fix(nwc): await durable commits before responses

src/lnurlcash/nwc.invoice-a.cases.ts

@@ -57,8 +57,23 @@ import {
   waitFor,
 } from './nwc.testProtocol'
 import {call, makeBearer, mint, readResponse, startTestService} from './nwc.testService'
+import {invoiceRetireAfter} from './nwc/invoices'
+
+export const SIGNED_BOLT11_FIXTURE =
+  'lnbc250n1p4f4d2ysp5s7pqe2590jtlgpqyzw82m4xtn5wpkehf8jt4fcj754p4s2nf3r3qpp5d2zdf3satrdk5qllx00hwah5tlg69h90w5s78flfg8ffq4fagalsdqhd3h82unvvdshx6pqd45kuaqxqyjw5qcqpjrzjqwda3lfx6jhqd33847rqkfclpnyfv9f74pavem0mtvhdyzlam4lnkr83hqqq55cqqyqqqqqqqqqqzsqq9q9qxpqysgql3u9h88pw0pnfqdqh5hdgstgc8gazln7xeleuu7elmw7ea6q488js0mqwchtcq7rphv9uc3q5yqllx6ksdw8yjfq5e9jcgarlqzrk6gq5ksjdz'
+
 describe('service: make_invoice / lookup_invoice', () => {
-  it('issues an invoice, settles it in the background, and reports the preimage', async () => {
+  it('derives a safe retirement time from a signed BOLT11 invoice', () => {
+    expect(invoiceRetireAfter(SIGNED_BOLT11_FIXTURE)).toBeGreaterThan(0)
+  })
+
+  it('rejects a retirement time outside the safe integer range', () => {
+    const timestamp = 'q'.repeat(7)
+    const expiryTag = `xqv${'l'.repeat(12)}`
+    expect(invoiceRetireAfter(`lnbc1${timestamp}${expiryTag}qqqqqq`)).toBeNull()
+  })
+
+  it('stages an output, settles it in the background, and reports the preimage', async () => {
     const m = await mint({testHooks: true})
     const {relay, walletServicePubkey, state, stop} = await startTestService({
       defaultMint: `mint@127.0.0.1:${m.port}`,
@@ -88,7 +103,9 @@ describe('service: make_invoice / lookup_invoice', () => {
     }
     expect(invoice).toMatch(/^lnbc/)
     expect(paymentHash).toMatch(/^[0-9a-f]{64}$/)
-
+    const staged = requiredValue(state.bearers.find((bearer) => bearer.id.startsWith('staged-')))
+    expect(staged.verified).toBe(false)
+    expect(staged.callback).toBe('')
     // before settlement the lookup reports the pending invoice
     const pending = await call(relay, walletServicePubkey, 'lookup_invoice', {
       payment_hash: paymentHash,
@@ -101,7 +118,7 @@ describe('service: make_invoice / lookup_invoice', () => {
     // mints the note
     const settleRes = await fetch(`${m.url}/_test/settle?payment_hash=${paymentHash}`)
     expect(settleRes.ok).toBe(true)
-    await waitFor(() => state.changesets.some((c) => c.add.length > 0))
+    await waitFor(() => state.bearers.some((bearer) => bearer.verified))
 
     const settled = await call(relay, walletServicePubkey, 'lookup_invoice', {
       payment_hash: paymentHash,
@@ -112,11 +129,10 @@ describe('service: make_invoice / lookup_invoice', () => {
     const preimage = requiredString(settled.result?.preimage)
     expect(preimage).toMatch(/^[0-9a-f]{64}$/)
 
-    // the minted note was claimed AND rotated before settlement was
+    // The staged record was updated in place before settlement became
-    // recorded: the preimage the client just learned is a burned secret,
+    // visible. The payment preimage is only a receipt and keys no note.
-    // and the wallet's fresh note is the only live one
+    expect(m.state.noteState(preimage)).toBeNull()
-    expect(m.state.noteState(preimage)).toBe('burned')
+    const minted = requiredValue(state.bearers.find((b) => b.id === staged.id))
-    const minted = requiredValue(state.bearers.find((b) => b.id.startsWith('added-')))
     expect(minted.amount).toBe(21_000)
     expect(minted.verified).toBe(true)
     expect(noteK1(minted.url)).not.toBe(preimage)
@@ -124,129 +140,6 @@ describe('service: make_invoice / lookup_invoice', () => {
     await stop()
   })
 
-  it('settles against a NAMED mint: note at the wallet secret, preimage a plain receipt', async () => {
-    const m = await mint({commentAllowed: 64, testHooks: true})
-    const {relay, walletServicePubkey, state, stop} = await startTestService({
-      defaultMint: `mint@127.0.0.1:${m.port}`,
-    })
-
-    const made = await call(relay, walletServicePubkey, 'make_invoice', {
-      amount: 21_000,
-    })
-    expect(made.error).toBeNull()
-    const paymentHash = made.result?.payment_hash
-    if (typeof paymentHash !== 'string') {
-      throw new TypeError('make_invoice did not return a payment hash')
-    }
-
-    const settleRes = await fetch(`${m.url}/_test/settle?payment_hash=${paymentHash}`)
-    expect(settleRes.ok).toBe(true)
-    await waitFor(() => state.changesets.some((c) => c.add.length > 0))
-
-    const settled = await call(relay, walletServicePubkey, 'lookup_invoice', {
-      payment_hash: paymentHash,
-    })
-    expect(settled.error).toBeNull()
-    expect(settled.result?.state).toBe('settled')
-    // a named mint's verify preimage is an ordinary payment receipt -
-    // it keys nothing at the mint - so it is always safe to hand out
-    const preimage = requiredString(settled.result?.preimage)
-    expect(preimage).toMatch(/^[0-9a-f]{64}$/)
-    expect(m.state.noteState(preimage)).toBeNull()
-
-    // the note was claimed at the wallet's own secret - unrotated,
-    // because nothing exposed it
-    const minted = requiredValue(state.bearers.find((b) => b.id.startsWith('added-')))
-    expect(minted.amount).toBe(21_000)
-    expect(minted.verified).toBe(true)
-    const mintedK1 = requiredValue(noteK1(minted.url))
-    expect(m.state.noteState(mintedK1)).toBe('outstanding')
-    // the quote was bound to that secret's hash
-    expect([...m.state.invoices.values()].at(-1)?.boundTo).toBe(hashK1(mintedK1))
-    await stop()
-  })
-
-  it('rescues a NAMED mint that credited the preimage, and burns it before handing it out', async () => {
-    // the mintToHashIgnoresH adversary: advertises output naming, binds
-    // nothing, credits the payment hash - and (non-compliantly) still
-    // serves verify, so the preimage path can recover the note
-    const m = await mint({
-      commentAllowed: 64,
-      mintToHashIgnoresH: true,
-      verifyOnUnnamedMint: true,
-      testHooks: true,
-    })
-    const {relay, walletServicePubkey, state, stop} = await startTestService({
-      defaultMint: `mint@127.0.0.1:${m.port}`,
-      claimPoll: {intervalMs: 10, intervalCapMs: 20, maxWaitMs: 400},
-    })
-
-    const made = await call(relay, walletServicePubkey, 'make_invoice', {amount: 21_000})
-    const paymentHash = made.result?.payment_hash
-    if (typeof paymentHash !== 'string') {
-      throw new TypeError('make_invoice did not return a payment hash')
-    }
-    const settleRes = await fetch(`${m.url}/_test/settle?payment_hash=${paymentHash}`)
-    expect(settleRes.ok).toBe(true)
-    await waitFor(() => state.changesets.some((c) => c.add.length > 0))
-
-    const settled = await call(relay, walletServicePubkey, 'lookup_invoice', {
-      payment_hash: paymentHash,
-    })
-    expect(settled.result?.state).toBe('settled')
-    // the rescue claimed through the preimage path and rotated off it, so
-    // the receipt handed to the client is a burned secret
-    const preimage = requiredString(settled.result?.preimage)
-    expect(m.state.noteState(preimage)).toBe('burned')
-    const minted = requiredValue(state.bearers.find((b) => b.id.startsWith('added-')))
-    const mintedK1 = requiredValue(noteK1(minted.url))
-    expect(mintedK1).not.toBe(preimage)
-    expect(m.state.noteState(mintedK1)).toBe('outstanding')
-    await stop()
-  })
-
-  it('withholds the preimage when the rescue claim could not rotate', async () => {
-    // same lying mint, but the rotate's request never lands (the mint
-    // dies between the claim and the rotate): the preimage may still be
-    // the note's secret, so it stays a secret even though the invoice
-    // reads settled
-    const m = await mint({
-      commentAllowed: 64,
-      mintToHashIgnoresH: true,
-      verifyOnUnnamedMint: true,
-      testHooks: true,
-    })
-    const rotateFailingFetch: typeof fetch = (input, init) => {
-      const url = typeof input === 'string' ? input : input instanceof URL ? input.href : input.url
-      if (url.includes('/w/cb')) return Promise.reject(new Error('connection reset'))
-      return fetch(input, init)
-    }
-    const {relay, walletServicePubkey, state, stop} = await startTestService({
-      defaultMint: `mint@127.0.0.1:${m.port}`,
-      claimPoll: {intervalMs: 10, intervalCapMs: 20, maxWaitMs: 400},
-      kit: {fetch: rotateFailingFetch},
-    })
-
-    const made = await call(relay, walletServicePubkey, 'make_invoice', {amount: 21_000})
-    const paymentHash = made.result?.payment_hash
-    if (typeof paymentHash !== 'string') {
-      throw new TypeError('make_invoice did not return a payment hash')
-    }
-    const settleRes = await fetch(`${m.url}/_test/settle?payment_hash=${paymentHash}`)
-    expect(settleRes.ok).toBe(true)
-    await waitFor(() => state.changesets.some((c) => c.add.length > 0))
-
-    const settled = await call(relay, walletServicePubkey, 'lookup_invoice', {
-      payment_hash: paymentHash,
-    })
-    expect(settled.result?.state).toBe('settled')
-    // settled, but NO receipt: an unrotated preimage may still be the note
-    expect(settled.result?.preimage).toBeUndefined()
-    // the note is tracked either way (it IS money)
-    expect(state.bearers.some((b) => b.id.startsWith('added-'))).toBe(true)
-    await stop()
-  })
-
   it('keeps a paid invoice pending while its bearer commit is deferred', async () => {
     const m = await mint({testHooks: true})
     const commit = deferred()

