Merge pull request 'Phase C: resolve signer from spire seed / bunker binding at bootstrap (#52)' (#60) from phase-c-bunker-bootstrap into dev

Reviewed-on: #60

CLAUDE.md

@@ -84,7 +84,8 @@ Renderer reads (Electron IPC or Vite `import.meta.env`):
 |---|---|---|
 | `VITE_RELAY_URL` | yes | `ws://...` of the relay both ATM and LNbits subscribe to. Dev: `ws://localhost:5001/nostrrelay/test` (LNbits's bundled `nostrrelay` extension — no separate strfry container) |
 | `VITE_LNBITS_SERVER_PUBKEY` | yes | 64-char hex pubkey LNbits prints on startup (`docker logs lnbits \| grep 'Public key (share this)'`) |
-| `VITE_ATM_PRIVATE_KEY` | yes (prod) | 64-char hex. The ATM's nostr identity. Generates ephemeral on first boot if unset (dev only) |
+| `VITE_SPIRE_SEED` | yes (prod) | Spire pairing seed (`spire-seed:v1:<base64url>`) from spirekeeper. Carries a one-shot NIP-46 connect token + the spire signing pubkey + bunker URL. First boot redeems it and persists the binding to `state.db`; later boots resume by fingerprint. A changed seed re-pairs. See aiolabs/bitspire#52. |
+| `VITE_ATM_PRIVATE_KEY` | dev only | 64-char hex raw nsec fallback for running without a bunker. Ignored when `VITE_SPIRE_SEED` or a stored binding exists. |
 | `VITE_OPERATOR_PUBKEYS` | optional | Comma-separated hex pubkeys allowed to send kind-21003 management commands |
 
 The LP-era vars (`VITE_LIGHTNING_PUB_PUBKEY`, `VITE_LIGHTNING_PUB_API_URL`, `VITE_EXTENSION_API_URL`, `VITE_ADMIN_TOKEN`) are gone from the dev branch's `.env.example` and `LightningConfig` interface.
@@ -188,7 +189,7 @@ UP Board enumerates its eMMC controller via ACPI, not PCI. `upboard.nix` force-l
 
 ## Security priorities
 
-1. **Private keys** — Never log nsec. The ATM's `VITE_ATM_PRIVATE_KEY` lives in `/var/lib/bitspire/.env` with mode 0600, owned by `bitspire:bitspire`.
+1. **Private keys** — Never log nsec. In production the ATM holds no signing nsec: `VITE_SPIRE_SEED` (in `/var/lib/bitspire/.env`, mode 0600) carries a one-shot connect token, and the ATM's own NIP-46 *transport* key (`client_secret_hex`) lives in `state.db` (`bunker_binding`). The operator's signing key stays in the bunker. The legacy `VITE_ATM_PRIVATE_KEY` is a dev-only fallback.
 2. **Payments** — Validate the bolt11 amount on cash-out before exposing the QR. Decode `payment_hash` from the bolt11 (cheap, avoids a roundtrip) and use it as the `subscribe_payments` filter.
 3. **Replay** — LNURL-withdraw links use `uses:1` and are deleted on session abort.
 4. **Encryption** — All RPC content is NIP-44 v2. NIP-04 is forbidden.

apps/machine/.env.example

@@ -36,16 +36,23 @@ VITE_LNBITS_SERVER_PUBKEY=
 # aiolabs/withdraw#1 / commit e9d911e.)
 
 # =============================================================================
-# ATM Identity
+# ATM Identity — spire pairing seed (NIP-46 bunker; aiolabs/bitspire#52)
 # =============================================================================
 
+# The spire pairing seed produced by the operator dashboard (spirekeeper):
+#   spire-seed:v1:<base64url>
+# It carries a one-shot NIP-46 connect token + the spire's signing pubkey +
+# the bunker URL. On first boot the ATM redeems the token, generates its own
+# transport key, and persists the binding to state.db; thereafter it resumes
+# from the binding (the seed can stay set — it's matched by fingerprint).
+# A changed seed re-pairs (and re-publishes the cassette-state hello).
+VITE_SPIRE_SEED=
+
 # pragma: allowlist secret
-# ATM's Nostr private key (hex format, 64 characters). This signing
+# DEV ONLY fallback — a raw Nostr private key (hex, 64 chars) for running
-# key IS the credential — LNbits derives the account from it on first
+# without a bunker. Ignored when VITE_SPIRE_SEED or a stored binding exists.
-# contact (issue aiolabs/lnbits#9 alignment).
 # Generate with: openssl rand -hex 32
-# If not set, generates ephemeral identity on each restart (dev only).
+# VITE_ATM_PRIVATE_KEY=
-VITE_ATM_PRIVATE_KEY=
 
