC_DIG as i64 + ds.len() as i64 {
+        return Err(TceError::NumberRange);
+    }
+
+    let (int_digits, frac_digits): (String, String);
+    if scale >= 0 {
+        int_digits = format!("{}{}", ds, zeros(scale as usize));
+        frac_digits = String::new();
+    } else {
+        let point = ds.len() as i64 + scale;
+        if point <= 0 {
+            int_digits = "0".to_string();
+            frac_digits = format!("{}{}", zeros((-point) as usize), ds);
+        } else {
+            int_digits = ds[..point as usize].to_string();
+            frac_digits = ds[point as usize..].to_string();
+        }
+    }
+
+    if trim_leading_zeros(&int_digits).len() > MAX_NUMBER_INT_DIGS {
+        return Err(TceError::NumberRange);
+    }
+    if frac_digits.len() > MAX_NUMBER_FRAC_DIG {
+        return Err(TceError::NumberRange);
+    }
+
+    let mut n = int_digits.len();
+    if negative {
+        n += 1;
+    }
+    if !frac_digits.is_empty() {
+        n += 1 + frac_digits.len();
+    }
+    if n > MAX_NUMBER_TOKEN {
+        return Err(TceError::NumberRange);
+    }
+
+    let mut out = String::with_capacity(n);
+    if negative {
+        out.push('-');
+    }
+    out.push_str(&int_digits);
+    if !frac_digits.is_empty() {
+        out.push('.');
+        out.push_str(&frac_digits);
+    }
+    Ok(out)
+}
+
+/// Reports whether `token` is already in canonical form (decoder check).
+pub fn is_canonical_number(token: &str) -> bool {
+    matches!(canonical_number(token), Ok(ref c) if c == token)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn basic_cases() {
+        for (input, want) in [
+            ("0", "0"),
+            ("-0", "0"),
+            ("0.0", "0"),
+            ("0e10", "0"),
+            ("1", "1"),
+            ("1.0", "1"),
+            ("1e0", "1"),
+            ("1.000", "1"),
+            ("1e1", "10"),
+            ("1.5", "1.5"),
+            ("1.50", "1.5"),
+            ("1e-1", "0.1"),
+            ("1e-3", "0.001"),
+            ("1.23e2", "123"),
+            ("1e18", "1000000000000000000"),
+            ("-1e-18", "-0.000000000000000001"),
+            ("12345678901234567890", "12345678901234567890"),
+            ("999999999999999999999999", "999999999999999999999999"),
+            ("1E+2", "100"),
+            ("-0.0000", "0"),
+        ] {
+            assert_eq!(canonical_number(input).unwrap(), want, "input {input}");
+        }
+    }
+
+    #[test]
+    fn rejected_cases() {
+        for input in ["+1", "01", "1.", ".5", "1e", "0x10", "NaN", "Infinity", "1_000", "1e99999", "1e9999"] {
+            assert!(canonical_number(input).is_err(), "should reject {input}");
+        }
+        // 1 followed by 40 zeros exceeds integer digits.
+        let big = format!("1{}", "0".repeat(40));
+        assert!(canonical_number(&big).is_err());
+        // too many fractional digits
+        assert!(canonical_number("0.0000000000000000011").is_err());
+    }
+}
\ No newline at end of file
diff --git a/src/tce/value.rs b/src/tce/value.rs
new file mode 100644
index 0000000..d184285
--- /dev/null
+++ b/src/tce/value.rs
@@ -0,0 +1,75 @@
+//! Typed claim/payload values.
+
+use crate::tce::number::{canonical_number, is_canonical_number as is_canonical};
+
+/// A claim or approval payload value. The set of representable values is
+/// exactly the set the specification defines; there is no way to hold a
+/// reserved tag.
+#[derive(Clone, Debug)]
+pub enum Value {
+    Null,
+    Bool(bool),
+    Str(String),
+    /// Number as its decimal source token. After decode always canonical;
+    /// before encode it is canonicalized by the encoder.
+    Number(String),
+}
+
+impl Value {
+    pub fn num(token: impl Into<String>) -> Value {
+        Value::Number(token.into())
+    }
+
+    /// Canonical form token when this is a number.
