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‎btc-p2sh/nodejs/.env.example

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LIT_CAPACITY_CREDIT_TOKEN_ID=
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PKP_PUBLIC_KEY_1=
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PKP_PUBLIC_KEY_2=
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ETHEREUM_PRIVATE_KEY=
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LIT_NETWORK=
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BTC_DESTINATION_ADDRESS=

‎btc-p2sh/nodejs/.mocharc.json

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{
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"$schema": "https://json.schemastore.org/mocharc.json",
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"require": "tsx"
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}

‎btc-p2sh/nodejs/README.md

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# Bitcoin (P2SH) Transactions with Lit Protocol
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These examples demonstrate how to use Lit Protocol PKPs (Programmable Key Pairs) to execute Bitcoin (P2SH) transactions.
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## Prerequisites
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Before compiling and trying this example out, there are a few things you'll need to prepare.
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1. You will need to mint a PKP. The fastest way to do this is through the [Lit Explorer](https://explorer.litprotocol.com/). Please make sure you mint the PKP on the same network you run the example on.
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2. An Ethereum wallet. Please make sure that this wallet was used to mint the PKP, and therefore has ownership of it.
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3. The Bitcoin address derived from the PKP(s) must have a UTXO. Without a UTXO, the PKP will be unable to send any Bitcoin and this example will fail. Visit the [docs](https://developer.litprotocol.com/user-wallets/pkps/bitcoin/overview) for more information.
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4. Choose one of the four P2SH examples to run. This can be done at the bottom of the `executeBtcSigning` function in `src/index.ts`. Just uncomment the function you want to run.
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## Running the Example
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Once the prerequisites are met, you can run the code by running the following commands:
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Install dependencies:
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```yarn```
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Run the code:
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```yarn test```

‎btc-p2sh/nodejs/package.json

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{
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"name": "btc-p2sh-example",
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"version": "0.1.0",
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"description": "Examples of P2SH transactions with Lit Protocol PKPs",
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"type": "module",
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"scripts": {
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"test": "npx @dotenvx/dotenvx run -- mocha test/**/*.spec.ts"
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},
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"dependencies": {
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"@lit-protocol/constants": "^6.6.0",
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"@lit-protocol/lit-node-client": "^6.6.0",
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"@mempool/mempool.js": "^2.3.0",
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"@simplewebauthn/browser": "^10.0.0",
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"@types/elliptic": "^6.4.18",
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"@types/express": "^4.17.21",
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"@types/node": "^22.5.5",
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"bip66": "^2.0.0",
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"bitcoinjs-lib": "^7.0.0-rc.0",
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"bn.js": "^5.2.1",
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"ecpair": "^3.0.0-rc.0",
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"elliptic": "^6.5.7",
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"node-fetch": "^3.3.2",
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"tiny-secp256k1": "^2.2.3"
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},
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"devDependencies": {
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"@types/chai": "^4.3.16",
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"@types/chai-json-schema": "^1.4.10",
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"@types/mocha": "^10.0.6",
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"chai": "^5.1.1",
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"chai-json-schema": "^1.5.1",
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"mocha": "^10.4.0",
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"tsc": "^2.0.4",
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"tsx": "^4.12.0",
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"typescript": "^5.5.3"
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}
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}