 # =============================================================================
 # Operator Identity

apps/machine/electron/fund-atm.ts

@@ -13,8 +13,15 @@
  */
 
 import { readFileSync } from 'node:fs'
-import { NostrClient, LocalSigner, loadIdentityFromHex } from '@bitSpire/nostr-client'
+import {
+  NostrClient,
+  LocalSigner,
+  loadIdentityFromHex,
+  resumeFromBinding,
+  type Signer,
+} from '@bitSpire/nostr-client'
 import { LnbitsClient } from '@bitSpire/lnbits'
+import { initDatabase, getBunkerBinding } from './state-store.js'
 
 // @ts-ignore — qrcode is a transitive dep (via qrcode.vue), no types needed
 import QRCode from 'qrcode'
@@ -56,15 +63,34 @@ async function main() {
   const lnbitsServerPubkey = env['VITE_LNBITS_SERVER_PUBKEY']
   const atmPrivateKey = env['VITE_ATM_PRIVATE_KEY']
 
-  if (!relayUrl || !lnbitsServerPubkey || !atmPrivateKey) {
+  if (!relayUrl || !lnbitsServerPubkey) {
     console.error('Missing required config in', envPath)
-    console.error('Need: VITE_RELAY_URL, VITE_LNBITS_SERVER_PUBKEY, VITE_ATM_PRIVATE_KEY')
+    console.error('Need: VITE_RELAY_URL, VITE_LNBITS_SERVER_PUBKEY')
     process.exit(1)
   }
 
   console.error(`Generating invoice for ${amountSats} sats...`)
 
-  const signer = new LocalSigner(loadIdentityFromHex(atmPrivateKey))
+  // Resolve the signer. Prod: resume the bunker binding from state.db (the
+  // ATM's transport key — the connect token was already redeemed by the main
+  // app, so we can't re-pair here). Dev: a local nsec via VITE_ATM_PRIVATE_KEY.
+  let signer: Signer
+  if (atmPrivateKey) {
+    signer = new LocalSigner(loadIdentityFromHex(atmPrivateKey))
+  } else {
+    initDatabase()
+    const binding = getBunkerBinding()
+    if (!binding) {
+      console.error('ATM is not paired (no bunker binding in state.db) and no')
+      console.error('VITE_ATM_PRIVATE_KEY set. Pair the ATM via the main app first.')
+      process.exit(1)
+    }
+    signer = await resumeFromBinding({
+      clientSecretHex: binding.clientSecretHex,
+      spirePubkey: binding.spirePubkey,
+      bunkerUrl: binding.bunkerUrl,
+    })
+  }
 
   const nostrClient = new NostrClient({
     relays: [{ url: relayUrl }],

apps/machine/electron/main.ts

@@ -26,14 +26,19 @@ import {
   getLastKnownConfigCreatedAt,
   getBootstrapPublishedAt,
   markBootstrapPublished,
+  resetBootstrapGate,
   applyOperatorCassettesConfig,
   getFeeConfig,
   getLastKnownFeeConfigCreatedAt,
   applyFeeConfig,
+  getBunkerBinding,
+  saveBunkerBinding,
+  clearBunkerBinding,
   type OperatorCassettesPayload,
   type FeeConfigPayload,
   type FeeConfigRow,
   type ApplyResult,
+  type StoredBunkerBinding,
 } from './state-store.js'
 import { initializeHal, type HalInstance } from './hal-service.js'
 
@@ -323,14 +328,31 @@ let secretsConsumed = false
 ipcMain.handle('get-atm-secrets', () => {
   if (secretsConsumed) {
     console.warn('[Electron] SECURITY: get-atm-secrets called after secrets already consumed')
-    return { atmPrivateKey: '' }
+    return { spireSeed: '', bunkerBinding: null }
   }
   secretsConsumed = true
+  // The spire pairing seed (one-shot connect token inside) + the persisted
+  // bunker binding (transport key). The renderer resolves these into a
+  // BunkerSigner; see services/signer-resolver.ts (aiolabs/bitspire#52).
   return {
-    atmPrivateKey: process.env.VITE_ATM_PRIVATE_KEY || '',
+    spireSeed: process.env.VITE_SPIRE_SEED || '',
+    bunkerBinding: getBunkerBinding(),
   }
 })
 
+// Bunker binding persistence — the renderer writes the binding after a
+// successful pairing (connectNewSeed), and resets the bootstrap gate so the
+// new operator receives the spire's hello-event (aiolabs/bitspire#52 / #56).
+ipcMain.handle('state:save-bunker-binding', (_event, binding: StoredBunkerBinding): void => {
+  saveBunkerBinding(binding)
+})
+ipcMain.handle('state:clear-bunker-binding', (): void => {
+  clearBunkerBinding()
+})
+ipcMain.handle('state:reset-bootstrap-gate', (): void => {
+  resetBootstrapGate()
+})
+
 // State persistence IPC handlers
 ipcMain.handle('state:load-cassettes', () => loadCassettes())
 ipcMain.handle('state:set-cassettes', (_event, cassettes) => setCassettes(cassettes))

apps/machine/electron/preload.ts

@@ -42,13 +42,25 @@ export interface BrandingConfig {
   logoDarkDataUrl: string | null
 }
 