+    pub fn number_token(&self) -> Option<String> {
+        match self {
+            Value::Number(t) => canonical_number(t).ok(),
+            _ => None,
+        }
+    }
+}
+
+impl PartialEq for Value {
+    fn eq(&self, other: &Self) -> bool {
+        use Value::*;
+        match (self, other) {
+            (Null, Null) => true,
+            (Bool(a), Bool(b)) => a == b,
+            (Str(a), Str(b)) => a == b,
+            (Number(a), Number(b)) => match (canonical_number(a), canonical_number(b)) {
+                (Ok(x), Ok(y)) => x == y,
+                _ => false,
+            },
+            _ => false,
+        }
+    }
+}
+
+/// Reads the value tag byte for encoding.
+#[allow(dead_code)]
+pub fn tag_of(v: &Value) -> u8 {
+    match v {
+        Value::Null => crate::tce::VAL_NULL,
+        Value::Bool(false) => crate::tce::VAL_FALSE,
+        Value::Bool(true) => crate::tce::VAL_TRUE,
+        Value::Str(_) => crate::tce::VAL_STRING,
+        Value::Number(_) => crate::tce::VAL_NUMBER,
+    }
+}
+
+/// Whether a raw value tag byte is a defined, non-reserved tag.
+pub fn known_tag(tag: u8) -> bool {
+    matches!(
+        tag,
+        crate::tce::VAL_NULL
+            | crate::tce::VAL_FALSE
+            | crate::tce::VAL_TRUE
+            | crate::tce::VAL_STRING
+            | crate::tce::VAL_NUMBER
+    )
+}
+
+/// Whether `token` is already in canonical form, for the decoder.
+pub fn is_canonical_number(token: &str) -> bool {
+    is_canonical(token)
+}
\ No newline at end of file
diff --git a/src/vault.rs b/src/vault.rs
new file mode 100644
index 0000000..486755d
--- /dev/null
+++ b/src/vault.rs
@@ -0,0 +1,235 @@
+//! Vault: the single portable state file.
+//!
+//! Everything the app persists lives in one JSON document,
+//! `<config_dir>/niko-trust/vault.json` (`~/.config/niko-trust/` on Linux,
+//! `%APPDATA%\niko-trust\` on Windows). Copy that one file to another device
+//! and the whole identity, address book, history and settings move with it.
+//!
+//! The identity is stored exactly in the keyring `FileFormat` (argon2id +
+//! XChaCha20-Poly1305), so a vault remains useless without the passphrase.
+
+use std::collections::BTreeMap;
+use std::path::PathBuf;
+
+use crate::inbox::{HistoryItem, Outcome};
+
+pub const VAULT_VERSION: u8 = 1;
+
+/// One stored history entry (display-only; responses are never replayed).
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct StoredItem {
+    pub id: String, // request_id hex
+    pub sender: String,
+    pub action: String,
+    pub message: String,
+    pub created_at: u64,
+    pub expires_at: u64,
+    /// outcome label, one of pending/approved/denied/expired/stale
+    pub outcome: String,
+}
+
+impl From<&HistoryItem> for StoredItem {
+    fn from(h: &HistoryItem) -> Self {
+        StoredItem {
+            id: h.request_id_hex.clone(),
+            sender: h.sender.to_string().to_owned(),
+            action: h.action.clone(),
+            message: h.message.clone(),
+            created_at: h.created_at,
+            expires_at: h.expires_at,
+            outcome: crate::inbox::outcome_label(h.outcome).to_string(),
+        }
+    }
+}
+
+impl TryFrom<&StoredItem> for HistoryItem {
+    type Error = ();
+    fn try_from(s: &StoredItem) -> Result<Self, Self::Error> {
+        let sender = crate::address::Address::parse(&s.sender).map_err(|_| ())?;
+        let outcome = match s.outcome.as_str() {
+            "approved" => Outcome::Approved,
+            "denied" => Outcome::Denied,
+            "expired" => Outcome::TimedOut,
+            "stale" => Outcome::Stale,
+            _ => Outcome::Pending,
+        };
+        Ok(HistoryItem {
+            request_id_hex: s.id.clone(),
+            sender,
+            action: s.action.clone(),
+            message: s.message.clone(),
+            created_at: s.created_at,
+            expires_at: s.expires_at,
+            outcome,
+        })
+    }
+}
+
+#[derive(Debug, Default, serde::Serialize, serde::Deserialize)]
+struct VaultData {
+    version: u8,
+    /// Keyring FileFormat (opaque here), present once an identity exists.
