Escrow

import {
  MnemonicIdentity,
  MultisigTapscript,
  CLTVMultisigTapscript,
  VtxoScript,
  networks,
} from '@arkade-os/sdk';

const buyer = MnemonicIdentity.fromMnemonic('abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about', { isMainnet: false });
const seller = MnemonicIdentity.fromMnemonic('zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong', { isMainnet: false });
const arbiter = MnemonicIdentity.fromMnemonic('legal winner thank year wave sausage worth useful legal winner thank yellow', { isMainnet: false });

const buyerPubkey = await buyer.xOnlyPublicKey();
const sellerPubkey = await seller.xOnlyPublicKey();
const arbiterPubkey = await arbiter.xOnlyPublicKey();

// Store refundAt with the contract: another value gives another address
const refundAt = BigInt(Math.floor(Date.now() / 1000)) + 30n * 86400n;

const releaseLeaf = MultisigTapscript.encode({
  pubkeys: [buyerPubkey, sellerPubkey, serverPubkey],
}).script;
const arbiterLeaf = MultisigTapscript.encode({
  pubkeys: [arbiterPubkey, serverPubkey],
}).script;
const refundLeaf = CLTVMultisigTapscript.encode({
  pubkeys: [buyerPubkey, serverPubkey],
  absoluteTimelock: refundAt,
}).script;
const exitLeaf = CSVMultisigTapscript.encode({
  pubkeys: [buyerPubkey, sellerPubkey],
  timelock: exitTimelock,
}).script;

const escrow = new VtxoScript([releaseLeaf, arbiterLeaf, refundLeaf, exitLeaf]);
console.log('Escrow address:', escrow.address(networks.mutinynet.hrp, serverPubkey).encode());

import { ArkAddress, Transaction, signAndSubmitOffchainTx } from '@arkade-os/sdk';

const { vtxos } = await indexerProvider.getVtxos({
  scripts: [hex.encode(escrow.pkScript)],
  spendableOnly: true,
});
if (vtxos.length === 0) throw new Error('Fund the escrow address first');
const vtxo = vtxos[0];

const sellerAddress = 'tark1...'; // the seller's Arkade address

const arkTxid = await signAndSubmitOffchainTx({
  identity: { sign: async (tx: Transaction) => seller.sign(await buyer.sign(tx)) },
  provider: arkProvider,
  inputs: [{
    ...vtxo,
    tapLeafScript: escrow.findLeaf(hex.encode(releaseLeaf)),
    tapTree: escrow.encode(),
  }],
  outputs: [{ amount: BigInt(vtxo.value), script: ArkAddress.decode(sellerAddress).pkScript }],
  serverUnrollScript,
});
console.log('Released:', arkTxid);