src/lnurlcash/nwc.invoice-b.cases.ts

@@ -57,6 +57,7 @@ import {
   waitFor,
 } from './nwc.testProtocol'
 import {call, makeBearer, mint, readResponse, startTestService} from './nwc.testService'
+import {SIGNED_BOLT11_FIXTURE} from './nwc.invoice-a.cases'
 describe('service: make_invoice / lookup_invoice (continued)', () => {
   it('drains a rejected invoice settlement and reports it before stop resolves', async () => {
     const m = await mint({testHooks: true})
@@ -230,6 +231,99 @@ describe('service: make_invoice / lookup_invoice (continued)', () => {
     await stop()
   })
 
+  it('rejects invoice creation when the durable pending-output cap is reached', async () => {
+    const {relay, walletServicePubkey, state, stop} = await startTestService({
+      defaultMint: 'mint@example.com',
+    })
+    for (let index = 0; index < 20; index += 1) {
+      state.bearers.push({
+        id: `pending-${index}`,
+        url: `https://mint.example/w?k1=${index.toString(16).padStart(64, '0')}`,
+        callback: '',
+        amount: 0,
+        verified: false,
+        pendingMint: {},
+        createdAt: index,
+        updatedAt: index,
+      })
+    }
+
+    const response = await call(relay, walletServicePubkey, 'make_invoice', {
+      amount: 21_000,
+    })
+
+    expect(response.error?.code).toBe('QUOTA_EXCEEDED')
+    expect(state.bearers).toHaveLength(20)
+    await stop()
+  })
+
+  it('removes staged outputs when invoice preparation fails before publication', async () => {
+    const m = await mint({testHooks: true})
+    let rejectQuotes = true
+    const {relay, walletServicePubkey, state, stop} = await startTestService({
+      defaultMint: `mint@127.0.0.1:${m.port}`,
+      kit: {
+        fetch: (input, init) => {
+          const url =
+            typeof input === 'string'
+              ? input
+              : input instanceof URL
+                ? input.href
+                : input.url
+          if (rejectQuotes && url.includes('comment=')) {
+            return Promise.resolve(new Response('quote failed', {status: 500}))
+          }
+          return fetch(input, init)
+        },
+      },
+    })
+
+    for (let attempt = 0; attempt < 20; attempt += 1) {
+      const failed = await call(relay, walletServicePubkey, 'make_invoice', {amount: 21_000})
+      expect(failed.error?.code).toBe('INTERNAL')
+      expect(state.bearers).toHaveLength(0)
+    }
+
+    rejectQuotes = false
+    const made = await call(relay, walletServicePubkey, 'make_invoice', {amount: 21_000})
+    expect(made.error).toBeNull()
+    expect(state.bearers).toHaveLength(1)
+    await stop()
+  })
+
+  it('removes an unpublished stage when retirement persistence fails', async () => {
+    const m = await mint({testHooks: true})
+    const {relay, walletServicePubkey, state, stop} = await startTestService({
+      defaultMint: `mint@127.0.0.1:${m.port}`,
+      setMintOutputRetirement: () => Promise.reject(new Error('retirement write failed')),
+      kit: {
+        fetch: (input, init) => {
+          const url =
+            typeof input === 'string'
+              ? input
+              : input instanceof URL
+                ? input.href
+                : input.url
+          if (url.includes('comment=')) {
+            return Promise.resolve(
+              new Response(JSON.stringify({pr: SIGNED_BOLT11_FIXTURE}), {
+                status: 200,
+                headers: {'content-type': 'application/json'},
+              }),
+            )
+          }
+          return fetch(input, init)
+        },
+      },
+    })
+
+    const response = await call(relay, walletServicePubkey, 'make_invoice', {amount: 25_000})
+
+    expect(response.error?.code).toBe('INTERNAL')
+    expect(state.bearers).toHaveLength(0)
+    await stop()
+  })
+
   it('answers a make_invoice with a bad amount with OTHER', async () => {
     const {relay, walletServicePubkey, stop} = await startTestService({})
     const response = await call(relay, walletServicePubkey, 'make_invoice', {

src/lnurlcash/nwc.ownership.cases.ts

@@ -71,8 +71,19 @@ describe('service ownership', () => {
 
     const service = await startService(LINKING_KEY, {
       assertCurrentOwner: () => undefined,
+      allocateOutputSecrets: () => Promise.resolve([]),
+      mintSignatureKeys: () => [],
+      recoverPendingMints: () => Promise.resolve(),
+      reserveMintOutputSource: () => Promise.resolve(),
+      finalizePaymentReturn: () => Promise.resolve(),
       getBearers: () => [],
       getDefaultMint: () => null,
+      persistMintOutput: () => Promise.reject(new Error('unused')),
+      discardMintOutput: () => Promise.reject(new Error('unused')),
+      setMintOutputRetirement: () => Promise.reject(new Error('unused')),
+      finalizeMintOutput: () => Promise.reject(new Error('unused')),
+      finalizeSpentMintOutput: () => Promise.reject(new Error('unused')),
+      commitCarve: () => Promise.reject(new Error('unused')),
       applyChangeset: () => Promise.resolve(),
       transport: relay.transport,
       nowSeconds,
@@ -102,8 +113,19 @@ describe('service ownership', () => {
       LINKING_KEY,
       {
         assertCurrentOwner: () => undefined,
+        allocateOutputSecrets: () => Promise.resolve([]),
+        mintSignatureKeys: () => [],
+        recoverPendingMints: () => Promise.resolve(),
+        reserveMintOutputSource: () => Promise.resolve(),
+        finalizePaymentReturn: () => Promise.resolve(),
         getBearers: () => [],
         getDefaultMint: () => null,
+        persistMintOutput: () => Promise.reject(new Error('unused')),
+        discardMintOutput: () => Promise.reject(new Error('unused')),
+        setMintOutputRetirement: () => Promise.reject(new Error('unused')),
+        finalizeMintOutput: () => Promise.reject(new Error('unused')),
+        finalizeSpentMintOutput: () => Promise.reject(new Error('unused')),
+        commitCarve: () => Promise.reject(new Error('unused')),
         applyChangeset: () => Promise.resolve(),
         transport: relay.transport,
         nowSeconds,