+/**
+ * Persisted NIP-46 bunker binding (mirror of state-store's StoredBunkerBinding).
+ */
+export interface BunkerBindingRecord {
+  clientSecretHex: string
+  spirePubkey: string
+  bunkerUrl: string
+  seedFingerprint: string
+  pairedAt: number
+}
+
 /**
  * ATM secrets — returned once by getAtmSecrets(), then empty on subsequent calls.
+ * The spire pairing seed (carries the one-shot connect token) plus the persisted
+ * bunker binding; the renderer resolves these into a signer.
  */
 export interface AtmSecrets {
-  atmPrivateKey: string
+  spireSeed: string
-  /** Legacy LP admin token — retained until 3d removes the LP backend. */
+  bunkerBinding: BunkerBindingRecord | null
-  adminToken?: string
 }
 
 // Expose protected methods to renderer
@@ -100,6 +112,13 @@ contextBridge.exposeInMainWorld('electronAPI', {
     ipcRenderer.invoke('state:get-bootstrap-published-at'),
   markBootstrapPublished: (unixTimestamp: number): Promise<void> =>
     ipcRenderer.invoke('state:mark-bootstrap-published', unixTimestamp),
+
+  // Bunker binding persistence (aiolabs/bitspire#52)
+  saveBunkerBinding: (binding: BunkerBindingRecord): Promise<void> =>
+    ipcRenderer.invoke('state:save-bunker-binding', binding),
+  clearBunkerBinding: (): Promise<void> => ipcRenderer.invoke('state:clear-bunker-binding'),
+  resetBootstrapGate: (): Promise<void> => ipcRenderer.invoke('state:reset-bootstrap-gate'),
+
   applyOperatorCassettesConfig: (
     payload: {
       positions: Record<string, { denomination: number; count: number }>
@@ -212,6 +231,9 @@ declare global {
       getLastKnownConfigCreatedAt: () => Promise<number>
       getBootstrapPublishedAt: () => Promise<number | null>
       markBootstrapPublished: (unixTimestamp: number) => Promise<void>
+      saveBunkerBinding: (binding: BunkerBindingRecord) => Promise<void>
+      clearBunkerBinding: () => Promise<void>
+      resetBootstrapGate: () => Promise<void>
       applyOperatorCassettesConfig: (
         payload: { positions: Record<string, { denomination: number; count: number }> },
         eventCreatedAt: number

apps/machine/electron/state-store.ts

@@ -483,6 +483,16 @@ export function clearBunkerBinding(): void {
   db.prepare('DELETE FROM bunker_binding WHERE id = 1').run()
 }
 
+/**
+ * Reset the bootstrap-publish gate so the ATM re-publishes its
+ * `bitspire-cassettes-state` hello-event. Called on a re-pair (new seed) so
+ * the new operator receives the spire's current state (aiolabs/bitspire#56).
+ */
+export function resetBootstrapGate(): void {
+  if (!db) throw new Error('Database not initialized')
+  db.prepare('UPDATE meta SET value = ? WHERE key = ?').run('', 'bootstrapPublishedAt')
+}
+
 export type OperatorCassettesPayload = {
   positions: Record<string, { denomination: number; count: number }>
 }

apps/machine/package.json

@@ -14,7 +14,7 @@
     "dev": "concurrently -n vite,electron \"vite\" \"pnpm run electron:dev\"",
     "dev:vite": "vite",
     "electron:dev": "tsc -p electron/tsconfig.json && tsc -p electron/tsconfig.preload.json && electron dist-electron/main.js",
-    "build": "vue-tsc --noEmit && vite build && tsc -p electron/tsconfig.json && tsc -p electron/tsconfig.preload.json && npx esbuild electron/fund-atm.ts --bundle --platform=node --format=cjs --outfile=dist-electron/fund-atm.bundle.cjs",
+    "build": "vue-tsc --noEmit && vite build && tsc -p electron/tsconfig.json && tsc -p electron/tsconfig.preload.json && npx esbuild electron/fund-atm.ts --bundle --platform=node --format=cjs --external:better-sqlite3 --outfile=dist-electron/fund-atm.bundle.cjs",
     "build:electron": "pnpm build && electron-builder",
     "preview": "vite preview",
     "typecheck": "vue-tsc --noEmit",

apps/machine/src/App.vue

@@ -51,14 +51,13 @@ onMounted(async () => {
     atmStore.initError = 'maintenance'
     // Publish maintenance beacon — minimal Nostr connection only (no Lightning.Pub)
     try {
-      const { NostrClient, LocalSigner, loadIdentityFromHex, createSignedEvent } = await import(
+      const { NostrClient, createSignedEvent } = await import('@bitSpire/nostr-client')
-        '@bitSpire/nostr-client'
+      const { resolveSigner } = await import('@/services/signer-resolver')
-      )
-      const secrets = isElectron ? await window.electronAPI?.getAtmSecrets() : null
-      const privKey = secrets?.atmPrivateKey || import.meta.env.VITE_ATM_PRIVATE_KEY
       const relayUrl = config?.relayUrl || import.meta.env.VITE_RELAY_URL
-      if (privKey && relayUrl) {
+      // Best-effort: resolve a signer (bunker resume / pairing, or dev nsec).
-        const signer = new LocalSigner(loadIdentityFromHex(privKey))
+      // If the ATM isn't paired yet, skip the beacon rather than fail the screen.
+      const signer = await resolveSigner({ allowEphemeral: true }).catch(() => null)
+      if (signer && relayUrl) {
         const client = new NostrClient({ relays: [{ url: relayUrl }], signer })
         await client.connect()
         const publishBeacon = async () => {

