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Bitcoin Support

Keplr enables seamless interaction with Bitcoin Mainnet, Bitcoin Signet and Bitcoin Testnet. Dapp developers can access the window.keplr.bitcoin and window.bitcoin_keplr objects to leverage various methods for interactions.

Connecting to Keplr and Retrieving Bitcoin Accounts​

connectWallet​

Connect the current account and get the address of it.

Interface​

interface KeplrBitcoinProvider {
  connectWallet: () => Promise<string[]>; // return an array of address of current account
}

Example​

await window.bitcoin_keplr.connectWallet()
// ["bc1pwnhlsga02l88x8z6l3hgqwep9cakmsp67fh6t664p0juk9dfnd6qff48zw"]

requestAccounts​

Connect the current account and get the address of it.

Interface​

interface KeplrBitcoinProvider {
  requestAccounts: () => Promise<string[]>; // return an array of address of current account
}

Example​

await window.bitcoin_keplr.requestAccounts()
// ["bc1pwnhlsga02l88x8z6l3hgqwep9cakmsp67fh6t664p0juk9dfnd6qff48zw"]

getAccounts​

Get the address of current account. It will return empty array if the website isn't connected to Keplr.

Interface​

interface KeplrBitcoinProvider {
  getAccounts: () => Promise<string[]>; // return an array of address of current account
}

Example​

await window.bitcoin_keplr.getAccounts()
// ["bc1pwnhlsga02l88x8z6l3hgqwep9cakmsp67fh6t664p0juk9dfnd6qff48zw"]

getPublicKey​

Get the public key of current account.

Interface​

interface KeplrBitcoinProvider {
  getPublicKey: () => Promise<string>; // return a public key of current account
}

Example​

await window.bitcoin_keplr.getPublicKey()
// "02560453f4cf8e97515f7cfcdb337745aaddc952f0adf9f2583db402c1a6a6215e"

getAddress​

Get the address of current account.

Interface​

interface KeplrBitcoinProvider {
  getAddress: () => Promise<string>; // return a address of current account
}

Example​

await window.bitcoin_keplr.getAddress()
// "bc1pwnhlsga02l88x8z6l3hgqwep9cakmsp67fh6t664p0juk9dfnd6qff48zw"

disconnect​

Disconnect the current account.

Interface​

interface KeplrBitcoinProvider {
  disconnect: () => Promise<void>;
}

Example​

await window.bitcoin_keplr.disconnect()

Getting Bitcoin Balance​

getBalance​

Get balance of current account.

Interface​

interface KeplrBitcoinProvider {  
  getBalance: () => Promise<{
    confirmed: number; // the confirmed satoshis
    unconfirmed: number; // the unconfirmed satoshis
    total: number; // the total satoshis
  }>;
}

Example​

await window.bitcoin_keplr.getBalance()
// {
//   confirmed: 30000,
//   unconfirmed: 20000,
//   total: 50000
// }

getInscriptions​

Not implemented yet.

Getting Network Info and Switching Current Network​

getNetwork​

Get the current network.

Interface​

interface KeplrBitcoinProvider {  
  getNetwork: () => Promise<"livenet" | "signet" | "testnet">; // return a string of current network id
}

Example​

await window.bitcoin_keplr.getNetwork()
// "livenet"

switchNetwork​

Switch the current network.

Interface​

interface KeplrBitcoinProvider {  
  switchNetwork: (
    network: "livenet" | "signet" | "testnet"
  ) => Promise<"livenet" | "signet" | "testnet">; // return a network id to switch
}

Example​

await window.bitcoin_keplr.switchNetwork("signet")
// "signet"

getChain​

Get the current network info.

Interface​

interface KeplrBitcoinProvider {  
  getChain: () => Promise<{ // return the current network info
    enum: "BITCOIN_MAINNET" | "BITCOIN_SIGNET" | "BITCOIN_TESTNET";
    name: string;
    network: "mainnet" | "signet" | "testnet";
  }>;
}

Example​

await window.bitcoin_keplr.getChain()
// {
//   enum: "BITCOIN_TESTNET",
//   name: "Bitcoin Testnet",
//   network: "testnet"
// }

switchChain​

Switch current network.

Interface​

interface KeplrBitcoinProvider {  
  switchChain: (
    chain: "BITCOIN_MAINNET" | "BITCOIN_SIGNET" | "BITCOIN_TESTNET"
  ) => Promise<"BITCOIN_MAINNET" | "BITCOIN_SIGNET" | "BITCOIN_TESTNET">; // return a network enum to switch
}

Example​

await window.bitcoin_keplr.switchChain("BITCOIN_MAINNET")
// "BITCOIN_MAINNET"

Requesting Bitcoin Signatures​

signPsbt​

Signing psbt: this will traverse all inputs that match the current address to sign.

