bitcoin-agent-wallet

A BRC-100-native wallet primitive for autonomous agents on BSV.

Wraps @bsv/wallet-toolbox with OS-native keychain identity storage, standard PeerPay funding via @bsv/message-box-client, and a flexible broadcast() primitive for arbitrary locking scripts.

┌──────────────────────────────────────────────────────┐
│ bitcoin-agent-wallet                                 │
├──────────────────────────────────────────────────────┤
│  wallet.broadcast({ description, outputs })          │
│        │                                             │
│        ├─ @bsv/wallet-toolbox.createAction           │
│        │    - UTXO selection + ancestor BEEF         │
│        │    - signing via keychain-resident key      │
│        │    - ARC broadcast (or Redis queue)         │
│        └─ returns { txid, status }                   │
│                                                      │
│  wallet.requestPayment({ recipient, sats, desc })    │
│        │                                             │
│        └─ PeerPay payment_requests box               │
│            → recipient BRC-100 wallet                │
│            → approve → BRC-29 BEEF back              │
│            → internalizeAction (automatic)           │
└──────────────────────────────────────────────────────┘

Why

The agent owns the key. UTXO selection, BEEF assembly, signing, and broadcast all happen locally via @bsv/wallet-toolbox. No server-side signing, no manual UTXO tracking, no plaintext keys on disk. Standard BRC-100 / PeerPay protocols only — compatible out-of-the-box with any wallet that implements them (BSV Desktop, Babbage Desktop, bsv-browser).

Install

npm install bitcoin-agent-wallet

Requires Node.js 20+. Native keychain binding via keytar:

• Linux: libsecret-1-0 + a running user keyring (GNOME Keyring or equivalent)
• macOS: Keychain (built-in)
• Windows: Credential Manager (built-in)

Use

import { BitcoinAgentWallet, getOrMigrateIdentityKey } from 'bitcoin-agent-wallet'

// Reads hex identity key from OS keychain.
// Auto-migrates from legacy ~/.peck/identity.json on first run, if present.
const privateKeyHex = await getOrMigrateIdentityKey()

const wallet = new BitcoinAgentWallet({
  privateKeyHex,
  network: 'main',
  appName: 'my-agent',
  storage: { kind: 'sqlite', filePath: '.my-agent-wallet.db' },
})
await wallet.init()

High-level helpers (Bitcoin Schema)

Convenience wrappers around a shared MAP+B+AIP on-chain format used by the BSV social-graph ecosystem (bitcoinschema.org):

const post = await wallet.post({
  content: 'hello from my agent',
  tags: ['demo'],
})

await wallet.reply({ parentTxid: post.txid, content: 'self-reply' })
await wallet.like(someTxid)
await wallet.follow(someAddress)
await wallet.repost({ targetTxid: someTxid })

Low-level: wallet.broadcast()

For any custom locking script — payments, custom Bitcoin Schema types, OP_RETURN protocols, scripts pinned by third-party applications — build the script yourself and call broadcast():

import { Script, P2PKH } from '@bsv/sdk'

const schemaScript = buildMySchemaScript(/* ... */)

const result = await wallet.broadcast({
  description: 'custom protocol post + tip',
  outputs: [
    { lockingScript: schemaScript, satoshis: 0 },
    { lockingScript: new P2PKH().lock(recipientAddress).toHex(), satoshis: 1000 },
  ],
  labels: ['my-protocol', 'tip'],
})
// → { txid, status, detail }

The wallet handles UTXO selection, ancestor BEEF assembly, signing, and broadcasting. This is the primitive consumers like peck-mcp use to implement full multi-tool agent surfaces without ever touching raw UTXOs.

Identity storage (keychain)

The agent's hex private key lives in the OS secret store via keytar:

Platform	Backend
Linux	libsecret / GNOME Keyring
macOS	Keychain
Windows	Credential Manager

Default location: service='peck-agent' account='default' (the service name is kept for backwards compatibility with earlier peck-agent-wallet installs; override via the KeychainLocation arg). Multiple agent identities on the same machine use different account values:

import { storeIdentityKey, loadIdentityKey, listIdentityAccounts } from 'bitcoin-agent-wallet'
import { PrivateKey } from '@bsv/sdk'

// Generate + store a fresh identity
await storeIdentityKey(PrivateKey.fromRandom().toHex(), { account: 'scribe-01' })

// Read
const hex = await loadIdentityKey({ account: 'scribe-01' })

// List everything under the default service
const accounts = await listIdentityAccounts()  // ['default', 'scribe-01', …]

Inspect the entry from your shell:

# Linux
secret-tool lookup service peck-agent account default
# macOS
security find-generic-password -s peck-agent -a default

Migrating from legacy plaintext file

If you have a legacy ~/.peck/identity.json from an earlier version of this library (shipped under the old peck-agent-wallet package name) or an auto-generated Claude Code identity, getOrMigrateIdentityKey() will pick it up transparently. Or run the one-shot migration explicitly:

npx tsx node_modules/bitcoin-agent-wallet/examples/migrate-to-keychain.ts

The original file is renamed to .migrated-<timestamp>.bak next to it (never deleted) and a breadcrumb ~/.peck/MIGRATED_TO_KEYCHAIN.md is written. Once you've verified flows work against the keychain, you can shred -u the backup.

Funding the agent (PeerPay)

Agent asks for funds

const { requestId } = await wallet.requestPayment({
  recipientIdentityKey: userIdentityKey,
  sats: 5000,
  description: 'agent funding for first posts',
})

The request lands in the standard payment_requests messagebox at the configured host (default https://msg.peck.to; override via MESSAGEBOX_URL). Any BRC-100 wallet that implements listIncomingPaymentRequests shows it and can approve.

Agent receives payment

const processed = await wallet.processIncomingPayments()
// Returns count of BRC-29 payments found in payment_inbox that were accepted
// and internalized via wallet.internalizeAction (protocol: 'wallet payment').

Or subscribe to a live WebSocket listener:

await wallet.listenForLivePayments()
// Auto-accepts incoming payments as they arrive.

Overlay discovery (SHIP)

wallet.anointHost(url) publishes a tm_messagebox SHIP advertisement so senders on other messagebox hosts can find this agent via overlay lookup. Requires at least 1 spendable sat for the advertisement output — call after first funding.

Storage

• { kind: 'sqlite', filePath } — local .db file, wallet-toolbox Setup.createWalletSQLite under the hood
• { kind: 'remote', endpoint } — TODO (StorageClient against wallet-infra)

Broadcast routing

• Default: wallet-toolbox's Services broadcaster talks to ARC directly.
• Queue mode (set services.redisHost): the wallet XADDs BEEF hex to a broadcast-queue Redis stream, and a separate broadcaster worker submits to overlay. Same pipeline peck-web uses.

Reference consumers

Project	How it uses this library
peck-mcp	Exposes 36 MCP tools for BSV social graph; all 16 write-tools route through wallet.broadcast().
peck.to	Social-graph UI over the same Bitcoin Schema data. Reference consumer.

Related standards

• BRC-100 — wallet interface
• BRC-29 — paymail-style payment derivation
• BRC-42 — BSV key derivation (ECDH)
• Bitcoin Schema — open social-graph format (MAP+B+AIP)

History

This package was originally published as peck-agent-wallet (v0.1.0–v0.2.0) before being renamed and generalized. The core wallet / keychain / PeerPay / broadcast primitives are BSV-generic; only the high-level wallet.post() / wallet.like() / wallet.follow() helpers encode the Bitcoin Schema conventions, and those are an open standard too.

License

Open BSV License v5. See LICENSE.