apps/machine/src/services/lightning.ts

@@ -12,14 +12,8 @@
  * the customer's invoice.
  */
 
-import {
+import { NostrClient, type Signer } from '@bitSpire/nostr-client'
-  NostrClient,
+import { resolveSigner } from './signer-resolver.js'
-  LocalSigner,
-  generateIdentity,
-  loadIdentityFromHex,
-  type Signer,
-  type MachineIdentity,
-} from '@bitSpire/nostr-client'
 import { LnbitsClient } from '@bitSpire/lnbits'
 import { CLINKClient } from '@bitSpire/clink'
 import type { OfferRequest, ManagementRequest, ManagementResponse } from '@bitSpire/clink'
@@ -39,14 +33,12 @@ const isElectron = typeof window !== 'undefined' && window.electronAPI !== undef
  *
  * Environment variables:
  * - VITE_RELAY_URL: Nostr relay WebSocket URL
- * - VITE_LIGHTNING_PUB_PUBKEY: Lightning.Pub's Nostr pubkey (hex or npub)
+ * - VITE_LNBITS_SERVER_PUBKEY: LNbits nostr-transport server pubkey (hex)
- * - VITE_LIGHTNING_PUB_API_URL: Lightning.Pub HTTP API URL
+ * - VITE_SPIRE_SEED: spire pairing seed (NIP-46 bunker); see signer-resolver.ts
- * - VITE_ATM_PRIVATE_KEY: ATM's Nostr private key (hex or nsec)   // pragma: allowlist secret
+ * - VITE_OPERATOR_PUBKEYS: comma-separated operator pubkeys (hex)
- * - VITE_ADMIN_TOKEN: Lightning.Pub admin token (dev only)
  */
 interface LightningConfig {
   relayUrl: string
-  atmPrivateKey: string
   appId: string
   operatorPubkeys: string[]
   /** LNbits nostr-transport server pubkey (hex, 64 chars). */
@@ -63,7 +55,6 @@ interface LightningConfig {
 async function loadLightningConfig(): Promise<LightningConfig> {
   const defaults: LightningConfig = {
     relayUrl: 'ws://localhost:7777',
-    atmPrivateKey: '',
     appId: '30270e761f2e30b1737f34ce661df45f521352b408b8ed18fcc09f3f0dec5097', // bitSpire ATM app ID
     operatorPubkeys: [],
     lnbitsServerPubkey: '',
@@ -72,10 +63,8 @@ async function loadLightningConfig(): Promise<LightningConfig> {
   if (isElectron && window.electronAPI) {
     try {
       const rc = await window.electronAPI.getConfig()
-      const sec = await window.electronAPI.getAtmSecrets()
       return {
         relayUrl: rc.relayUrl || defaults.relayUrl,
-        atmPrivateKey: sec.atmPrivateKey || defaults.atmPrivateKey,
         appId: rc.appId || defaults.appId,
         operatorPubkeys: rc.operatorPubkeys
           ? rc.operatorPubkeys
@@ -92,7 +81,6 @@ async function loadLightningConfig(): Promise<LightningConfig> {
 
   return {
     relayUrl: import.meta.env.VITE_RELAY_URL || defaults.relayUrl,
-    atmPrivateKey: import.meta.env.VITE_ATM_PRIVATE_KEY || defaults.atmPrivateKey,
     appId: import.meta.env.VITE_APP_ID || defaults.appId,
     lnbitsServerPubkey:
       (import.meta.env.VITE_LNBITS_SERVER_PUBKEY as string | undefined) ||
@@ -416,15 +404,14 @@ export async function initializeLightningServices(options?: {
   console.log('[Lightning] Relay URL:', CONFIG.relayUrl)
   console.log('[Lightning] LNbits server pubkey:', CONFIG.lnbitsServerPubkey || '(not configured)')
 
-  // Strict mode: validate config is production-ready (no localhost, no ephemeral identity)
+  // Strict mode: validate config is production-ready (no localhost). The
+  // signing-identity check (a bunker pairing must exist) is enforced by
+  // resolveSigner below via allowEphemeral=false.
   if (options?.strict) {
     const errors: string[] = []
     if (/localhost|127\.0\.0\.1/.test(CONFIG.relayUrl)) {
       errors.push('VITE_RELAY_URL contains localhost')
     }
-    if (!CONFIG.atmPrivateKey) {
-      errors.push('VITE_ATM_PRIVATE_KEY is not set (ephemeral identity not allowed in production)')
-    }
     if (!CONFIG.lnbitsServerPubkey) {
       errors.push('VITE_LNBITS_SERVER_PUBKEY is not set')
     }
@@ -441,22 +428,13 @@ export async function initializeLightningServices(options?: {
     )
   }
 