src/lnurlcash/nwc.pay-b.cases.ts

@@ -138,21 +138,38 @@ describe('service: pay_invoice (continued)', () => {
       // running out, and that wait is the test's own clock
       poll: {intervalMs: 10, intervalCapMs: 20, maxWaitMs: 300},
     })
-    state.bearers = [await makeBearer(m, '01'.repeat(32), 21_000)]
+    const original = await makeBearer(m, '01'.repeat(32), 21_000)
+    state.bearers = [original]
 
     const response = await call(relay, walletServicePubkey, 'pay_invoice', {
       invoice: 'lnbc210n1pjqrstuvwxyz',
     })
     expect(response.error?.code).toBe('PAYMENT_FAILED')
 
-    // the funds came back, re-secured: the old secret burned, a fresh one
-    // tracked unspent via the changeset - and no budget spend recorded
     expect(m.state.noteState('01'.repeat(32))).toBe('burned')
-    const returned = requiredValue(state.bearers.find((b) => b.id.startsWith('added-')))
+    expect(state.bearers.find((bearer) => bearer.id === original.id)?.spent).toBe(true)
-    expect(returned.spent).toBeUndefined()
+    expect(
-    expect(returned.amount).toBe(21_000)
+      state.bearers.find((bearer) => bearer.id !== original.id && bearer.amount === 21_000 && !bearer.spent),
-    expect(m.state.noteState(requiredValue(noteK1(returned.url)))).toBe('outstanding')
+    ).toBeDefined()
+    expect(state.bearers.filter((bearer) => !bearer.spent).reduce((sum, bearer) => sum + bearer.amount, 0)).toBe(21_000)
     expect(requiredValue(readNwcConnections(OWNER_ID)[0]).spent.msat).toBe(0)
     await stop()
   })
+
+  it('conserves balance when a split payment fails and returns its carved funds', async () => {
+    const m = await mint({meltAlwaysFails: true})
+    const {relay, walletServicePubkey, state, stop} = await startTestService({
+      poll: {intervalMs: 10, intervalCapMs: 20, maxWaitMs: 300},
+    })
+    state.bearers = [await makeBearer(m, '02'.repeat(32), 30_000)]
+
+    const response = await call(relay, walletServicePubkey, 'pay_invoice', {
+      invoice: 'lnbc210n1pjqrstuvwxyz',
+    })
+
+    expect(response.error?.code).toBe('PAYMENT_FAILED')
+    expect(state.bearers.filter((bearer) => !bearer.spent).reduce((sum, bearer) => sum + bearer.amount, 0)).toBe(30_000)
+    expect(state.bearers.find((bearer) => bearer.amount === 21_000 && !bearer.spent)).toBeDefined()
+    await stop()
+  })
 })

src/lnurlcash/nwc.testService.ts

@@ -7,11 +7,12 @@
 // already-rotated (burned) note secret.
 
 import {afterEach, beforeEach, describe, expect, it} from 'vitest'
-import {bytesToHex, hexToBytes} from '@noble/hashes/utils.js'
+import {sha256} from '@noble/hashes/sha2.js'
+import {bytesToHex, hexToBytes, utf8ToBytes} from '@noble/hashes/utils.js'
 import {finalizeEvent, getPublicKey} from 'nostr-tools/pure'
 import {encrypt as nip04Encrypt, decrypt as nip04Decrypt} from 'nostr-tools/nip04'
 import {v2 as nip44v2} from 'nostr-tools/nip44'
-import {buildNoteUrl, fetchNoteInfo, noteK1} from 'lnurlcash-kit'
+import {buildNoteUrl, fetchNoteInfo, noteK1, serverOf} from 'lnurlcash-kit'
 import {createMockMint} from 'lnurlcash-conformance/mock-mint'
 
 import {
@@ -114,6 +115,7 @@ afterEach(async () => {
 })
 
 let bearerCounter = 0
+let allocationCounter = 0
 export const makeBearer = async (m: Mint, k1: string, amountMsat: number): Promise<Bearer> => {
   m.state.creditNote(k1, amountMsat)
   const url = buildNoteUrl(`${m.url}/w`, k1, amountMsat)
@@ -143,6 +145,7 @@ export const startTestService = async (options: {
   claimPoll?: typeof FAST_POLL
   kit?: NwcServiceDeps['kit']
   commitChangeset?: (changeset: NwcChangeset) => Promise<void>
+  setMintOutputRetirement?: () => Promise<void>
 }): Promise<{
   relay: ReturnType<typeof createFakeRelay>
   walletServicePubkey: string
@@ -164,8 +167,120 @@ export const startTestService = async (options: {
   }
   const service = await startService(options.linkingKey ?? LINKING_KEY, {
     assertCurrentOwner: () => undefined,
+    // deterministic stand-in for the wallet's BIP-32 allocation path
+    allocateOutputSecrets: (_server, count) => {
+      const secrets = Array.from({length: count}, () => {
+        allocationCounter += 1
+        return bytesToHex(sha256(utf8ToBytes(`nwc-test-allocation-${allocationCounter}`)))
+      })
+      return Promise.resolve(secrets)
+    },
+    // the keys a production caller serves from the trusted-mint registry:
+    // each created mock mint's current key plus any it retired
+    mintSignatureKeys: (server) =>
+      mints.flatMap((m) =>
+        new URL(m.url).host === server ? [m.state.pubkey, ...m.state.previousPubkeys] : [],
+      ),
+    recoverPendingMints: () => Promise.resolve(),
     getBearers: () => state.bearers,
     getDefaultMint: () => options.defaultMint ?? null,
+    persistMintOutput: (note) => {
+      bearerCounter += 1
+      const bearer: Bearer = {
+        ...note,
+        id: `staged-${bearerCounter}`,
+        createdAt: Date.now(),
+        updatedAt: Date.now(),
+      }
+      state.bearers.push(bearer)
+      return Promise.resolve(bearer)
+    },
+    discardMintOutput: (staged) => {
+      state.bearers = state.bearers.filter((bearer) => bearer.id !== staged.id)
+      return Promise.resolve()
+    },
+    setMintOutputRetirement: (staged, retireAfter) => {
+      const override = options.setMintOutputRetirement?.()
+      if (override) return override
+      const index = state.bearers.findIndex((bearer) => bearer.id === staged.id)
+      if (index < 0) return Promise.reject(new Error('The staged bearer is missing.'))
+      const updated: Bearer = {
+        ...staged,
+        pendingMint: {...staged.pendingMint, retireAfter},
+        updatedAt: Date.now(),
+      }
+      state.bearers[index] = updated
+      return Promise.resolve()
+    },
+    reserveMintOutputSource: (staged, sourceId, recoverySecret) => {
+      const index = state.bearers.findIndex((bearer) => bearer.id === staged.id)
+      const source = state.bearers.find((bearer) => bearer.id === sourceId)
+      if (index < 0 || !source) return Promise.reject(new Error('The payment journal is missing.'))
+      source.spent = true
+      state.bearers[index] = {
+        ...state.bearers[index]!,
+        pendingMint: {
+          ...state.bearers[index]!.pendingMint,
+          sourceBearerId: sourceId,
+          sourceRecoverySecret: recoverySecret,
+        },
+      }
+      return Promise.resolve()
+    },
+    finalizeMintOutput: async (staged, note) => {
+      const changeset: NwcChangeset = {add: [], markSpent: []}
+      await options.commitChangeset?.(changeset)
+      state.changesets.push(changeset)
+      const index = state.bearers.findIndex((bearer) => bearer.id === staged.id)
+      if (index < 0) throw new Error('The staged bearer is missing.')
+      state.bearers[index] = {...staged, ...note, pendingMint: undefined, updatedAt: Date.now()}
+    },
+    finalizePaymentReturn: async (staged, note) => {
+      const index = state.bearers.findIndex((bearer) => bearer.id === staged.id)
+      if (index < 0) throw new Error('The staged bearer is missing.')
+      const sourceId = state.bearers[index]?.pendingMint?.sourceBearerId
+      if (sourceId) {
+        const source = state.bearers.find((bearer) => bearer.id === sourceId)
+        if (source) source.spent = true
+      }
+      state.bearers[index] = {...state.bearers[index]!, ...note, pendingMint: undefined, updatedAt: Date.now()}
+    },
+    finalizeSpentMintOutput: (staged) => {
+      state.bearers = state.bearers.filter((bearer) => bearer.id !== staged.id)
+      return Promise.resolve()
+    },
+    commitCarve: async (carve) => {
+      // a checkpoint is identified by its output secret: the landed phase's
+      // URL carries a signature the staged phase's did not have yet
+      const sameOutput = (url: string, noteUrl: string): boolean =>
+        serverOf(url) === serverOf(noteUrl) &&
+        noteK1(url) !== null &&
+        noteK1(url) === noteK1(noteUrl)
+      const additions = [carve.note, ...(carve.change ? [carve.change] : [])].filter(
+        (note) => !state.bearers.some((bearer) => sameOutput(bearer.url, note.url)),
+      )
+      const changeset: NwcChangeset = {
+        add: additions,
+        markSpent: carve.consumed.map((bearer) => bearer.id),
+      }
+      await options.commitChangeset?.(changeset)
+      state.changesets.push(changeset)
+      for (const bearer of state.bearers) {
+        if (changeset.markSpent.includes(bearer.id)) bearer.spent = true
+      }
+      for (const note of additions) {
+        bearerCounter += 1
+        state.bearers.unshift({
+          ...note,
+          id: `carve-${bearerCounter}`,
+          createdAt: Date.now(),
+          updatedAt: Date.now(),
+        })
+      }
+      const committed = state.bearers.find((bearer) => sameOutput(bearer.url, carve.note.url))
+      if (!committed) throw new Error('The carved note was not committed.')
+      return committed
+    },
     applyChangeset: async (changeset: NwcChangeset) => {
       await options.commitChangeset?.(changeset)
       state.changesets.push(changeset)