+    #[serde(default)]
+    identity: Option<serde_json::Value>,
+    #[serde(default)]
+    address_book: BTreeMap<String, String>,
+    #[serde(default)]
+    history: Vec<StoredItem>,
+    #[serde(default)]
+    relay_url: String,
+}
+
+/// Handle over the loaded vault file.
+#[derive(Debug)]
+pub struct Vault {
+    path: PathBuf,
+    data: VaultData,
+}
+
+/// The directory holding `vault.json` (created if missing).
+pub fn config_dir() -> PathBuf {
+    let base = dirs::config_dir().unwrap_or_else(|| PathBuf::from("."));
+    base.join("niko-trust")
+}
+
+impl Vault {
+    /// Loads `vault.json`; a missing or corrupt file yields defaults. Migrates
+    /// the legacy `identity.json` / `addressbook.json` files when present.
+    pub fn load() -> Vault {
+        let dir = config_dir();
+        let _ = std::fs::create_dir_all(&dir);
+        let path = dir.join("vault.json");
+        let mut data: VaultData = std::fs::read(&path)
+            .ok()
+            .and_then(|b| serde_json::from_slice(&b).ok())
+            .unwrap_or_default();
+        data.version = VAULT_VERSION;
+
+        // Legacy migration: identity written by older builds.
+        if data.identity.is_none() {
+            let legacy = dir.join("identity.json");
+            if let Ok(raw) = std::fs::read_to_string(&legacy) {
+                if let Ok(v) = serde_json::from_str::<serde_json::Value>(&raw) {
+                    data.identity = Some(v);
+                }
+            }
+        }
+        // Legacy migration: address book written by older builds.
+        let legacy_book = dir.join("addressbook.json");
+        if data.address_book.is_empty() {
+            if let Ok(raw) = std::fs::read_to_string(&legacy_book) {
+                if let Ok(m) = serde_json::from_str::<BTreeMap<String, String>>(&raw) {
+                    data.address_book = m;
+                }
+            }
+        }
+
+        let v = Vault { path, data };
+        v.save();
+        v
+    }
+
+    pub fn save(&self) {
+        if let Ok(json) = serde_json::to_vec_pretty(&self.data) {
+            let _ = std::fs::write(&self.path, json);
+            #[cfg(unix)]
+            {
+                use std::os::unix::fs::PermissionsExt;
+                let _ = std::fs::set_permissions(
+                    &self.path,
+                    std::fs::Permissions::from_mode(0o600),
+                );
+            }
+        }
+    }
+
+    pub fn path(&self) -> &std::path::Path {
+        &self.path
+    }
+
+    // ------------------------------------------------------- identity
+
+    pub fn identity_blob(&self) -> Option<&serde_json::Value> {
+        self.data.identity.as_ref()
+    }
+
+    pub fn set_identity_blob(&mut self, v: serde_json::Value) {
+        self.data.identity = Some(v);
+        self.save();
+    }
+
+    // --------------------------------------------------- address book
+
+    pub fn address_book(&self) -> &BTreeMap<String, String> {
+        &self.data.address_book
+    }
+
+    pub fn set_address_book(&mut self, entries: BTreeMap<String, String>) {
+        self.data.address_book = entries;
+        self.save();
+    }
+
+    // -------------------------------------------------------- history
+
+    pub fn history(&self) -> &[StoredItem] {
+        &self.data.history
+    }
+
+    pub fn set_history(&mut self, items: Vec<StoredItem>) {
+        self.data.history = items;
+        self.save();
+    }
+
+    // ------------------------------------------------------- settings
+
+    pub fn relay_url(&self) -> &str {
+        &self.data.relay_url
+    }
+
+    pub fn set_relay_url(&mut self, url: impl Into<String>) {
+        self.data.relay_url = url.into();
+        self.save();
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn roundtrip_all_sections() {
+        let dir = std::env::temp_dir().join(format!("nk-vault-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        // Can't easily override config_dir(); exercise VaultData directly via
+        // serde by writing and re-reading through a temp file path clone.
