Passkey Kit

[!TIP]
Looking for the latest smart wallet SDK?

This package is the legacy precursor to OpenZeppelin Smart Accounts. For new projects, use smart-account-kit — a comprehensive SDK built on top of the audited OpenZeppelin stellar-contracts library.

Smart Account Kit includes:

• Context rules with fine-grained authorization scopes
• Policy support (threshold multisig, spending limits, custom policies)
• Session management with automatic credential persistence
• External wallet adapter support
• Built-in indexer for contract discovery

See the OpenZeppelin Smart Account package and multisig example for more details.

[!WARNING]
Code in this repo is demo material only. It has not been audited. Do not use to hold, protect, or secure anything.

A TypeScript SDK for creating and managing Stellar smart wallets using passkeys. Works with OpenZeppelin Relayer for submitting passkey-signed transactions onchain.

Demo: passkey-kit-demo.pages.dev

Installation

bashCopy
pnpm i passkey-kit

Exports

tsCopy
import {
    PasskeyKit,      // Client-side wallet management
    PasskeyServer,   // Server-side utilities
    SACClient,       // Stellar Asset Contract helper
    PasskeyClient,   // Low-level contract client (from passkey-kit-sdk)
    SignerKey,       // Signer key type constructor
    SignerStore,     // Storage type enum
    type Signer,     // Signer type
    type SignerLimits // Signer limits type
} from 'passkey-kit'

---

PasskeyKit (Client)

Handles wallet creation, connection, and transaction signing.

Constructor

tsCopy
const account = new PasskeyKit({
    rpcUrl: string,              // Stellar RPC URL
    networkPassphrase: string,   // Network passphrase
    walletWasmHash: string,      // Smart wallet WASM hash
    timeoutInSeconds?: number,   // Transaction timeout (default: 30)
    WebAuthn?: {                 // Optional WebAuthn override
        startRegistration,
        startAuthentication
    }
})

Properties

Property	Type	Description
keyId	string | undefined	Current passkey ID (base64url)
wallet	PasskeyClient | undefined	Connected wallet client
networkPassphrase	string	Network passphrase

Methods

createWallet(app, user, settings?)

Creates a new passkey and deploys a smart wallet.

tsCopy
const { rawResponse, keyId, keyIdBase64, contractId, signedTx } = await account.createWallet(
    'My App',           // App name shown in passkey prompt
    'user@example.com', // User identifier
    {
        rpId?: string,  // Relying party ID
        authenticatorSelection?: AuthenticatorSelectionCriteria
    }
)

createKey(app, user, settings?)

Creates a new passkey without deploying a wallet.

tsCopy
const { rawResponse, keyId, keyIdBase64, publicKey } = await account.createKey(
    'My App',
    'user@example.com',
    { rpId?: string, authenticatorSelection?: AuthenticatorSelectionCriteria }
)

connectWallet(opts?)

Connects to an existing wallet using a passkey.

tsCopy
const { rawResponse, keyId, keyIdBase64, contractId } = await account.connectWallet({
    rpId?: string,
    keyId?: string | Uint8Array,           // Skip passkey prompt if provided
    getContractId?: (keyId: string) => Promise<string | undefined>,  // Lookup function
    walletPublicKey?: string               // For backwards compatibility
})

sign(txn, options?)

Signs all auth entries for the connected wallet in a transaction.

tsCopy
const signedTxn = await account.sign(
    txn,  // AssembledTransaction | Tx | string (XDR)
    {
        rpId?: string,
        keyId?: 'any' | string | Uint8Array,  // 'any' allows any passkey
        keypair?: Keypair,                     // Sign with Ed25519 instead
        policy?: string,                       // Sign with policy instead
        expiration?: number                    // Ledger expiration
    }
)

signAuthEntry(entry, options?)

Signs a single authorization entry. Same options as sign().

tsCopy
const signedEntry = await account.signAuthEntry(entry, options)

Signer Management

Add, update, or remove signers from the wallet.

tsCopy
// Add signers
await account.addSecp256r1(keyId, publicKey, limits, store, expiration?)
await account.addEd25519(publicKey, limits, store, expiration?)
await account.addPolicy(policy, limits, store, expiration?)

// Update signers
await account.updateSecp256r1(keyId, publicKey, limits, store, expiration?)
await account.updateEd25519(publicKey, limits, store, expiration?)
await account.updatePolicy(policy, limits, store, expiration?)