src/lnurlcash/nwc/context.ts

@@ -10,6 +10,9 @@ import type {LnurlcashOptions} from 'lnurlcash-kit'
 import type {Bearer, NewBearer} from '../types'
 import type {NwcConnectionRecord} from '../storage/nwcConnections'
 import type {PreparedMint} from '../ops'
+import type {CarveResult} from '../ops'
+import type {OutputSecretAllocator} from '../ops/allocation'
+import type {MintSignatureKeys} from '../ops/shared'
 import type {PollOptions} from '../ops/shared'
 
 import type {NwcConnectionInfo} from './connection'
@@ -31,6 +34,38 @@ export type NwcServiceDeps = {
   // mint - NIP-47's make_invoice carries no mint choice)
   getDefaultMint: () => string | null
   assertCurrentOwner: () => void
+  // the wallet's durable allocation path (BIP-32 reservation) for every
+  // note output secret a request stages
+  allocateOutputSecrets: (
+    server: string,
+    count: number,
+    assertOwner: () => void,
+  ) => Promise<readonly string[]>
+  // trusted current+previous signing keys a landed carve output verifies
+  // against - the trusted-mint registry, owner-scoped
+  mintSignatureKeys: MintSignatureKeys
+  recoverPendingMints: (assertOwner: () => void) => Promise<void>
+  persistMintOutput: (note: NewBearer, assertOwner: () => void) => Promise<Bearer>
+  discardMintOutput: (staged: Bearer, assertOwner: () => void) => Promise<void>
+  setMintOutputRetirement: (
+    staged: Bearer,
+    retireAfter: number,
+    assertOwner: () => void,
+  ) => Promise<void>
+  reserveMintOutputSource: (
+    staged: Bearer,
+    sourceId: string,
+    recoverySecret: string,
+    assertOwner: () => void,
+  ) => Promise<void>
+  finalizeMintOutput: (staged: Bearer, note: NewBearer, assertOwner: () => void) => Promise<void>
+  finalizePaymentReturn: (
+    staged: Bearer,
+    note: NewBearer,
+    assertOwner: () => void,
+  ) => Promise<void>
+  finalizeSpentMintOutput: (staged: Bearer, assertOwner: () => void) => Promise<void>
+  commitCarve: (carve: CarveResult, assertOwner: () => void) => Promise<Bearer>
   applyChangeset: (
     changeset: NwcChangeset,
     connection: NwcConnectionInfo,
@@ -61,6 +96,7 @@ export type PendingInvoice = {
   createdAt: number // unix seconds
   expiresAt?: number
   prepared: PreparedMint
+  stagedOutput: Bearer
   state: 'pending' | 'settled' | 'failed'
   preimage?: string
   settledAt?: number

src/lnurlcash/nwc/dispatch.ts

@@ -12,11 +12,13 @@ import {prepareMint} from '../ops'
 import {PollAbortedError} from '../ops/shared'
 
 import type {PendingInvoice, RequestContext} from './context'
-import {invoiceResult, resolvePaymentHash, settleAndClaim} from './invoices'
+import {invoiceResult, invoiceRetireAfter, resolvePaymentHash, settleAndClaim} from './invoices'
 import {handlePayInvoice} from './pay'
 import type {NwcRequest, NwcResponse} from './protocol'
 import {NWC_METHODS, errResult, okResult} from './protocol'
 
+const MAX_PENDING_MINT_OUTPUTS = 20
+
 // the same eligibility carve applies - the balance answers "what could
 // this wallet actually pay with right now"
 const spendable = (bearer: Bearer): boolean =>
@@ -55,18 +57,86 @@ const handleMakeInvoice = async (
   if (!mint) {
     return errResult('make_invoice', 'INTERNAL', 'No default mint is configured.')
   }
+  const now = ctx.nowSeconds()
+  if (
+    ctx.deps
+      .getBearers()
+      .some(
+        (bearer) =>
+          !bearer.spent &&
+          bearer.pendingMint?.retireAfter !== undefined &&
+          bearer.pendingMint.retireAfter <= now,
+      )
+  ) {
+    await ctx.deps.recoverPendingMints(ctx.assertOwner)
+  }
+  const pendingOutputs = ctx.deps
+    .getBearers()
+    .filter((bearer) => bearer.pendingMint && !bearer.spent).length
+  if (pendingOutputs >= MAX_PENDING_MINT_OUTPUTS) {
+    return errResult('make_invoice', 'QUOTA_EXCEEDED', 'Too many unpaid invoices are pending.')
+  }
   let prepared: PreparedMint
+  let stagedOutput: Bearer | undefined
   try {
-    prepared = await prepareMint(mint, amountMsat, ctx.deps.kit ?? {})
+    prepared = await prepareMint(mint, amountMsat, {
+      ...(ctx.deps.kit ?? {}),
+      assertOwner: ctx.assertOwner,
+      allocateOutputSecrets: (server, count) =>
+        ctx.deps.allocateOutputSecrets(server, count, ctx.assertOwner),
+      persistOutput: async (note) => {
+        stagedOutput = await ctx.deps.persistMintOutput(note, ctx.assertOwner)
+      },
+    })
   } catch (err) {
+    if (stagedOutput) {
+      try {
+        await ctx.deps.discardMintOutput(stagedOutput, ctx.assertOwner)
+      } catch (cleanupError) {
+        return errResult(
+          'make_invoice',
+          'INTERNAL',
+          cleanupError instanceof Error ? cleanupError.message : String(cleanupError),
+        )
+      }
+    }
     return errResult('make_invoice', 'INTERNAL', err instanceof Error ? err.message : String(err))
   }
+  if (!stagedOutput) {
+    return errResult('make_invoice', 'INTERNAL', 'The pending mint output was not persisted.')
+  }
+  const retireAfter = invoiceRetireAfter(prepared.invoice)
+  if (retireAfter !== null) {
+    try {
+      await ctx.deps.setMintOutputRetirement(
+        stagedOutput,
+        retireAfter,
+        ctx.assertOwner,
+      )
+    } catch (error) {
+      try {
+        await ctx.deps.discardMintOutput(stagedOutput, ctx.assertOwner)
+      } catch (cleanupError) {
+        return errResult(
+          'make_invoice',
+          'INTERNAL',
+          cleanupError instanceof Error ? cleanupError.message : String(cleanupError),
+        )
+      }
+      return errResult(
+        'make_invoice',
+        'INTERNAL',
+        error instanceof Error ? error.message : String(error),
+      )
+    }
+  }
   const entry: PendingInvoice = {
     invoice: prepared.invoice,
     paymentHash: resolvePaymentHash(prepared),
     amountMsat: prepared.grossMsat,
     createdAt: ctx.nowSeconds(),
     prepared,
+    stagedOutput,
     state: 'pending',
   }
   if (typeof params.description === 'string' && params.description) {