+        let mut data = VaultData {
+            version: VAULT_VERSION,
+            ..Default::default()
+        };
+        data.relay_url = "https://relay.example".into();
+        let addr = "trust1qz8jrkwdnqscwrvptu69z6ntd2dp092s0fk25ayq94qlzsx649dszg7tx6w";
+        data.address_book.insert(addr.to_string(), "Niko".into());
+        data.history.push(StoredItem {
+            id: "ff".repeat(32),
+            sender: addr.to_string(),
+            action: "2fa".into(),
+            message: "hi".into(),
+            created_at: 1_700_000_000,
+            expires_at: 1_700_000_060,
+            outcome: "approved".into(),
+        });
+
+        let p = dir.join("vault.json");
+        std::fs::write(&p, serde_json::to_vec(&data).unwrap()).unwrap();
+        let back: VaultData = serde_json::from_slice(&std::fs::read(&p).unwrap()).unwrap();
+        assert_eq!(back.relay_url, "https://relay.example");
+        assert_eq!(back.address_book.get(addr).map(String::as_str), Some("Niko"));
+        assert_eq!(back.history.len(), 1);
+
+        let h = HistoryItem::try_from(&back.history[0]).unwrap();
+        assert_eq!(h.outcome, Outcome::Approved);
+        assert_eq!(h.request_id_hex, "ff".repeat(32));
+
+        std::fs::remove_dir_all(dir).ok();
+    }
+}
diff --git a/tests/live_relay.rs b/tests/live_relay.rs
new file mode 100644
index 0000000..7f01a59
--- /dev/null
+++ b/tests/live_relay.rs
@@ -0,0 +1,236 @@
+//! Live integration tests against a real relay instance.
+//!
+//! Skips (with a clear message) when `NIKO_RELAY` is not set. The store is
+//! in-memory per server run, so these tests are self-contained: they create
+//! their own sender and recipient identities, post a request, verify and
+//! answer it, and check the response is queryable. Nothing is left behind.
+
+use niko_trust_gui::inbox::{Inbox, Outcome};
+use niko_trust_gui::protocol::{encode_approval_request, ApprovalRequest, Decision};
+use niko_trust_gui::relay::Relay;
+use niko_trust_gui::signer::Signer;
+use niko_trust_gui::tce::NONCE_SIZE;
+
+fn base() -> Option<String> {
+    std::env::var("NIKO_RELAY")
+        .ok()
+        .map(|s| s.trim_end_matches('/').to_string())
+}
+
+fn now() -> u64 {
+    std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .as_secs()
+}
+
+fn mk_request(
+    sender: &Signer,
+    recipient: &Signer,
+    action: &str,
+    message: &str,
+) -> (Vec<u8>, [u8; 64]) {
+    let create = now();
+    let req = ApprovalRequest {
+        sender: sender.pubkey(),
+        recipient: recipient.pubkey(),
+        action: action.to_string(),
+        payload: Default::default(),
+        message: message.to_string(),
+        created_at: create,
+        expires_at: create + 40,
+        nonce: [
+            0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
+            0x0e, 0x0f,
+        ],
+    };
+    let tce = encode_approval_request(&req).expect("encode request");
+    let sig = sender.sign(&tce);
+    (tce, sig)
+}
+
+#[test]
+fn live_auth_fetch_respond_roundtrip() {
+    let Some(base) = base() else {
+        eprintln!("skipping live_auth_fetch_respond_roundtrip: NIKO_RELAY not set");
+        return;
+    };
+
+    let recipient = Signer::generate().expect("recipient signer");
+    let sender = Signer::generate().expect("sender signer");
+
+    // Authenticate as the recipient with the generic "read" scope.
+    let relay = Relay::auth(&base, &recipient, "*").expect("auth handshake");
+    assert!(!relay.audience().is_empty());
+
+    // Sender posts an ApprovalRequest addressed to the recipient.
+    let (req_tce, req_sig) = mk_request(&sender, &recipient, "login", "Approve 2FA login");
+    let sender_agent = Relay::auth(&base, &sender, "*").expect("sender auth");
+    let req_id = sender_agent.store(&req_tce, &req_sig).expect("store request");
+    assert!(!req_id.is_empty());
+
+    // Recipient fetches, decodes and verifies the incoming request.
+    let inbox = relay.fetch_requests(&recipient).expect("fetch requests");
+    assert_eq!(inbox.len(), 1, "expected exactly one new request");
+    let inc = &inbox[0];
+    assert_eq!(inc.request.action, "login");
+    assert_eq!(inc.request.message, "Approve 2FA login");
+
+    // Respond Allow; the relay must accept it.
+    let resp_id = relay
+        .respond(&recipient, &inc.request, &req_tce, Decision::Allow)
+        .expect("respond allow");
+    assert!(!resp_id.is_empty());
+
+    // Responding again to the same request must be refused by the server.
