diff --git a/bench/index.js b/bench/index.js
index 541126a..b041cd5 100644
--- a/bench/index.js
+++ b/bench/index.js
@@ -75,5 +75,5 @@ options.forEach(options => {
 		console.log(`Speed: ${data.addressesPerSecond.toLocaleString()} addr/s`);
 	});
 
-	vain.start();
+	vain.generate();
 });
diff --git a/src/index.js b/src/index.js
index 36741d6..e00ea9e 100644
--- a/src/index.js
+++ b/src/index.js
@@ -32,55 +32,53 @@ class Vain extends Emitter {
 		this.prefix = `${this.addressFormat.prefix}${prefix}`;
 	}
 
-	start() {
-		return new Promise(resolve => {
-			const startTime = Date.now();
-
-			const {generateKey, addressFormat} = this;
-
-			let found;
-			let attempts = 0;
-			let keyData;
-			let address;
-			let lastUpdate = Date.now();
-
-			while (!found) {
-				attempts++;
-
-				keyData = generateKey({addressFormat});
-				address = addressFormat.derive(keyData.publicKey);
-
-				if (address.startsWith(this.prefix)) {
-					found = true;
-				}
-
-				const now = Date.now();
-				if ((now - lastUpdate) > ONE_SECOND) {
-					const duration = now - startTime;
-					const addressesPerSecond = Math.floor(attempts / (duration / ONE_SECOND));
-					this.emit('update', {
-						duration,
-						attempts,
-						addressesPerSecond
-					});
-					lastUpdate = now;
-				}
+	generate() {
+		const startTime = Date.now();
+
+		const {generateKey, addressFormat} = this;
+
+		let found;
+		let attempts = 0;
+		let keyData;
+		let address;
+		let lastUpdate = Date.now();
+
+		while (!found) {
+			attempts++;
+
+			keyData = generateKey({addressFormat});
+			address = addressFormat.derive(keyData.publicKey);
+
+			if (address.startsWith(this.prefix)) {
+				found = true;
 			}
 
-			const endTime = Date.now();
-			const duration = endTime - startTime;
-			const addressesPerSecond = Math.floor(attempts / (duration / ONE_SECOND));
-
-			const result = {
-				duration,
-				attempts,
-				addressesPerSecond,
-				address,
-				...keyData.format()
-			};
-			this.emit('found', result);
-			resolve(result);
-		});
+			const now = Date.now();
+			if ((now - lastUpdate) > ONE_SECOND) {
+				const duration = now - startTime;
+				const addressesPerSecond = Math.floor(attempts / (duration / ONE_SECOND));
+				this.emit('update', {
+					duration,
+					attempts,
+					addressesPerSecond
+				});
+				lastUpdate = now;
+			}
+		}
+
+		const endTime = Date.now();
+		const duration = endTime - startTime;
+		const addressesPerSecond = Math.floor(attempts / (duration / ONE_SECOND));
+
+		const result = {
+			duration,
+			attempts,
+			addressesPerSecond,
+			address,
+			...keyData.format()
+		};
+		this.emit('found', result);
+		return result;
 	}
 }
 
diff --git a/test/unit.js b/test/unit.js
index b434b41..54bf729 100644
--- a/test/unit.js
+++ b/test/unit.js
@@ -7,13 +7,13 @@ test('Vain is exported', t => {
 	t.not(Vain, undefined);
 });
 
-test('Vain derives a p2pkh vanity address', async t => {
+test('Vain derives a p2pkh vanity address', t => {
 	const options = {
 		addressFormat: 'p2pkh',
 		prefix: 'A'
 	};
 	const vain = new Vain(options);
-	const {address, wif} = await vain.start();
+	const {address, wif} = vain.generate();
 
 	const keyPair = bitcoin.ECPair.fromWIF(wif);
 	const {address: wifAddress} = bitcoin.payments.p2pkh({pubkey: keyPair.publicKey});
@@ -22,13 +22,13 @@ test('Vain derives a p2pkh vanity address', async t => {
 	t.is(address, wifAddress);
 });
 
-test('Vain derives a p2wpkh-p2sh vanity address', async t => {
+test('Vain derives a p2wpkh-p2sh vanity address', t => {
 	const options = {
 		addressFormat: 'p2wpkh-p2sh',
 		prefix: 'A'
 	};
 	const vain = new Vain(options);
-	const {address, wif} = await vain.start();
+	const {address, wif} = vain.generate();
 
 	const keyPair = bitcoin.ECPair.fromWIF(wif);
 	const {address: wifAddress} = bitcoin.payments.p2sh({
@@ -39,13 +39,13 @@ test('Vain derives a p2wpkh-p2sh vanity address', async t => {
 	t.is(address, wifAddress);
 });
 
-test('Vain derives a p2wpkh vanity address', async t => {
+test('Vain derives a p2wpkh vanity address', t => {
 	const options = {
 		addressFormat: 'p2wpkh',
 		prefix: 'a'
 	};
 	const vain = new Vain(options);
-	const {address, wif} = await vain.start();
+	const {address, wif} = vain.generate();
 
 	const keyPair = bitcoin.ECPair.fromWIF(wif);
 	const {address: wifAddress} = bitcoin.payments.p2wpkh({pubkey: keyPair.publicKey});
@@ -61,7 +61,7 @@ test('Vain derives a p2pkh vanity seed', async t => {
 		prefix: 'A'
 	};
 	const vain = new Vain(options);
-	const {address, derivationPath, mnemonic} = await vain.start();
+	const {address, derivationPath, mnemonic} = vain.generate();
 
 	const seed = await bip39.mnemonicToSeed(mnemonic);
 	const node = bitcoin.bip32.fromSeed(seed);
@@ -79,7 +79,7 @@ test('Vain derives a p2wpkh-p2sh vanity seed', async t => {
 		prefix: 'A'
 	};
 	const vain = new Vain(options);
-	const {address, derivationPath, mnemonic} = await vain.start();
+	const {address, derivationPath, mnemonic} = vain.generate();
 
 	const seed = await bip39.mnemonicToSeed(mnemonic);
 	const node = bitcoin.bip32.fromSeed(seed);
@@ -99,7 +99,7 @@ test('Vain derives a p2wpkh vanity seed', async t => {
 		prefix: 'a'
 	};
 	const vain = new Vain(options);
-	const {address, derivationPath, mnemonic} = await vain.start();
+	const {address, derivationPath, mnemonic} = vain.generate();
 
 	const seed = await bip39.mnemonicToSeed(mnemonic);
 	const node = bitcoin.bip32.fromSeed(seed);
@@ -110,12 +110,12 @@ test('Vain derives a p2wpkh vanity seed', async t => {
 	t.is(address, seedAddress);
 });
 
-test('Vain defaults to p2pkh if no address format is set', async t => {
+test('Vain defaults to p2pkh if no address format is set', t => {
 	const options = {
 		prefix: 'A'
 	};
 	const vain = new Vain(options);
-	const {address, wif} = await vain.start();
+	const {address, wif} = vain.generate();
 
 	const keyPair = bitcoin.ECPair.fromWIF(wif);
 	const {address: wifAddress} = bitcoin.payments.p2pkh({pubkey: keyPair.publicKey});