-  // Load or generate ATM identity
+  // Resolve the signing identity. In production this is a BunkerSigner over
-  let identity: MachineIdentity
+  // NIP-46 (the ATM holds only a transport key; the operator's nsecbunkerd
-  if (CONFIG.atmPrivateKey) {
+  // holds the signing key); in dev it falls back to an in-process LocalSigner.
-    identity = loadIdentityFromHex(CONFIG.atmPrivateKey)
+  // The Phase-A Signer seam means nothing downstream changes. See
-    console.log('[Lightning] Loaded ATM identity from config')
+  // aiolabs/bitspire#52.
-  } else {
+  const signer: Signer = await resolveSigner({ allowEphemeral: !options?.strict })
-    identity = generateIdentity()
+  console.log('[Lightning] ATM pubkey:', signer.pubkey)
-    console.warn('[Lightning] No VITE_ATM_PRIVATE_KEY configured - generated ephemeral identity')
-    console.warn('[Lightning] Set VITE_ATM_PRIVATE_KEY for persistent identity across restarts')
-  }
-  console.log('[Lightning] ATM pubkey:', identity.publicKey)
-
-  // Wrap the identity in a signer. Phase A always uses LocalSigner (in-process
-  // nsec); Phase B swaps in a BunkerSigner here without touching the call
-  // sites below. See aiolabs/bitspire#52.
-  const signer: Signer = new LocalSigner(identity)
 
   // Create Nostr client
   const nostrClient = new NostrClient({
@@ -491,7 +469,7 @@ export async function initializeLightningServices(options?: {
   // commands; it has no Lightning.Pub dependency.
   const clink = new CLINKClient({
     nostrClient,
-    identity,
+    signer,
     operatorPubkey: CONFIG.operatorPubkeys,
     relays: [CONFIG.relayUrl],
   })
@@ -581,7 +559,6 @@ export async function initializeLightningServices(options?: {
   }
 
   const atmServices = createATMServices(
-    identity,
     (preimage) => {
       if (paymentReceivedCallback) {
         paymentReceivedCallback(preimage)
@@ -624,7 +601,6 @@ export async function initializeLightningServices(options?: {
  * Create ATMServices implementation using the LNbits nostr-transport.
  */
 function createATMServices(
-  _identity: MachineIdentity,
   onPaymentSuccess: (preimage: string) => void,
   lnbits: LnbitsClient,
   lnbitsWalletId: string,