src/lnurlcash/nwc/invoices.ts

@@ -1,26 +1,16 @@
 // The invoice registry the two-phase make_invoice / lookup_invoice pair
-// shares: make_invoice answers with the invoice immediately while this
+// shares. A minted note always lives at the wallet-chosen secret that was
-// module's settleAndClaim watches settlement in the background, claims
+// durably staged before quote creation; the payment preimage is only a
-// the minted note, and only THEN records the settlement the lookup
+// receipt. Settlement becomes visible only after the staged bearer has
-// reports.
+// been replaced with the confirmed note details.
-//
-// THE PREIMAGE, in lnurlcash terms: on an UNNAMED mint the payment
-// preimage IS the minted note's initial secret. NIP-47 clients expect it
-// as the settlement receipt, so it is handed out - but only after
-// claimFromPreimage has rotated the fresh note, when that secret is
-// burned and worthless. If the rotation failed (claimed.rotated ===
-// false) the preimage is withheld: fund safety over spec comfort. On a
-// NAMED mint the note lives at a wallet-chosen secret from the start and
-// the preimage opens nothing at all, so it is an ordinary payment receipt
-// and always safe to hand out.
 
 import {isPreimage, sameInvoice} from 'lnurlcash-kit'
 import {sha256} from '@noble/hashes/sha2.js'
 import {bytesToHex, utf8ToBytes} from '@noble/hashes/utils.js'
 
-import type {NewBearer} from '../types'
 import type {PreparedMint} from '../ops'
-import {claimFromPreimage, claimFromSecret} from '../ops/mint'
+import {MintedNoteSpentError} from '../ops'
+import {claimFromSecret} from '../ops/mint'
 import {pollVerifyUntilSettled} from '../ops/shared'
 import type {PollOptions} from '../ops/shared'
 
@@ -32,18 +22,56 @@ export const DEFAULT_CLAIM_POLL: Required<Omit<PollOptions, 'signal'>> = {
   maxWaitMs: 15 * 60_000,
 }
 
-// LUD-21 verify URLs end in /verify/<payment_hash> (the protocol's verify
+const BECH32_CHARSET = 'qpzry9x8gf2tvdw0s3jn54khce6mua7l'
-// convention) - that suffix is the invoice's real payment hash. A service
+const BOLT11_EXPIRY_TAG = BECH32_CHARSET.indexOf('x')
-// that shapes its verify URL differently gets a wallet-local correlation
+const BOLT11_DEFAULT_EXPIRY_SECONDS = 3600
-// id instead (sha256 of the invoice): still unique and stable for
+const SETTLEMENT_GRACE_SECONDS = 14 * 24 * 60 * 60
-// make_invoice <-> lookup_invoice correlation, just not the on-chain hash.
+
+// The kit has already validated the invoice before this parser runs. Read
+// only BOLT11's timestamp and optional expiry tag; an unfamiliar shape stays
+// durable forever rather than risking retirement while it could still settle.
+export const invoiceRetireAfter = (invoice: string): number | null => {
+  const normalized = invoice.toLowerCase()
+  const separator = normalized.lastIndexOf('1')
+  if (separator < 1 || normalized.length - separator <= 6) return null
+  const words = [...normalized.slice(separator + 1, -6)].map((character) =>
+    BECH32_CHARSET.indexOf(character),
+  )
+  if (words.length < 7 || words.some((word) => word < 0)) return null
+  const timestamp = words.slice(0, 7).reduce((value, word) => value * 32 + word, 0)
+  if (!Number.isSafeInteger(timestamp)) return null
+  let expiry = BOLT11_DEFAULT_EXPIRY_SECONDS
+  let offset = 7
+  // Conformance invoices omit the 65-byte signature; real BOLT11 invoices
+  // include its fixed 104 words after the tagged fields.
+  const taggedEnd = words.length >= 7 + 104 ? words.length - 104 : words.length
+  while (offset + 3 <= taggedEnd) {
+    const tag = words[offset]
+    const firstLength = words[offset + 1]
+    const secondLength = words[offset + 2]
+    if (tag === undefined || firstLength === undefined || secondLength === undefined) return null
+    const length = firstLength * 32 + secondLength
+    const valueStart = offset + 3
+    const valueEnd = valueStart + length
+    if (valueEnd > taggedEnd) return null
+    if (tag === BOLT11_EXPIRY_TAG) {
+      expiry = words.slice(valueStart, valueEnd).reduce((value, word) => value * 32 + word, 0)
+      if (!Number.isSafeInteger(expiry)) return null
+    }
+    offset = valueEnd
+  }
+  const retireAfter = timestamp + expiry + SETTLEMENT_GRACE_SECONDS
+  return Number.isSafeInteger(retireAfter) ? retireAfter : null
+}
+
+// LUD-21 verify URLs conventionally end in the payment hash. A service
+// that uses another shape gets a stable wallet-local correlation id.
 export const resolvePaymentHash = (prepared: PreparedMint): string => {
   const fromVerify = prepared.verifyUrl?.match(/\/([0-9a-f]{64})$/i)?.[1]
   if (fromVerify) return fromVerify.toLowerCase()
   return bytesToHex(sha256(utf8ToBytes(prepared.invoice)))
 }
 
-// the NIP-47 transaction object make_invoice and lookup_invoice share
 export const invoiceResult = (entry: PendingInvoice): Record<string, unknown> => {
   const result: Record<string, unknown> = {
     type: 'incoming',
@@ -56,89 +84,18 @@ export const invoiceResult = (entry: PendingInvoice): Record<string, unknown> =>
   }
   if (entry.description) result.description = entry.description
   if (entry.expiresAt) result.expires_at = entry.expiresAt
-  if (entry.state === 'settled' && entry.preimage) {
+  if (entry.state === 'settled' && entry.preimage) result.preimage = entry.preimage
-    result.preimage = entry.preimage
-  }
   if (entry.settledAt) result.settled_at = entry.settledAt
   return result
 }
 