// Remove signer
await account.remove(signerKey)

Parameters:

• keyId - Passkey ID (string or Uint8Array)
• publicKey - Public key (string or Uint8Array for Secp256r1, Stellar public key for Ed25519)
• policy - Policy contract address
• limits - SignerLimits (see Types below)
• store - SignerStore.Persistent or SignerStore.Temporary
• expiration - Optional ledger expiration

---

PasskeyServer (Server)

Server-side utilities for Mercury indexing and OpenZeppelin Relayer.

Constructor

tsCopy
const server = new PasskeyServer({
    rpcUrl?: string,
    relayerUrl?: string,         // OpenZeppelin Relayer URL
    relayerApiKey?: string,      // Relayer API key
    mercuryProjectName?: string, // Mercury project name
    mercuryUrl?: string,         // Mercury URL
    mercuryJwt?: string,         // Mercury JWT (use either JWT or Key)
    mercuryKey?: string          // Mercury API key
})

Methods

getSigners(contractId)

Get all signers for a wallet from Mercury.

tsCopy
const signers: Signer[] = await server.getSigners('C...')

getContractId(options, index?)

Reverse lookup a wallet address from a signer.

tsCopy
const contractId = await server.getContractId({
    keyId?: string,     // Passkey ID (Secp256r1)
    publicKey?: string, // Ed25519 public key
    policy?: string     // Policy address
}, index)  // If multiple wallets, select by index (default: 0)

send(txn)

Submit a transaction via OpenZeppelin Relayer.

tsCopy
const result = await server.send(txn)  // AssembledTransaction | Tx | string

---

SACClient

Helper for interacting with Stellar Asset Contracts.

tsCopy
const sac = new SACClient({
    networkPassphrase: string,
    rpcUrl: string
})

const tokenClient = sac.getSACClient('C...')  // SAC contract ID

---

Types

SignerKey

tsCopy
SignerKey.Policy(contractAddress)    // Policy signer
SignerKey.Ed25519(publicKey)         // Ed25519 signer
SignerKey.Secp256r1(keyId)           // Passkey signer

SignerLimits

tsCopy
type SignerLimits = Map<string, SignerKey[] | undefined> | undefined

// Example: Limit signer to specific contract, requires co-signer
const limits = new Map([
    ['C...contractAddress', [SignerKey.Ed25519('G...')]]
])

SignerStore

tsCopy
enum SignerStore {
    Persistent = 'Persistent',  // Permanent storage
    Temporary = 'Temporary'     // Expires, cheaper
}

Signer

tsCopy
type Signer = {
    kind: string       // 'Secp256r1' | 'Ed25519' | 'Policy'
    key: string        // Signer identifier
    val: string        // Public key or empty
    expiration: number | null
    storage: 'Persistent' | 'Temporary'
    limits: string     // JSON stringified limits
    evicted?: boolean  // True if temporary signer was evicted
}

---

Deploy the Mercury Indexer

To track signers and reverse lookup wallet addresses, deploy the Zephyr program:

bashCopy
cd ./zephyr
cargo install mercury-cli
# Get a JWT from https://test.mercurydata.app
export MERCURY_JWT="<YOUR.MERCURY.JWT>"
# Requires Rust 1.79.0+
mercury-cli --jwt $MERCURY_JWT --local false --mainnet false deploy

---

TypeScript Configuration

This library exports TypeScript only to avoid bundling @stellar/stellar-sdk twice. Configure your bundler to transpile it.

Next.js (next.config.mjs):

mjsCopy
/** @type {import('next').NextConfig} */
const nextConfig = {
    transpilePackages: [
        'passkey-kit',
        'passkey-factory-sdk',
        'passkey-kit-sdk',
        'sac-sdk',
    ]
}

export default nextConfig

---

Contributing

bashCopy
# Install dependencies
pnpm i

# Build
pnpm run build

# Run demo
cd ./demo && pnpm i && pnpm run start

Directory structure:

• ./src - TypeScript SDK source
• ./demo - Demo application
• ./contracts - Rust Soroban smart contracts
• ./zephyr - Mercury Zephyr indexer program

[!IMPORTANT]
If modifying contracts in ./contracts, run the make commands. Update SMART_WALLET_FACTORY and SMART_WALLET_WASM values from make deploy before running make init.

[!IMPORTANT]
The bindings in ./packages have been heavily modified. When rebuilding, prefer updating only the src/index.ts files in each package.

---

Resources

• Super Peach - Real-world implementation example
• Discord #passkeys - Questions and showcase