apps/machine/src/services/signer-resolver.ts

@@ -0,0 +1,116 @@
+/**
+ * Signer resolution — turns the ATM's pairing state into a live `Signer`.
+ *
+ * Three outcomes, in priority order (aiolabs/bitspire#52, model A1):
+ *  1. A seed is present whose fingerprint differs from the stored binding
+ *     (first pair or re-pair) → generate a fresh NIP-46 transport key, redeem
+ *     the one-shot connect secret, persist the binding, and reset the
+ *     bootstrap gate so the (possibly new) operator gets a hello-event (#56).
+ *  2. A seed is present matching the stored binding, OR no seed but a stored
+ *     binding exists → resume the bunker session with the persisted transport
+ *     key (no re-redeem — the binding is server-persistent).
+ *  3. Neither → ephemeral LocalSigner, dev only. In strict (production) mode
+ *     this throws instead: no pairing means no signing identity.
+ *
+ * Runs in the renderer (where the relay I/O lives); state.db reads/writes go
+ * through the one-shot get-atm-secrets channel + the binding IPC handlers.
+ */
+
+import {
+  LocalSigner,
+  connectNewSeed,
+  resumeFromBinding,
+  generateClientTransportKey,
+  generateIdentity,
+  loadIdentityFromHex,
+  parseSpireSeed,
+  seedFingerprint,
+  type Signer,
+} from '@bitSpire/nostr-client'
+import type { BunkerBindingRecord } from '@/types/electron'
+
+const isElectron = typeof window !== 'undefined' && window.electronAPI !== undefined
+
+export interface ResolveSignerOptions {
+  /** Allow an ephemeral LocalSigner when no seed/binding exists (dev only). */
+  allowEphemeral: boolean
+}
+
+interface PairingState {
+  spireSeed: string
+  binding: BunkerBindingRecord | null
+}
+
+/** Gather the seed + persisted binding from Electron, or env in browser dev. */
+async function loadPairingState(): Promise<PairingState> {
+  if (isElectron && window.electronAPI) {
+    const secrets = await window.electronAPI.getAtmSecrets()
+    return { spireSeed: secrets.spireSeed || '', binding: secrets.bunkerBinding ?? null }
+  }
+  return { spireSeed: (import.meta.env.VITE_SPIRE_SEED as string | undefined) || '', binding: null }
+}
+
+export async function resolveSigner(opts: ResolveSignerOptions): Promise<Signer> {
+  const { spireSeed, binding } = await loadPairingState()
+
+  if (spireSeed) {
+    const seed = parseSpireSeed(spireSeed)
+    const fingerprint = seedFingerprint(spireSeed)
+
+    if (binding && binding.seedFingerprint === fingerprint) {
+      console.log('[Signer] Resuming bunker session for spire', seed.spirePubkey)
+      return resumeFromBinding({
+        clientSecretHex: binding.clientSecretHex,
+        spirePubkey: binding.spirePubkey,
+        bunkerUrl: binding.bunkerUrl,
+      })
+    }
+
+    // First pair or re-pair: redeem the one-shot connect secret.
+    console.log('[Signer] Pairing to bunker for spire', seed.spirePubkey)
+    const transport = generateClientTransportKey()
+    const signer = await connectNewSeed({
+      spirePubkey: seed.spirePubkey,
+      bunkerUrl: seed.bunkerUrl,
+      clientSecretHex: transport.secretHex,
+    })
+    if (isElectron && window.electronAPI) {
+      await window.electronAPI.saveBunkerBinding({
+        clientSecretHex: transport.secretHex,
+        spirePubkey: seed.spirePubkey,
+        bunkerUrl: seed.bunkerUrl,
+        seedFingerprint: fingerprint,
+        pairedAt: Math.floor(Date.now() / 1000),
+      })
+      // Re-pair → re-publish the cassette-state hello to the new operator (#56).
+      await window.electronAPI.resetBootstrapGate()
+    }
+    return signer
+  }
+
+  // No seed in this boot but a binding survives → resume.
+  if (binding) {
+    console.log('[Signer] Resuming bunker session from stored binding (no seed this boot)')
+    return resumeFromBinding({
+      clientSecretHex: binding.clientSecretHex,
+      spirePubkey: binding.spirePubkey,
+      bunkerUrl: binding.bunkerUrl,
+    })
+  }
+
+  if (opts.allowEphemeral) {
+    // Dev-only: a hex key gives a stable dev identity; otherwise ephemeral.
+    const devKey = !isElectron ? (import.meta.env.VITE_ATM_PRIVATE_KEY as string | undefined) : ''
+    if (devKey) {
+      console.warn('[Signer] No bunker pairing — using LocalSigner from VITE_ATM_PRIVATE_KEY (dev)')
+      return new LocalSigner(loadIdentityFromHex(devKey))
+    }
+    console.warn('[Signer] No bunker pairing — generated ephemeral LocalSigner (dev only)')
+    return new LocalSigner(generateIdentity())
+  }
+
+  throw new Error(
+    '[Signer] No spire seed and no bunker binding — cannot resolve a signing identity (strict mode). ' +
+      'Set VITE_SPIRE_SEED or pair the ATM.'
+  )
+}

apps/machine/src/types/electron.d.ts

@@ -39,10 +39,20 @@ export interface BrandingConfig {
   logoDarkDataUrl: string | null
 }
 
+/** Persisted NIP-46 bunker binding (mirror of state-store's StoredBunkerBinding). */
+export interface BunkerBindingRecord {
+  clientSecretHex: string
+  spirePubkey: string
+  bunkerUrl: string
+  seedFingerprint: string
+  pairedAt: number
+}
+
 export interface AtmSecrets {
-  atmPrivateKey: string
+  /** Spire pairing seed URL (`spire-seed:v1:…`); carries the one-shot connect token. */
-  /** Legacy LP admin token — retained until 3d removes the LP backend. */
+  spireSeed: string
-  adminToken?: string
+  /** Persisted bunker binding, or null when the ATM is unpaired. */
+  bunkerBinding: BunkerBindingRecord | null
 }
 
 declare global {
@@ -85,6 +95,9 @@ declare global {
       getLastKnownConfigCreatedAt: () => Promise<number>
       getBootstrapPublishedAt: () => Promise<number | null>
       markBootstrapPublished: (unixTimestamp: number) => Promise<void>
+      saveBunkerBinding: (binding: BunkerBindingRecord) => Promise<void>
+      clearBunkerBinding: () => Promise<void>
+      resetBootstrapGate: () => Promise<void>
       applyOperatorCassettesConfig: (
         payload: { positions: Record<string, { denomination: number; count: number }> },
         eventCreatedAt: number

packages/clink/src/client.ts

@@ -10,34 +10,30 @@
  * Uses NIP-44v2 encryption for all messages.
  */
 
-import type { Event, UnsignedEvent } from 'nostr-tools'
+import type { Event, EventTemplate } from 'nostr-tools'
-import { finalizeEvent } from 'nostr-tools'
+import type { NostrClient, Signer } from '@bitSpire/nostr-client'
-import type { MachineIdentity, NostrClient } from '@bitSpire/nostr-client'
-import { encryptContentV2, decryptContentV2 } from '@bitSpire/nostr-client'
 