-// the background half of make_invoice: watch the invoice, and once it
-// settles claim the note (rotating it immediately on an unnamed mint) and
-// hand the fresh bearer to the caller. Settlement is recorded LAST - after
-// the claim and bearer commit - so lookup can only reveal durably tracked
-// funds and, on an unnamed mint, an already-burned secret.
-// Throws on any failure; the caller marks the entry failed and reports
-// through deps.onError.
 export const settleAndClaim = async (ctx: RequestContext, entry: PendingInvoice): Promise<void> => {
-  if (entry.prepared.mode === 'named') return settleAndClaimNamed(ctx, entry)
-  if (!entry.prepared.verifyUrl) {
-    throw new Error(
-      'This mint did not advertise a verify URL - the invoice cannot be auto-claimed.',
-    )
-  }
-  // the observation half is interruptible (the client may never pay, so
-  // the poll can legally outlive the service); once settlement is seen,
-  // everything below - claim, rotate, bearer commit - is fund-critical and
-  // deliberately ignores the stop signal: stop's drain awaits it
-  const result = await pollVerifyUntilSettled(
-    entry.prepared.verifyUrl,
-    {...(ctx.deps.claimPoll ?? DEFAULT_CLAIM_POLL), signal: ctx.stopSignal},
-    ctx.deps.kit ?? {},
-  )
-  // a settled report only means this wallet's invoice was paid if it's
-  // for the invoice this wallet actually requested
-  if (!sameInvoice(result.pr, entry.prepared.invoice)) {
-    throw new Error("The service's verify response is for a different invoice than requested.")
-  }
-  const preimage = result.preimage
-  if (!preimage || !isPreimage(preimage)) {
-    throw new Error('The payment settled but the service did not reveal the preimage.')
-  }
-  // claimFromPreimage IS claimMintedNote's claim half (poll above is the
-  // other half) - invoked in two steps here because NWC needs the
-  // preimage, which claimMintedNote deliberately discards
-  const claimed = await claimFromPreimage(entry.prepared, preimage, {
-    ...(ctx.deps.kit ?? {}),
-    assertOwner: ctx.assertOwner,
-  })
-  const add: NewBearer[] = [claimed.note]
-  if (claimed.possibleCopy) add.push(claimed.possibleCopy)
-  await ctx.deps.applyChangeset(
-    {add, markSpent: []},
-    ctx.connection(),
-    'make_invoice',
-    ctx.assertOwner,
-  )
-  entry.settledAt = ctx.nowSeconds()
-  entry.state = 'settled'
-  if (claimed.rotated) {
-    // see the header: only a rotated note makes the preimage a worthless
-    // secret, safe to hand out as the settlement receipt
-    entry.preimage = preimage
-  }
-}
-
-// the named-mint half of settleAndClaim: the note lands at the wallet's
-// own secret, so its APPEARANCE there is the settlement observation and no
-// rotate follows. When the mint also serves the quote's verify, that
-// answer's preimage is kept as the NIP-47 receipt (an ordinary payment
-// proof on a named mint); a named mint without verify yields a settled
-// lookup with no preimage - correct, just receipt-less.
-const settleAndClaimNamed = async (
-  ctx: RequestContext,
-  entry: PendingInvoice,
-): Promise<void> => {
-  const noteSecret = entry.prepared.noteSecret
-  if (!noteSecret) {
-    throw new Error('This mint was prepared in named mode without a note secret.')
-  }
   const prepared = entry.prepared
   const claimPoll = ctx.deps.claimPoll ?? DEFAULT_CLAIM_POLL
   let preimage: string | null = null
   if (prepared.verifyUrl) {
-    // the interruptible observation half: watch settlement on verify,
+    // Observation remains interruptible. Once settlement is observed, the
-    // then claim by secret below (fund-critical, uninterruptible)
+    // claim and durable update ignore shutdown while stop drains the task.
     const result = await pollVerifyUntilSettled(
       prepared.verifyUrl,
       {...claimPoll, signal: ctx.stopSignal},
@@ -149,30 +106,23 @@ const settleAndClaimNamed = async (
     }
     if (result.preimage && isPreimage(result.preimage)) preimage = result.preimage
   }
-  // without a verify URL the claim poll IS the observation half, so it
+  let claimed
-  // stays interruptible; after a verify-observed settlement the note is
+  try {
-  // already there and this returns on the first check
+    claimed = await claimFromSecret(
-  const claimed = await claimFromSecret(
+      prepared,
-    {...prepared, noteSecret},
       prepared.verifyUrl ? claimPoll : {...claimPoll, signal: ctx.stopSignal},
       {
         ...(ctx.deps.kit ?? {}),
         assertOwner: ctx.assertOwner,
       },
     )
-  const add: NewBearer[] = [claimed.note]
+  } catch (error) {
-  if (claimed.possibleCopy) add.push(claimed.possibleCopy)
+    if (!(error instanceof MintedNoteSpentError)) throw error
-  await ctx.deps.applyChangeset(
+    await ctx.deps.finalizeSpentMintOutput(entry.stagedOutput, ctx.assertOwner)
-    {add, markSpent: []},
+    throw error
-    ctx.connection(),
+  }
-    'make_invoice',
+  await ctx.deps.finalizeMintOutput(entry.stagedOutput, claimed.note, ctx.assertOwner)
-    ctx.assertOwner,
-  )
   entry.settledAt = ctx.nowSeconds()
   entry.state = 'settled'
-  // the rotate guard still matters here: the rescue path (a mint that
+  if (preimage) entry.preimage = preimage
-  // took the hash but credited the PREIMAGE) claims through
-  // claimFromPreimage, and if its rotate failed the preimage is still a
-  // LIVE note secret - withheld exactly like the unnamed path
-  if (preimage && claimed.rotated) entry.preimage = preimage
 }

src/lnurlcash/nwc/pay.ts

@@ -10,6 +10,7 @@ import {
   fetchInvoiceVerification,
   isBolt11Invoice,
   noteK1,
+  withNewK1,
 } from 'lnurlcash-kit'
 
 import type {Bearer, NewBearer} from '../types'
@@ -33,19 +34,29 @@ import {errResult, okResult} from './protocol'
 export const payChangeset = (bearers: Bearer[], result: PayResult): NwcChangeset => {
   const add: NewBearer[] = []
   const markSpent: string[] = result.carve.consumed.map((b) => b.id)
-  if (result.carve.change) add.push(result.carve.change)
+  // the staged change's URL may lack the signature the landed result's URL
+  // carries - identify outputs by their secret, not the whole URL
+  const changeK1 = result.carve.change ? noteK1(result.carve.change.url) : null
+  if (
+    result.carve.change &&
+    !bearers.some((bearer) => changeK1 !== null && noteK1(bearer.url) === changeK1)
+  ) {
+    add.push(result.carve.change)
+  }
+  const carvedK1 = noteK1(result.carve.note.url)
+  const existing = carvedK1 ? bearers.find((bearer) => noteK1(bearer.url) === carvedK1) : undefined
   if (result.outcome === 'failed-funds-returned') {
-    add.push(result.rotatedNote ?? result.carve.note)
+    if (existing) {
+      const index = markSpent.indexOf(existing.id)
+      if (index >= 0) markSpent.splice(index, 1)
+    }
   } else {
     // settled / still-pending / already-spent: the carved note is gone or
     // locked. When it was one of the wallet's own bearers (an exact-match
     // carve), lock that bearer; a freshly carved note is never added -
     // it was born spent
-    const carvedK1 = noteK1(result.carve.note.url)
-    const existing = carvedK1 ? bearers.find((b) => noteK1(b.url) === carvedK1) : undefined
     if (existing) markSpent.push(existing.id)
   }
-  if (result.rescuedNote) add.push(result.rescuedNote)
   return {add, markSpent}
 }
 
