Omnichain template: add a task to call the contract from Bitcoin

[fadeev]

Either modify the interact task or introduce a new one that will allow calling the contract from Bitcoin.

This will require making sure that the logic behind send-btc can be called programmatically from the template.

toolkit/tasks/sendBTC.ts

Lines 101 to 144 in d7b6c52

	const main = async (args: any, hre: HardhatRuntimeEnvironment) => {
	const TESTNET = bitcoin.networks.testnet;
	const API = getEndpoints("blockcypher", "btc_testnet")[0].url;
	const pk = process.env.PRIVATE_KEY as any;
	const ECPair = ECPairFactory(ecc);
	const key = ECPair.fromPrivateKey(Buffer.from(pk, "hex"), {
	network: TESTNET,
	});
	const { address } = bitcoin.payments.p2wpkh({
	network: TESTNET,
	pubkey: key.publicKey,
	});
	if (address === undefined) throw new Error("Address is undefined");
	const utxos = await fetchUtxos(address);
	const tx = await makeTransaction(
	args.recipient,
	key,
	parseFloat(args.amount) * 100000000,
	utxos,
	address,
	args.memo
	);
	const decoded = JSON.stringify(await decodeTransaction(tx), null, 2);
	console.log(`\nTransaction:\n\n${tx}\n`);
	console.log(`Decoded transaction:\n\n${decoded}\n`);
	await confirm(
	{
	message: `Send ${parseFloat(args.amount)} tBTC to ${args.recipient}?`,
	},
	{ clearPromptOnDone: true }
	);
	const p1 = await fetch(`${API}/txs/push`, {
	body: JSON.stringify({ tx }),
	method: "POST",
	});
	const data = await p1.json();
	const txhash = data?.tx?.hash;
	console.log(`Transaction hash: ${txhash}`);
	};