+    let again = relay.respond(&recipient, &inc.request, &req_tce, Decision::Deny);
+    assert!(again.is_err(), "second response to a request must be rejected");
+}
+
+#[test]
+fn live_rejects_wrong_recipient() {
+    let Some(base) = base() else {
+        eprintln!("skipping live_rejects_wrong_recipient: NIKO_RELAY not set");
+        return;
+    };
+
+    let me = Signer::generate().expect("me signer");
+    let someone_else = Signer::generate().expect("victim signer");
+    let sender = Signer::generate().expect("sender signer");
+
+    let relay = Relay::auth(&base, &me, "*").expect("auth");
+
+    // Request addressed to someone_else: polling as `me` must yield nothing.
+    let (req_tce, req_sig) = mk_request(&sender, &someone_else, "x", "not for me");
+    let sender_agent = Relay::auth(&base, &sender, "*").expect("sender auth");
+    sender_agent.store(&req_tce, &req_sig).expect("store");
+
+    let inbox = relay.fetch_requests(&me).expect("fetch");
+    assert!(
+        inbox.iter().all(|r| r.request.recipient != me.pubkey()),
+        "no request may target my key that was addressed elsewhere"
+    );
+}
+
+#[test]
+fn live_ignores_poisoned_envelope() {
+    let Some(base) = base() else {
+        eprintln!("skipping live_ignores_poisoned_envelope: NIKO_RELAY not set");
+        return;
+    };
+
+    let me = Signer::generate().expect("me signer");
+    let sender = Signer::generate().expect("sender signer");
+    let relay = Relay::auth(&base, &me, "*").expect("auth");
+
+    // A request addressed to me but signed by a *different* key. The relay
+    // stores any well-formed envelope without checking signatures (INV-5), so
+    // this lands in the feed; the client must skip it because the signature
+    // does not verify against the request's sender field.
+    let timestamp = now() - 1000;
+    let req = ApprovalRequest {
+        sender: sender.pubkey(),
+        recipient: me.pubkey(),
+        action: "phish".to_string(),
+        payload: Default::default(),
+        message: "".to_string(),
+        created_at: timestamp,
+        expires_at: timestamp + 30,
+        nonce: [7u8; NONCE_SIZE],
+    };
+    let tce = encode_approval_request(&req).expect("encode");
+
+    // Wrong signer: forge a signature with an unrelated identity.
+    let forger = Signer::generate().expect("forger signer");
+    let bad_sig = forger.sign(&tce);
+
+    let sender_agent = Relay::auth(&base, &sender, "*").expect("sender auth");
+    let _ = sender_agent.store(&tce, &bad_sig).expect("store poisoned");
+
+    let inbox = relay.fetch_requests(&me).expect("fetch");
+    assert!(
+        inbox.iter().all(|r| r.request.sender != sender.pubkey() || r.request.action != "phish"),
+        "envelope with a forged signature must be dropped from the inbox"
+    );
+}
+/// Regression: after a restart the in-memory inbox is empty, so an
+/// already-answered request used to reappear as "pending" and re-answering
+/// failed with 422. The client must reconcile each new request against the
+/// relay's responses feed and restore the recorded outcome.
+#[test]
+fn live_restart_reconciles_answered_requests() {
+    let Some(base) = base() else {
+        eprintln!("skipping live_restart_reconciles_answered_requests: NIKO_RELAY not set");
+        return;
+    };
+
+    let recipient = Signer::generate().expect("recipient signer");
+    let sender = Signer::generate().expect("sender signer");
+
+    fn mk(
+        sender: &Signer,
+        recipient: &Signer,
+        message: &str,
+        nonce_byte: u8,
+    ) -> (Vec<u8>, [u8; 64]) {
+        let create = now();
+        let req = ApprovalRequest {
+            sender: sender.pubkey(),
+            recipient: recipient.pubkey(),
+            action: "login".to_string(),
+            payload: Default::default(),
+            message: message.to_string(),
+            created_at: create,
+            expires_at: create + 40,
+            nonce: [nonce_byte; NONCE_SIZE],
+        };
+        let tce = encode_approval_request(&req).expect("encode");
+        let sig = sender.sign(&tce);
+        (tce, sig)
+    }
+
+    let relay = Relay::auth(&base, &recipient, "*").expect("recipient auth");
+    let sender_agent = Relay::auth(&base, &sender, "*").expect("sender auth");
+
+    // Two distinct requests; answer one Allow, the other Deny.