 /** CLINK protocol version tag (mandatory per CLINK spec) */
 const CLINK_VERSION_TAG: [string, string] = ['clink_version', '1']
 
 /**
- * Encrypt content using NIP-44 v2 (required for CLINK events)
+ * Encrypt content using NIP-44 v2 (required for CLINK events).
+ * Routes through the Signer so the spire identity can live in a bunker.
  */
-function encryptCLINK(
+function encryptCLINK(signer: Signer, recipientPubkey: string, content: unknown): Promise<string> {
-  identity: MachineIdentity,
+  const plaintext = typeof content === 'string' ? content : JSON.stringify(content)
-  recipientPubkey: string,
+  return signer.nip44Encrypt(recipientPubkey, plaintext)
-  content: unknown
-): string {
-  return encryptContentV2(identity, recipientPubkey, content)
 }
 
 /**
- * Decrypt and parse JSON content using NIP-44 v2
+ * Decrypt and parse JSON content using NIP-44 v2.
  */
-function decryptCLINKJSON<T = unknown>(
+async function decryptCLINKJSON<T = unknown>(
-  identity: MachineIdentity,
+  signer: Signer,
   senderPubkey: string,
   ciphertext: string
-): T {
+): Promise<T> {
-  const plaintext = decryptContentV2(identity, senderPubkey, ciphertext)
+  const plaintext = await signer.nip44Decrypt(senderPubkey, ciphertext)
   return JSON.parse(plaintext) as T
 }
 import {
@@ -67,8 +63,8 @@ import { encodeNoffer, decodeNoffer } from './noffer.js'
 export interface CLINKClientOptions {
   /** Nostr client for communication */
   nostrClient: NostrClient
-  /** Machine identity */
+  /** Signer for the spire identity (local nsec or remote bunker) */
-  identity: MachineIdentity
+  signer: Signer
   /** Operator pubkey(s) for management commands */
   operatorPubkey: string | string[]
   /** Relays to use for offers */
@@ -102,7 +98,7 @@ export type ManagementHandler = (
  */
 export class CLINKClient {
   private nostrClient: NostrClient
-  private identity: MachineIdentity
+  private signer: Signer
   private operatorPubkeys: string[]
   private relays: string[]
   private generateInvoice?: GenerateInvoice
@@ -120,7 +116,7 @@ export class CLINKClient {
 
   constructor(options: CLINKClientOptions) {
     this.nostrClient = options.nostrClient
-    this.identity = options.identity
+    this.signer = options.signer
     this.operatorPubkeys = Array.isArray(options.operatorPubkey)
       ? options.operatorPubkey
       : [options.operatorPubkey]
@@ -144,7 +140,7 @@ export class CLINKClient {
     currency?: string
   }): string {
     const offer: CLINKOffer = {
-      pubkey: this.identity.publicKey,
+      pubkey: this.signer.pubkey,
       relays: this.relays,
       priceType: options.priceType,
       offerId: options.offerId,
@@ -193,7 +189,7 @@ export class CLINKClient {
       [
         {
           kinds: [CLINKEventKind.Offer, CLINKEventKind.Debit, CLINKEventKind.Manage],
-          '#p': [this.identity.publicKey],
+          '#p': [this.signer.pubkey],
         },
       ],
       {
@@ -234,9 +230,9 @@ export class CLINKClient {
       expires_in_seconds: options?.expiresInSeconds,
     }
 
-    const content = encryptCLINK(this.identity, offer.pubkey, request)
+    const content = await encryptCLINK(this.signer, offer.pubkey, request)
 
-    const event = this.createSignedEvent({
+    const event = await this.createSignedEvent({
       kind: CLINKEventKind.Offer,
       content,
       tags: [['p', offer.pubkey], CLINK_VERSION_TAG],
@@ -269,9 +265,9 @@ export class CLINKClient {
       description: options?.description,
     }
 
-    const content = encryptCLINK(this.identity, targetPubkey, request)
+    const content = await encryptCLINK(this.signer, targetPubkey, request)
 
-    const event = this.createSignedEvent({
+    const event = await this.createSignedEvent({
       kind: CLINKEventKind.Debit,
       content,
       tags: [['p', targetPubkey], CLINK_VERSION_TAG],
@@ -303,9 +299,9 @@ export class CLINKClient {
       description: options?.description,
     }
 
-    const content = encryptCLINK(this.identity, targetPubkey, request)
+    const content = await encryptCLINK(this.signer, targetPubkey, request)
 
-    const event = this.createSignedEvent({
+    const event = await this.createSignedEvent({
       kind: CLINKEventKind.Debit,
       content,
       tags: [['p', targetPubkey], CLINK_VERSION_TAG],
@@ -324,9 +320,9 @@ export class CLINKClient {
     targetPubkey: string,
     request: ManagementRequest
   ): Promise<ManagementResponse> {
-    const content = encryptCLINK(this.identity, targetPubkey, request)
+    const content = await encryptCLINK(this.signer, targetPubkey, request)
 
