Add support for vanity multisig addresses

src/address-formats/p2pkh.js

@@ -7,8 +7,8 @@ const p2pkh = {
 	bip39: '44'
 };
 
-p2pkh.derive = pubkey => {
-	const {address} = bitcoin.payments.p2pkh({pubkey});
+p2pkh.derive = ({publicKey}) => {
+	const {address} = bitcoin.payments.p2pkh({pubkey: publicKey});
 
 	return address;
 };

src/address-formats/p2sh.js

@@ -0,0 +1,17 @@
+const bitcoin = require('bitcoinjs-lib');
+const {base58} = require('./charsets');
+
+const p2sh = {
+	prefix: '3',
+	charset: base58
+};
+
+p2sh.derive = ({redeemScript}) => {
+	const {address} = bitcoin.payments.p2sh({
+		redeem: {output: redeemScript}
+	});
+
+	return address;
+};
+
+module.exports = p2sh;

src/address-formats/p2wpkh-p2sh.js

@@ -7,9 +7,9 @@ const p2wpkhp2sh = {
 	bip39: '49'
 };
 
-p2wpkhp2sh.derive = pubkey => {
+p2wpkhp2sh.derive = ({publicKey}) => {
 	const {address} = bitcoin.payments.p2sh({
-		redeem: bitcoin.payments.p2wpkh({pubkey})
+		redeem: bitcoin.payments.p2wpkh({pubkey: publicKey})
 	});
 
 	return address;

src/address-formats/p2wpkh.js

@@ -7,8 +7,8 @@ const p2wpkh = {
 	bip39: '84'
 };
 
-p2wpkh.derive = pubkey => {
-	const {address} = bitcoin.payments.p2wpkh({pubkey});
+p2wpkh.derive = ({publicKey}) => {
+	const {address} = bitcoin.payments.p2wpkh({pubkey: publicKey});
 
 	return address;
 };

src/index.js

@@ -5,13 +5,15 @@ const ONE_SECOND = 1000;
 const keyFormats = {
 	wif: require('./key-formats/wif'),
 	bip39: require('./key-formats/bip39'),
-	xpub: require('./key-formats/xpub')
+	xpub: require('./key-formats/xpub'),
+	multisig: require('./key-formats/multisig')
 };
 
 const addressFormats = {
 	p2pkh: require('./address-formats/p2pkh'),
 	'p2wpkh-p2sh': require('./address-formats/p2wpkh-p2sh'),
-	p2wpkh: require('./address-formats/p2wpkh')
+	p2wpkh: require('./address-formats/p2wpkh'),
+	p2sh: require('./address-formats/p2sh')
 };
 
 class Vain extends Emitter {
@@ -65,7 +67,7 @@ class Vain extends Emitter {
 			attempts++;
 
 			keyData = generateKey({...options, addressFormat, attempts});
-			address = addressFormat.derive(keyData.publicKey);
+			address = addressFormat.derive(keyData);
 
 			if (address.startsWith(this.prefix)) {
 				found = true;

src/key-formats/multisig.js

@@ -0,0 +1,21 @@
+const bitcoin = require('bitcoinjs-lib');
+
+const generateRedeemScript = ({pubkeys, m}) => {
+	const keyPair = bitcoin.ECPair.makeRandom();
+	const {publicKey} = keyPair;
+	let redeemScript;
+	let n;
+	({output: redeemScript, m, n, pubkeys} = bitcoin.payments.p2ms({
+		pubkeys: [
+			...pubkeys,
+			publicKey
+		],
+		m
+	}));
+
+	const format = () => ({redeemScript, m, n, pubkeys});
+
+	return {redeemScript, format};
+};
+
+module.exports = generateRedeemScript;