+    let (tce1, sig1) = mk(&sender, &recipient, "restart-allow", 0x01);
+    sender_agent.store(&tce1, &sig1).expect("store 1");
+    let (tce2, sig2) = mk(&sender, &recipient, "restart-deny", 0x02);
+    sender_agent.store(&tce2, &sig2).expect("store 2");
+
+    let list = relay.fetch_requests(&recipient).expect("fetch");
+    for r in &list {
+        let d = if r.request.message == "restart-allow" {
+            Decision::Allow
+        } else {
+            Decision::Deny
+        };
+        relay
+            .respond(&recipient, &r.request, &r.tce, d)
+            .expect("respond as recipient");
+    }
+
+    // Simulate a restart: a brand-new inbox that has never seen anything.
+    let mut inbox = Inbox::new();
+    let list2 = relay.fetch_requests(&recipient).expect("refetch after restart");
+    let new_items = inbox.observe(now(), &list2);
+    assert_eq!(new_items.len(), 2, "both requests are new to the fresh inbox");
+
+    // Reconcile exactly like the GUI does (AnswerChecked).
+    for r in new_items {
+        let rid = hex::encode(r.request_id);
+        let resps = relay.fetch_responses(&rid).expect("responses feed");
+        let mine = resps
+            .into_iter()
+            .find(|x| x.response.responder == recipient.pubkey())
+            .expect("request was answered before the restart");
+        inbox.set_outcome(&r.request_id, Outcome::from(mine.response.decision));
+    }
+
+    let h = inbox.history();
+    let allow = h.iter().find(|x| x.message == "restart-allow").unwrap();
+    let deny = h.iter().find(|x| x.message == "restart-deny").unwrap();
+    assert_eq!(allow.outcome, Outcome::Approved, "answered-allow must not be pending");
+    assert_eq!(deny.outcome, Outcome::Denied, "answered-deny must not be pending");
+    assert_eq!(inbox.pending_count(), 0, "nothing may be left pending after reconciliation");
+}
diff --git a/tests/tce_vectors.rs b/tests/tce_vectors.rs
new file mode 100644
index 0000000..9e63dcd
--- /dev/null
+++ b/tests/tce_vectors.rs
@@ -0,0 +1,260 @@
+//! Byte-exact conformance against the frozen TCE vectors produced by the
+//! reference implementation. The vectors file lives in the relay repo at
+//! ~/niko_trust/testdata/vectors/tce_vectors.json and is the normative ground
+//! truth. If the file is absent the tests are skipped (keeps this crate
+//! self-contained).
+
+use std::collections::BTreeMap;
+use std::path::{Path, PathBuf};
+
+use niko_trust_gui::address::Address;
+use niko_trust_gui::protocol::{self, Decision, MAX_CLOCK_SKEW};
+use niko_trust_gui::signer::{self, Signer};
+use niko_trust_gui::tce::number::canonical_number;
+use niko_trust_gui::tce::value::Value;
+use serde_json::Value as Json;
+
+fn vectors_path() -> PathBuf {
+    if let Ok(p) = std::env::var("NIKO_VECTORS") {
+        return PathBuf::from(p);
+    }
+    let d = std::env::var("CARGO_MANIFEST_DIR").unwrap_or_else(|_| ".".into());
+    Path::new(&d).join("../niko_trust/testdata/vectors/tce_vectors.json")
+}
+
+fn load_vectors() -> Option<Json> {
+    let p = vectors_path();
+    if !p.exists() {
+        eprintln!("skipping: vectors file not found at {}", p.display());
+        return None;
+    }
+    let raw = std::fs::read_to_string(&p).expect("read vectors");
+    serde_json::from_str(&raw).map(Some).expect("parse vectors json")
+}
+
+fn pubkey_of(addr: &str) -> [u8; 32] {
+    let a = Address::parse(addr).expect("valid address");
+    *a.pubkey()
+}
+
+fn seed_for_pubkey(parties: &Json, pubkey_hex: &str) -> [u8; 32] {
+    for (_name, p) in parties.as_object().unwrap() {
+        if p["pubkey_hex"].as_str() == Some(pubkey_hex) {
+            let s = hex::decode(p["seed_hex"].as_str().unwrap()).unwrap();
+            return s.try_into().unwrap();
+        }
+    }
+    panic!("party not found for pubkey {pubkey_hex}")
+}
+
+fn signer_for(parties: &Json, pubkey_hex: &str) -> Signer {
+    Signer::from_seed(seed_for_pubkey(parties, pubkey_hex)).expect("signer")
+}
+
+fn hex_bytes(s: &str) -> Vec<u8> {
+    hex::decode(s).expect("hex")
+}
+
+fn value_from_json(v: &Json) -> Value {
+    match v {
+        Json::Null => Value::Null,
+        Json::Bool(b) => Value::Bool(*b),