Interface​

interface KeplrBitcoinProvider {
  signPsbt: (
    psbtHex: string, // the hex string of psbt to sign
    options?: {
      autoFinalized?: boolean; // whether finalize psbt after signing, default is true
      toSignInputs?: Array<{ // specify which inputs to sign
        index: number; // which input to sign
        address?: string; // which corresponding private key to use for signing (at least specify either an address or a public key)
        publicKey?: string; // which corresponding private key to use for signing (at least specify either an address or a public key) 
        sighashTypes?: number[]; // sighash types for the input
        disableTweakSigner?: boolean; // set true to use original private key when signing taproot inputs, default is false
        useTweakedSigner?: boolean; // force whether to use tweaked signer. higher priority than disableTweakSigner
      }>;
    }
  ) => Promise<string>; // return a hex string of signed psbt
}

Example​

const psbtHex = "70736274ff01007d..." 
await window.bitcoin_keplr.signPsbt(psbtHex, {
  autoFinalized: false,
  toSignInputs: [{
    index: 1,
    address: "bc1pwnhlsga02l88x8z6l3hgqwep9cakmsp67fh6t664p0juk9dfnd6qff48zw",
  }]
})
// "70736274ff01007d..."

signPsbts​

Signing psbts: this will traverse all inputs that match the current address to sign.

Interface​

interface KeplrBitcoinProvider {
  signPsbts: (
    psbtsHexes: string[], // the hex strings of psbts to sign
    options?: {
      autoFinalized?: boolean; // whether finalize psbt after signing, default is true
      toSignInputs?: Array<{ // specify which inputs to sign
        index: number; // which input to sign
        address?: string; // which corresponding private key to use for signing (at least specify either an address or a public key)
        publicKey?: string; // which corresponding private key to use for signing (at least specify either an address or a public key) 
        sighashTypes?: number[]; // sighash types for the input
        disableTweakSigner?: boolean; // set true to use original private key when signing taproot inputs, default is false
        useTweakedSigner?: boolean; // force whether to use tweaked signer. higher priority than disableTweakSigner
      }>;
    }
  ) => Promise<string[]>; // return an array of hex strings of signed psbts
}

Example​

const psbtHex = "70736274ff01007d..." 
await window.bitcoin_keplr.signPsbt(psbtHex, {
  autoFinalized: false,
  toSignInputs: [{
    index: 1,
    address: "bc1pwnhlsga02l88x8z6l3hgqwep9cakmsp67fh6t664p0juk9dfnd6qff48zw",
  }]
})
// ["70736274ff01007d..."]

signMessage​

Sign a message using either ECDSA or BIP322-Simple signing method.

Interface​

interface KeplrBitcoinProvider {
  signMessage: (
    message: string, // a string to sign
    type?: "ecdsa" | "bip322-simple" // signing method type, default is "ecdsa"
  ) => Promise<string>; // return a signature of signed message
}

Example​

const message = "Hello Keplr" 
await window.bitcoin_keplr.signMessage(message)
// "AUACrYkJs6H1EWzKRzWYuLoHqpbGz47qbiurlRffBgl3mZvE7KLpdwYVkrChzkF8ycFHNJPpTl8gHG1Cd67WyNZO"

Sending Bitcoin Transaction​

sendBitcoin​

Send BTC

Interface​

interface KeplrBitcoinProvider {
  sendBitcoin: (
    to: string, // the address to send
    amount: number // the satoshis to send
  ) => Promise<string>; // return the tx id
}

Example​

await window.bitcoin_keplr.sendBitcoin("bc1pwnhlsga02l88x8z6l3hgqwep9cakmsp67fh6t664p0juk9dfnd6qff48zw", 10000)
// "acc16b5e9e69ea8f1de96d839a0e2cb9bc2ddc6dd8d19115f6bbfca81852aac2"

pushTx​

Push Transaction

Interface​

interface KeplrBitcoinProvider {
  pushTx: (
    rawTxHex: string // hex string of raw tx to push
  ) => Promise<string>; // return the tx id
}

Example​

const rawTxHex = "0200000000010135bd7d..."
await window.bitcoin_keplr.pushTx(rawTxHex)
// "acc16b5e9e69ea8f1de96d839a0e2cb9bc2ddc6dd8d19115f6bbfca81852aac2"

pushPsbt​

Push PSBT

Interface​

interface KeplrBitcoinProvider {
  pushPsbt: (
    psbtHex: string // hex string of psbt to push
  ) => Promise<string>; // return the tx id
}

Example​

const psbtHex = "70736274ff01007d..."
await window.bitcoin_keplr.pushPsbt(rawTxHex)
// "acc16b5e9e69ea8f1de96d839a0e2cb9bc2ddc6dd8d19115f6bbfca81852aac2"

Events​

The Bitcoin provider offers event listeners to track changes in accounts and network.

accountsChanged​

Listen for changes to the user's exposed account address.

Interface​

interface KeplrBitcoinProvider {
  on: (event: 'accountsChanged', handler: (accounts: Array<string>) => void) => void;
  off: (event: 'accountsChanged', handler: (accounts: Array<string>) => void) => void;
}

Example​

const handleAccountsChanged = (accounts) => {
  console.log('Accounts changed:', accounts);
};

// Add listener
window.bitcoin_keplr.on('accountsChanged', handleAccountsChanged);

// Remove listener
window.bitcoin_keplr.off('accountsChanged', handleAccountsChanged);

networkChanged​

Listen for changes to the current network.

Interface​

type BitcoinNetwork = "mainnet" | "signet" | "testnet";

interface KeplrBitcoinProvider {
  on: (event: 'networkChanged', handler: (network: BitcoinNetwork) => void) => void;
  off: (event: 'networkChanged', handler: (network: BitcoinNetwork) => void) => void;
}

Example​

const handleNetworkChanged = (network) => {
  console.log('Network changed:', network);
};

// Add listener
window.bitcoin_keplr.on('networkChanged', handleNetworkChanged);

// Remove listener
window.bitcoin_keplr.off('networkChanged', handleNetworkChanged);