‎btc-p2sh/nodejs/src/index.ts

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import { LitNodeClient } from "@lit-protocol/lit-node-client";
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import { LitNetwork, LIT_RPC, } from "@lit-protocol/constants";
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import {
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createSiweMessageWithRecaps,
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generateAuthSig,
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LitAbility,
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LitActionResource,
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LitPKPResource,
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} from "@lit-protocol/auth-helpers";
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import { LitContracts } from "@lit-protocol/contracts-sdk";
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import { LIT_NETWORKS_KEYS } from "@lit-protocol/types";
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import * as ethers from "ethers";
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import { getEnv } from "./utils/utils";
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import { singleSig } from "./p2sh/single-sig";
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import { multiSig } from "./p2sh/multi-sig";
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import { oneOfOneMultiSig } from "./p2sh/1of1-multi-sig";
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import { collaborativeMultiSig } from "./p2sh/collaborative";
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const PKP_PUBLIC_KEY_1 = getEnv("PKP_PUBLIC_KEY_1");
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const PKP_PUBLIC_KEY_2 = getEnv("PKP_PUBLIC_KEY_2");
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const ETHEREUM_PRIVATE_KEY = getEnv("ETHEREUM_PRIVATE_KEY");
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const BTC_DESTINATION_ADDRESS = getEnv("BTC_DESTINATION_ADDRESS");
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const LIT_NETWORK = process.env["LIT_NETWORK"] as LIT_NETWORKS_KEYS || LitNetwork.Datil;
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const LIT_CAPACITY_CREDIT_TOKEN_ID = process.env["LIT_CAPACITY_CREDIT_TOKEN_ID"];
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const ethersWallet = new ethers.Wallet(
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ETHEREUM_PRIVATE_KEY,
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new ethers.providers.JsonRpcProvider(LIT_RPC.CHRONICLE_YELLOWSTONE)
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);
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const address = ethersWallet.address;
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export const executeBtcSigning = async () => {
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let litNodeClient: LitNodeClient;
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try {
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litNodeClient = new LitNodeClient({
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litNetwork: LIT_NETWORK,
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debug: false,
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});
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await litNodeClient.connect();
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const litContracts = new LitContracts({
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signer: ethersWallet,
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network: LIT_NETWORK,
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debug: false,
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});
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await litContracts.connect();
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let capacityTokenId = LIT_CAPACITY_CREDIT_TOKEN_ID;
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if (!capacityTokenId) {
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console.log("🔄 No Capacity Credit provided, minting a new one...");
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const mintResult = await litContracts.mintCapacityCreditsNFT({
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requestsPerKilosecond: 10,
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daysUntilUTCMidnightExpiration: 1,
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});
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capacityTokenId = mintResult.capacityTokenIdStr;
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console.log(`✅ Minted new Capacity Credit with ID: ${capacityTokenId}`);
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} else {
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console.log(`ℹ️ Using provided Capacity Credit with ID: ${LIT_CAPACITY_CREDIT_TOKEN_ID}`);
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}
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console.log("🔄 Creating capacityDelegationAuthSig...");
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const { capacityDelegationAuthSig } =
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await litNodeClient.createCapacityDelegationAuthSig({
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dAppOwnerWallet: ethersWallet,
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capacityTokenId,
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delegateeAddresses: [address],
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uses: "1",
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});
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console.log("✅ Capacity Delegation Auth Sig created");
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console.log("🔄 Getting Session Signatures...");
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const sessionSigs = await litNodeClient.getSessionSigs({
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chain: "ethereum",
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expiration: new Date(Date.now() + 1000 * 60 * 60 * 24).toISOString(), // 24 hours
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capabilityAuthSigs: [capacityDelegationAuthSig],
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resourceAbilityRequests: [
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{
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resource: new LitPKPResource("*"),
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ability: LitAbility.PKPSigning,
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},
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{
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resource: new LitActionResource("*"),
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ability: LitAbility.LitActionExecution,
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},
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],
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authNeededCallback: async ({
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resourceAbilityRequests,
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expiration,
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uri,
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}) => {
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const toSign = await createSiweMessageWithRecaps({
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uri: uri!,
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expiration: expiration!,
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resources: resourceAbilityRequests!,
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walletAddress: address,
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nonce: await litNodeClient!.getLatestBlockhash(),
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litNodeClient,
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});
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return await generateAuthSig({
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signer: ethersWallet,
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toSign,
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});
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},
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});
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console.log("✅ Got Session Signatures");
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console.log("🔄 Executing Bitcoin Transaction...");
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return await singleSig(litNodeClient, sessionSigs, PKP_PUBLIC_KEY_1, BTC_DESTINATION_ADDRESS);
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/**
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* Single Sig P2SH:
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return await singleSig(litNodeClient, sessionSigs, PKP_PUBLIC_KEY_1, BTC_DESTINATION_ADDRESS);
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* Multi Sig P2SH:
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return await multiSig(litNodeClient, sessionSigs, PKP_PUBLIC_KEY_1, PKP_PUBLIC_KEY_2, BTC_DESTINATION_ADDRESS);
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* 1of1 Multi Sig P2SH:
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return await oneOfOneMultiSig(litNodeClient, sessionSigs, PKP_PUBLIC_KEY_1, PKP_PUBLIC_KEY_2, BTC_DESTINATION_ADDRESS);
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* Collaborative Multi Sig P2SH:
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return await collaborativeMultiSig(litNodeClient, sessionSigs, PKP_PUBLIC_KEY_1, PKP_PUBLIC_KEY_2, BTC_DESTINATION_ADDRESS);
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*/
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} catch (error) {
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console.error(error);
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} finally {
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litNodeClient!.disconnect();
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}
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};