@@ -79,11 +90,40 @@ export const handlePayInvoice = async (
   }
   const bearers = ctx.deps.getBearers()
   let result: PayResult
+  let committedCarve: Bearer | undefined
+  let returnStage: Bearer | undefined
   try {
     result = await payWithBearers(bearers, invoice, {
       poll: ctx.deps.poll ?? {},
       kit: ctx.deps.kit ?? {},
       assertOwner: ctx.assertOwner,
+      allocateOutputSecrets: (server, count) =>
+        ctx.deps.allocateOutputSecrets(server, count, ctx.assertOwner),
+      mintSignatureKeys: ctx.deps.mintSignatureKeys,
+      onCarve: async (carve) => {
+        committedCarve = await ctx.deps.commitCarve(carve, ctx.assertOwner)
+      },
+      onReturnReady: async (carve, recoverySecret) => {
+        const source =
+          committedCarve ?? ctx.deps.getBearers().find((bearer) => bearer.url === carve.note.url)
+        if (!source) throw new Error('The carved note was not tracked.')
+        returnStage = await ctx.deps.persistMintOutput(
+          {
+            url: withNewK1(carve.note.url, recoverySecret, carve.note.amount),
+            callback: '',
+            amount: 0,
+            verified: false,
+            pendingMint: {retireAfter: ctx.nowSeconds() + 14 * 24 * 60 * 60},
+          },
+          ctx.assertOwner,
+        )
+        await ctx.deps.reserveMintOutputSource(
+          returnStage,
+          source.id,
+          recoverySecret,
+          ctx.assertOwner,
+        )
+      },
     })
   } catch (err) {
     if (err instanceof UncertainOutcomeError) {
@@ -109,6 +149,14 @@ export const handlePayInvoice = async (
       message,
     )
   }
+  if (returnStage) {
+    const returned = result.rotatedNote ?? result.rescuedNote
+    if (returned) {
+      await ctx.deps.finalizePaymentReturn(returnStage, returned, ctx.assertOwner)
+    } else if (result.outcome !== 'unknown-still-pending') {
+      await ctx.deps.finalizeSpentMintOutput(returnStage, ctx.assertOwner)
+    }
+  }
   const spendRecorded = (): void => {
     // This conservative budget debit is persisted separately from bearer
     // storage. A later bearer commit failure does not roll it back.
@@ -119,7 +167,7 @@ export const handlePayInvoice = async (
     case 'settled': {
       spendRecorded()
       await ctx.deps.applyChangeset(
-        payChangeset(bearers, result),
+        payChangeset(ctx.deps.getBearers(), result),
         ctx.connection(),
         'pay_invoice',
         ctx.assertOwner,
@@ -142,7 +190,7 @@ export const handlePayInvoice = async (
     }
     case 'failed-funds-returned':
       await ctx.deps.applyChangeset(
-        payChangeset(bearers, result),
+        payChangeset(ctx.deps.getBearers(), result),
         ctx.connection(),
         'pay_invoice',
         ctx.assertOwner,
@@ -154,7 +202,7 @@ export const handlePayInvoice = async (
       )
     case 'note-already-spent':
       await ctx.deps.applyChangeset(
-        payChangeset(bearers, result),
+        payChangeset(ctx.deps.getBearers(), result),
         ctx.connection(),
         'pay_invoice',
         ctx.assertOwner,
@@ -167,7 +215,7 @@ export const handlePayInvoice = async (
     case 'unknown-still-pending':
       spendRecorded()
       await ctx.deps.applyChangeset(
-        payChangeset(bearers, result),
+        payChangeset(ctx.deps.getBearers(), result),
         ctx.connection(),
         'pay_invoice',
         ctx.assertOwner,

src/lnurlcash/nwc/service.ts

@@ -89,13 +89,24 @@ export const startService = async (
     )
   }
 
-  // pay_invoice goes through the connection's queue (budget atomicity);
+  let invoiceQueue: Promise<unknown> = Promise.resolve()
-  // everything else dispatches directly
+
+  // Payments serialize per connection for budget atomicity. Invoice
+  // creation serializes across the service so different clients cannot
+  // race the wallet-wide durable pending-output cap.
   const dispatchSerialized = (
     runtime: ConnectionRuntime,
     ctx: RequestContext,
     request: NwcRequest,
   ): Promise<NwcResponse> => {
+    if (request.method === 'make_invoice') {
+      const run = invoiceQueue.then(
+        () => dispatch(ctx, request),
+        () => dispatch(ctx, request),
+      )
+      invoiceQueue = run.catch(() => undefined)
+      return run
+    }
     if (request.method !== 'pay_invoice') return dispatch(ctx, request)
     const run = runtime.queue.then(
       () => dispatch(ctx, request),
@@ -223,8 +234,12 @@ export const startService = async (
     accepting = false
     for (const runtime of runtimes) runtime.sub.close()
     stopController.abort()
-    stopPromise = Promise.all([...inFlight])
+    stopPromise = Promise.allSettled([...inFlight])
-      .then(() => undefined)
+      .then((results) => {
+        for (const result of results) {
+          if (result.status === 'rejected') throw result.reason
+        }
+      })
       .finally(() => {
         for (const runtime of runtimes) {
           runtime.walletSecret?.fill(0)

src/stores/nwc.atomic.test.ts

@@ -4,6 +4,7 @@ import { beforeEach, describe, expect, it, vi } from 'vitest';
 
 import type { NwcService, NwcServiceDeps } from '@/lnurlcash/nwc';
 import type * as NwcExports from '@/lnurlcash/nwc';
+import { FUNDS_STORAGE_KEY } from '@/lnurlcash/storage/bearers';
 import { stubLocalStorage } from '@/lnurlcash/test-utils';
 import type { NewBearer } from '@/lnurlcash/types';
 import { useActivityStore } from './activity';
@@ -29,7 +30,11 @@ const note = (secret: string): NewBearer => ({
 beforeEach(() => {
   vi.clearAllMocks();
   vi.unstubAllGlobals();
-  vi.stubGlobal('navigator', {});
+  // a present-but-non-serializing LockManager fake: walletFunds serializes
+  // its own mutations, so single-store tests only need locks to EXIST
+  vi.stubGlobal('navigator', {
+    locks: { request: (_name: string, fn: () => unknown) => Promise.resolve().then(fn) },
+  });
   stubLocalStorage();
   setActivePinia(createPinia());
   mocks.startService.mockResolvedValue({
@@ -69,7 +74,7 @@ describe('NWC store changeset adapter', () => {
       start[1].assertCurrentOwner,
     );
 
-    expect(writes.mock.calls.filter(([key]) => key === 'sattle_bearers')).toHaveLength(1);
+    expect(writes.mock.calls.filter(([key]) => key === FUNDS_STORAGE_KEY)).toHaveLength(1);
     expect(wallet.bearers).toHaveLength(2);
     expect(wallet.bearers.find(({ id }) => id === existing.id)?.spent).toBe(true);
   });

src/stores/nwc.lifecycle.test.ts

@@ -16,16 +16,58 @@ import {
 import { setNwcTransportForTests, useNwcStore } from './nwc';
 import { useWalletStore } from './wallet';
 
+// a present-but-non-serializing LockManager fake: walletFunds serializes its
+// own mutations, so single-store tests only need locks to EXIST
+const stubPassthroughLocks = (): void => {
+  vi.stubGlobal('navigator', {
+    locks: { request: (_name: string, fn: () => unknown) => Promise.resolve().then(fn) },
+  });
+};
+
 beforeEach(() => {
   vi.restoreAllMocks();
   vi.unstubAllGlobals();
-  vi.stubGlobal('navigator', {});
+  stubPassthroughLocks();
   stubLocalStorage();
   setActivePinia(createPinia());
   setNwcTransportForTests(null);
 });
 
 describe('NWC wallet lifecycle drain', () => {
+  it('keeps one service when enabling twice', async () => {
+    const wallet = useWalletStore();
+    await wallet.create();
+    const relay = createFakeRelay();
+    setNwcTransportForTests(relay.transport);
+    const nwc = useNwcStore();
+    nwc.create(RELAYS, { maxMsat: 50_000, periodMs: 86_400_000 });
+
+    await nwc.setEnabled(true);
+    await nwc.setEnabled(true);
+
+    expect(relay.subscriptionCount()).toBe(1);
+    await nwc.stop();
+    expect(relay.subscriptionCount()).toBe(0);
+  });
+
+  it('drains an accepted foreground fund operation before lock clears its fence', async () => {
+    const wallet = useWalletStore();
+    await wallet.create('password');
+    const operation = wallet.beginFundOperation();
+    let lockSettled = false;
+
+    const locking = wallet.lock().then(() => {
+      lockSettled = true;
+    });
+    await vi.waitFor(() => expect(() => wallet.captureOwnerFence()).toThrow());
+    expect(lockSettled).toBe(false);
+    operation.ownerFence();
+
+    operation.complete();
+    await locking;
+    expect(wallet.state).toBe('locked');
+  });
+
   it('commits an accepted melted payment before ordinary lock invalidates its owner fence', async () => {
     // Given a real encrypted wallet and NWC service whose payment is held
     // after the mint burned its note but before the wallet commits the delta

src/stores/nwc.ts

@@ -1,3 +1,4 @@
+// allow: SIZE_OK — indivisible NWC service lifecycle state machine and Pinia control surface.
 import { ref, watch } from 'vue';
 import { defineStore } from 'pinia';
 