+        Json::String(s) => Value::Str(s.clone()),
+        Json::Number(n) => Value::Number(n.to_string()),
+        other => panic!("unsupported value in vector json: {other}"),
+    }
+}
+
+fn map_from_json(v: &Json) -> BTreeMap<String, Value> {
+    let mut m = BTreeMap::new();
+    for (k, val) in v.as_object().unwrap() {
+        m.insert(k.clone(), value_from_json(val));
+    }
+    m
+}
+
+fn nonce_from_json(v: &Json) -> [u8; 16] {
+    hex_bytes(v.as_str().unwrap()).try_into().unwrap()
+}
+
+fn hash_from_json(v: &Json) -> [u8; 32] {
+    hex_bytes(v.as_str().unwrap()).try_into().unwrap()
+}
+
+fn check_vector(parties: &Json, v: &Json) {
+    let tce_expected = hex_bytes(v["tce_hex"].as_str().unwrap());
+    let object_id = v["object_id_hex"].as_str().unwrap();
+    let signer_key = v["signer_pubkey_hex"].as_str().unwrap();
+    let _ = v["signature_hex"];
+    let j = &v["json"];
+    let typ = j["type"].as_str().unwrap();
+    let signer = signer_for(parties, signer_key);
+
+    // Build the typed object from the json view.
+    let encoded: Vec<u8> = match typ {
+        "identity" => protocol::encode_identity(&protocol::Identity {
+            pubkey: signer.pubkey(),
+            alias: j["alias"].as_str().unwrap().to_string(),
+            created_at: j["created_at"].as_u64().unwrap(),
+        })
+        .unwrap(),
+        "claim" => protocol::encode_claim(&protocol::Claim {
+            issuer: signer.pubkey(),
+            subject: pubkey_of(j["subject"].as_str().unwrap()),
+            claims: map_from_json(&j["claims"]),
+            created_at: j["created_at"].as_u64().unwrap(),
+            expires_at: j["expires_at"].as_u64().unwrap(),
+            serial: j["serial"].as_u64().unwrap(),
+            nonce: nonce_from_json(&j["nonce"]),
+        })
+        .unwrap(),
+        "revocation" => protocol::encode_revocation(&protocol::Revocation {
+            issuer: signer.pubkey(),
+            claim_id: hash_from_json(&j["claim_id"]),
+            reason: j["reason"].as_str().unwrap().to_string(),
+            created_at: j["created_at"].as_u64().unwrap(),
+            nonce: nonce_from_json(&j["nonce"]),
+        })
+        .unwrap(),
+        "approval_request" => protocol::encode_approval_request(&protocol::ApprovalRequest {
+            sender: signer.pubkey(),
+            recipient: pubkey_of(j["recipient"].as_str().unwrap()),
+            action: j["action"].as_str().unwrap().to_string(),
+            payload: map_from_json(&j["payload"]),
+            message: j["message"].as_str().unwrap().to_string(),
+            created_at: j["created_at"].as_u64().unwrap(),
+            expires_at: j["expires_at"].as_u64().unwrap(),
+            nonce: nonce_from_json(&j["nonce"]),
+        })
+        .unwrap(),
+        "approval_response" => {
+            let decision = match j["decision"].as_str().unwrap() {
+                "allow" => Decision::Allow,
+                "deny" => Decision::Deny,
+                other => panic!("bad decision {other}"),
+            };
+            protocol::encode_approval_response(&protocol::ApprovalResponse {
+                request_hash: hash_from_json(&j["request_hash"]),
+                responder: signer.pubkey(),
+                decision,
+                created_at: j["created_at"].as_u64().unwrap(),
+                nonce: nonce_from_json(&j["nonce"]),
+            })
+            .unwrap()
+        }
+        "auth_assertion" => protocol::encode_auth_assertion(&protocol::AuthAssertion {
+            pubkey: signer.pubkey(),
+            challenge: hash_from_json(&j["challenge"]),
+            scope: j["scope"].as_str().unwrap().to_string(),
+            audience: j["audience"].as_str().unwrap().to_string(),
+            created_at: j["created_at"].as_u64().unwrap(),
+        })
+        .unwrap(),
+        other => panic!("unknown vector type {other}"),
+    };
+
+    assert_eq!(encoded, tce_expected, "vector {}: encoded bytes differ", v["name"]);
+    assert_eq!(
+        hex::encode(niko_trust_gui::crypto::sha256(&encoded)),
+        object_id,
+        "vector {}: object id differs",
+        v["name"]
+    );
+
+    // Deterministic Ed25519 must reproduce the reference signature.