-    const event = this.createSignedEvent({
+    const event = await this.createSignedEvent({
       kind: CLINKEventKind.Manage,
       content,
       tags: [['p', targetPubkey], CLINK_VERSION_TAG],
@@ -394,15 +390,15 @@ export class CLINKClient {
       return
     }
 
-    const request = decryptCLINKJSON<OfferRequest>(this.identity, event.pubkey, event.content)
+    const request = await decryptCLINKJSON<OfferRequest>(this.signer, event.pubkey, event.content)
 
     const response = await this.offerHandler(request, event.pubkey)
     if (!response) return
 
     // Send encrypted response with clink_version tag
-    const content = encryptCLINK(this.identity, event.pubkey, response)
+    const content = await encryptCLINK(this.signer, event.pubkey, response)
 
-    const responseEvent = this.createSignedEvent({
+    const responseEvent = await this.createSignedEvent({
       kind: CLINKEventKind.Offer,
       content,
       tags: [['p', event.pubkey], ['e', event.id], CLINK_VERSION_TAG],
@@ -425,14 +421,14 @@ export class CLINKClient {
       return
     }
 
-    const request = decryptCLINKJSON<DebitRequest>(this.identity, event.pubkey, event.content)
+    const request = await decryptCLINKJSON<DebitRequest>(this.signer, event.pubkey, event.content)
 
     const response = await this.debitHandler(request, event.pubkey)
 
     // Send encrypted response with clink_version tag
-    const content = encryptCLINK(this.identity, event.pubkey, response)
+    const content = await encryptCLINK(this.signer, event.pubkey, response)
 
-    const responseEvent = this.createSignedEvent({
+    const responseEvent = await this.createSignedEvent({
       kind: CLINKEventKind.Debit,
       content,
       tags: [['p', event.pubkey], ['e', event.id], CLINK_VERSION_TAG],
@@ -491,15 +487,15 @@ export class CLINKClient {
       if (first) this.processedManageEvents.delete(first)
     }
 
-    const request = decryptCLINKJSON<ManagementRequest>(this.identity, event.pubkey, event.content)
+    const request = await decryptCLINKJSON<ManagementRequest>(this.signer, event.pubkey, event.content)
 
     const response = await this.managementHandler(request, event.pubkey)
     if (!response) return
 
     // Send encrypted response with clink_version tag
-    const content = encryptCLINK(this.identity, event.pubkey, response)
+    const content = await encryptCLINK(this.signer, event.pubkey, response)
 
-    const responseEvent = this.createSignedEvent({
+    const responseEvent = await this.createSignedEvent({
       kind: CLINKEventKind.Manage,
       content,
       tags: [['p', event.pubkey], ['e', event.id], CLINK_VERSION_TAG],
@@ -524,7 +520,7 @@ export class CLINKClient {
           {
             kinds: [kind],
             authors: [fromPubkey],
-            '#p': [this.identity.publicKey],
+            '#p': [this.signer.pubkey],
             '#e': [requestEventId],
             since: Math.floor(Date.now() / 1000) - 5,
           },
@@ -540,12 +536,7 @@ export class CLINKClient {
 
             clearTimeout(timeout)
             this.nostrClient.unsubscribe(subId)
-            try {
+            decryptCLINKJSON<T>(this.signer, fromPubkey, event.content).then(resolve).catch(reject)
-              const response = decryptCLINKJSON<T>(this.identity, fromPubkey, event.content)
-              resolve(response)
-            } catch (e) {
-              reject(e)
-            }
           },
         }
       )
@@ -553,11 +544,11 @@ export class CLINKClient {
   }
 
   /**
-   * Create a signed event
+   * Create a signed event via the signer (sets pubkey/id/sig). Async because
+   * a BunkerSigner is a relay round-trip.
    */
-  private createSignedEvent(event: Omit<UnsignedEvent, 'pubkey'>): Event {
+  private createSignedEvent(template: EventTemplate): Promise<Event> {
-    // finalizeEvent derives pubkey from the secret key
+    return this.signer.signEvent(template)
-    return finalizeEvent(event, this.identity.privateKey)
   }
 }
 

packages/nostr-client/src/bunker-signer.ts

@@ -29,9 +29,11 @@ import type { Signer } from './signer.js'
 const DEFAULT_BUNKER_TIMEOUT_MS = 10_000
 
 /**
- * Raised when the bunker actively rejects a request (e.g. the operator
+ * Raised when the bunker actively rejects a request. Post-bind causes
- * revoked the spire's binding, or a kind/method is outside the policy).
+ * (nsecbunkerd#27, sign-time lifecycle enforcement): the operator revoked the
- * Callers should treat this as "unpaired" and surface a re-pair prompt.
+ * binding (`KeyUser`/`Token.revokedAt`), the token's TTL (`expiresAt`) lapsed,
+ * or the requested kind/method is outside the policy. Callers should treat
+ * this as "unpaired" and surface a re-pair prompt.
  */
 export class BunkerRejectedError extends Error {
   constructor(message: string) {