@@ -21,6 +22,7 @@ import {
   writeNwcEnabled,
 } from '@/lnurlcash/nwc';
 import { linkingPubKeyHex } from '@/lnurlcash/keys';
+import { getTrustedMintVerificationKeys } from '@/lnurlcash/trustedMints';
 import { msatToSats } from '@/lnurlcash/units';
 import { TrustedMintPostCommitError, useWalletStore } from './wallet';
 import { useMintsStore } from './mints';
@@ -142,11 +144,77 @@ export const useNwcStore = defineStore('nwc', () => {
     lastError.value = '';
     try {
       const ownerFence = wallet.captureOwnerFence();
+      if (wallet.bearers.some((bearer) => bearer.pendingMint && !bearer.spent)) {
+        await wallet.recoverPendingMints(ownerFence);
+        if (token !== startToken || wallet.state !== 'unlocked' || !enabled.value) return;
+      }
       const started = await startService(wallet.requireLinkingKey(), {
         // only spendable notes may back an NWC payment
         getBearers: () => wallet.unspentBearers,
         getDefaultMint: () => mints.defaultMint,
         assertCurrentOwner: ownerFence,
+        allocateOutputSecrets: (server, count, assertOwner) =>
+          wallet.allocateOutputSecrets(server, count, assertOwner),
+        // a mid-request lockdown must not verify anything new: no keys
+        mintSignatureKeys: (server) =>
+          wallet.state === 'unlocked' && wallet.pubkey !== null
+            ? getTrustedMintVerificationKeys(server, wallet.pubkey)
+            : [],
+        recoverPendingMints: (assertOwner) => wallet.recoverPendingMints(assertOwner),
+        persistMintOutput: async (note, assertOwner) => {
+          const [persisted] = await wallet.addBearers([note], assertOwner);
+          if (!persisted) throw new Error('The pending mint output was not persisted.');
+          return persisted;
+        },
+        discardMintOutput: async (staged, assertOwner) => {
+          await wallet.removeNote(staged.id, assertOwner);
+        },
+        setMintOutputRetirement: async (staged, retireAfter, assertOwner) =>
+          wallet.updateBearer(
+            staged.id,
+            { pendingMint: { ...staged.pendingMint, retireAfter } },
+            assertOwner,
+          ),
+        reserveMintOutputSource: async (staged, sourceId, recoverySecret, assertOwner) => {
+          await wallet.reserveStagedMintSource(staged.id, sourceId, recoverySecret, assertOwner);
+        },
+        finalizeMintOutput: async (staged, note, assertOwner) => {
+          try {
+            await wallet.finalizeStagedMintOutput(staged.id, note, assertOwner);
+          } catch (error) {
+            if (!(error instanceof TrustedMintPostCommitError)) throw error;
+            lastError.value = error.message;
+          }
+          await activity.log(
+            'nwc',
+            `Received ${formatSats(note.amount)} sats via NWC.`,
+            (error) => {
+              lastError.value = error.message;
+            },
+          );
+        },
+        finalizePaymentReturn: async (staged, note, assertOwner) => {
+          try {
+            await wallet.finalizeStagedMintOutput(staged.id, note, assertOwner);
+          } catch (error) {
+            if (!(error instanceof TrustedMintPostCommitError)) throw error;
+            lastError.value = error.message;
+          }
+        },
+        finalizeSpentMintOutput: async (staged, assertOwner) => {
+          await wallet.finalizeSpentStagedMintOutput(staged.id, assertOwner);
+        },
+        commitCarve: async (carve, assertOwner) => {
+          try {
+            return await wallet.commitCarve(carve, assertOwner);
+          } catch (error) {
+            if (!(error instanceof TrustedMintPostCommitError)) throw error;
+            lastError.value = error.message;
+            const committed = wallet.bearers.find((bearer) => bearer.url === carve.note.url);
+            if (!committed) throw error;
+            return committed;
+          }
+        },
         applyChangeset,
         transport: transportOverride ?? undefined,
         onError: (error) => {
@@ -193,7 +261,13 @@ export const useNwcStore = defineStore('nwc', () => {
     running.value = false;
     const priorStop = stopping;
     const activeStop = active?.stop() ?? Promise.resolve();
-    const completion = Promise.all([priorStop, activeStop, ...pendingStarts]).then(() => undefined);
+    const completion = Promise.allSettled([priorStop, activeStop, ...pendingStarts]).then(
+      (results) => {
+        for (const result of results) {
+          if (result.status === 'rejected') throw result.reason;
+        }
+      },
+    );
     pendingStop = completion;
     stopping = completion.catch(() => undefined);
     return completion;
@@ -232,6 +306,10 @@ export const useNwcStore = defineStore('nwc', () => {
 
   // ---- settings ----
   const setEnabled = async (value: boolean): Promise<void> => {
+    if (value === enabled.value) {
+      if (value && !running.value && pendingStarts.size === 0) await start();
+      return;
+    }
     const ownerId = ownerFromWallet();
     writeNwcEnabled(ownerId, value);
     enabled.value = value;

src/stores/wallet.ts

@@ -67,6 +67,7 @@ export const useWalletStore = defineStore('wallet', () => {
   let currentMaterial: WalletMaterialV2 | null = null;
   let lifecycleToken = 0;
   let acceptingOwnerWork = false;
+  const foregroundFundOperations = new Set<Promise<void>>();
 
   const lockWarningSecondsLeft = ref<number | null>(null);
   const runTransition = createWalletTransitionQueue({
@@ -105,12 +106,22 @@ export const useWalletStore = defineStore('wallet', () => {
     pubkey.value = null;
   };
 
+  const drainAcceptedOwnerWork = async (): Promise<void> => {
+    const results = await Promise.allSettled([
+      stopWalletNwcSession(),
+      ...foregroundFundOperations,
+    ]);
+    for (const result of results) {
+      if (result.status === 'rejected') throw result.reason;
+    }
+  };
+
   const deactivateSession = async (): Promise<void> => {
     acceptingOwnerWork = false;
     stopOwnerChanges();
     idleWatch.stop();
     try {
-      await stopWalletNwcSession();
+      await drainAcceptedOwnerWork();
     } finally {
       // even a rejected drain ends the session: 'locked' never holds key
       // material and no captured fence stays valid
@@ -201,7 +212,7 @@ export const useWalletStore = defineStore('wallet', () => {
       // the drain runs before the fence is invalidated and the runtime is
       // cleared so an in-flight fund-critical changeset can still commit
       // (its applyChangeset needs the live fence and key)
-      await stopWalletNwcSession();
+      await drainAcceptedOwnerWork();
       invalidateLifecycle();
       clearRuntime();
       if (ownerId === null) await clearUnownedAuthorizations();
@@ -323,6 +334,28 @@ export const useWalletStore = defineStore('wallet', () => {
     return currentMaterial;
   };
 
+  const beginFundOperation = (): {
+    readonly ownerFence: () => void;
+    readonly complete: () => void;
+  } => {
+    const captured = ownerFence.capture();
+    let completePromise: (() => void) | undefined;
+    const completion = new Promise<void>((resolve) => {
+      completePromise = resolve;
+    });
+    foregroundFundOperations.add(completion);
+    let active = true;
+    return {
+      ownerFence: captured,
+      complete: () => {
+        if (!active) return;
+        active = false;
+        foregroundFundOperations.delete(completion);
+        completePromise?.();
+      },
+    };
+  };
+
   const funds = createWalletFunds({
     requireKey,
     requireCashRoot: () => cashNodeFromHex(requireWalletMaterial().cashRootHex),
@@ -355,5 +388,6 @@ export const useWalletStore = defineStore('wallet', () => {
     requireLinkingKey,
     requireWalletMaterial,
     captureOwnerFence: ownerFence.capture,
+    beginFundOperation,
   };
 });