+    let sig = signer.sign(&encoded);
+    assert_eq!(hex::encode(sig), v["signature_hex"], "vector {}: signature differs", v["name"]);
+
+    // Rule checks on the decoded form.
+    let _ = MAX_CLOCK_SKEW;
+
+    // decode -> re-encode round trip must be byte-identical.
+    let reencoded: Vec<u8> = match typ {
+        "identity" => {
+            let d = protocol::decode_identity(&tce_expected).unwrap();
+            protocol::encode_identity(&d).unwrap()
+        }
+        "claim" => {
+            let d = protocol::decode_claim(&tce_expected).unwrap();
+            protocol::encode_claim(&d).unwrap()
+        }
+        "revocation" => {
+            let d = protocol::decode_revocation(&tce_expected).unwrap();
+            protocol::encode_revocation(&d).unwrap()
+        }
+        "approval_request" => {
+            let d = protocol::decode_approval_request(&tce_expected).unwrap();
+            protocol::encode_approval_request(&d).unwrap()
+        }
+        "approval_response" => {
+            let d = protocol::decode_approval_response(&tce_expected).unwrap();
+            protocol::encode_approval_response(&d).unwrap()
+        }
+        "auth_assertion" => {
+            let d = protocol::decode_auth_assertion(&tce_expected).unwrap();
+            protocol::encode_auth_assertion(&d).unwrap()
+        }
+        _ => unreachable!(),
+    };
+    assert_eq!(reencoded, tce_expected, "vector {}: decode/re-encode differs", v["name"]);
+
+    // Signature verification over the exact bytes with the embedded key.
+    let verify_pub = match typ {
+        "claim" => pubkey_of(j["issuer"].as_str().unwrap()),
+        "approval_response" => signer.pubkey(),
+        "revocation" => signer.pubkey(),
+        "approval_request" => signer.pubkey(),
+        "auth_assertion" => signer.pubkey(),
+        "identity" => signer.pubkey(),
+        _ => unreachable!(),
+    };
+    let sig_vec = hex_bytes(v["signature_hex"].as_str().unwrap());
+    let sig_arr: [u8; 64] = sig_vec.try_into().unwrap();
+    signer::verify(&verify_pub, &tce_expected, &sig_arr).expect("signature must verify");
+}
+
+#[test]
+fn frozen_tce_vectors_byte_exact() {
+    let Some(doc) = load_vectors() else { return };
+    let parties = &doc["parties"];
+    for v in doc["vectors"].as_array().unwrap() {
+        check_vector(parties, v);
+    }
+    assert!(doc["vectors"].as_array().unwrap().len() >= 9);
+}
+
+#[test]
+fn number_canonicalization_vectors() {
+    let Some(doc) = load_vectors() else { return };
+    let nc = &doc["number_canonicalization"];
+    for (input, want) in nc["accept"].as_object().unwrap() {
+        assert_eq!(
+            canonical_number(input).ok(),
+            Some(want.as_str().unwrap().to_string()),
+            "accept {input}"
+        );
+    }
+    for (input, _reason) in nc["reject"].as_object().unwrap() {
+        assert!(canonical_number(input).is_err(), "reject {input}");
+    }
+}
+
+#[test]
+fn strict_decoder_rejects() {
+    let Some(doc) = load_vectors() else { return };
+    // Every reject vector is hex bytes that a strict decoder must refuse as a
+    // Claim (the reference uses a claim context for these). Failing to decode
+    // is the assertion.
+    for r in doc["rejects"].as_array().unwrap() {
+        let name = r["name"].as_str().unwrap();
+        // Some reject rows are prose descriptions without bytes; only rows
+        // carrying tce_hex are byte-checkable here.
+        let Some(b) = r["tce_hex"].as_str().map(hex_bytes) else {
+            continue;
+        };
+        assert!(
+            niko_trust_gui::protocol::decode_claim(&b).is_err(),
+            "reject vector {name} must fail to decode"
+        );
+    }
+}
\ No newline at end of file