‎btc-p2sh/nodejs/src/p2sh/1of1-multi-sig.ts

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import * as bitcoin from "bitcoinjs-lib";
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import * as ecc from "tiny-secp256k1";
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import mempoolJS from "@mempool/mempool.js";
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import { LitNodeClient } from "@lit-protocol/lit-node-client";
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import { convertSignature, broadcastTransaction } from "../utils/utils";
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import { litActionCode } from "../utils/litAction";
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bitcoin.initEccLib(ecc);
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export async function oneOfOneMultiSig(litNodeClient: LitNodeClient, sessionSigs: any, pkpPublicKey1: string, pkpPublicKey2: string, destinationAddress: string) {
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const network = bitcoin.networks.bitcoin;
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const pubKeyBuffer_1 = Buffer.from(pkpPublicKey1, "hex");
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const pubKeyBuffer_2 = Buffer.from(pkpPublicKey2, "hex");
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const redeemScript = bitcoin.script.compile([
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bitcoin.opcodes.OP_1,
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pubKeyBuffer_1,
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pubKeyBuffer_2,
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bitcoin.opcodes.OP_2,
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bitcoin.opcodes.OP_CHECKMULTISIG,
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]);
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const p2shPayment = bitcoin.payments.p2sh({
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redeem: { output: redeemScript },
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network: network,
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});
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const { bitcoin: { addresses, transactions } } = mempoolJS({
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hostname: "mempool.space",
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network: "mainnet",
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});
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const addressUtxos = await addresses.getAddressTxsUtxo({
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address: p2shPayment.address!,
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});
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console.log("P2SH Address:", p2shPayment.address);
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if (addressUtxos.length === 0) {
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console.log("No UTXOs found for address:", p2shPayment.address);
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return;
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}
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const utxo = addressUtxos[0];
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const psbt = new bitcoin.Psbt({ network });
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const utxoRawTx = await transactions.getTxHex({ txid: utxo.txid });
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psbt.addInput({
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hash: utxo.txid,
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index: utxo.vout,
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nonWitnessUtxo: Buffer.from(utxoRawTx, "hex"),
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redeemScript: redeemScript,
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});
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const fee = 1000;
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const amountToSend = utxo.value - fee;
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psbt.addOutput({
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address: destinationAddress,
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value: BigInt(amountToSend),
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});
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//@ts-ignore
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const tx = psbt.__CACHE.__TX.clone();
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const sighash = tx.hashForSignature(
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0,
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redeemScript,
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bitcoin.Transaction.SIGHASH_ALL
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);
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const litActionResponse = await litNodeClient.executeJs({
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code: litActionCode,
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sessionSigs,
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jsParams: {
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publicKey: pkpPublicKey1,
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toSign: Buffer.from(sighash, "hex"),
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},
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});
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const signatureWithHashType = await convertSignature(
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litActionResponse.signatures.btcSignature
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);
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psbt.updateInput(0, {
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finalScriptSig: bitcoin.script.compile([
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bitcoin.opcodes.OP_0,
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signatureWithHashType,
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redeemScript,
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]),
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});
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const txHex = psbt.extractTransaction().toHex();
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return await broadcastTransaction(txHex);
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}

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