diff --git a/README.md b/README.md
index 9dbd68d..e01a155 100644
--- a/README.md
+++ b/README.md
@@ -11,14 +11,18 @@ Javascript library for BLS (Boneh-Lynn-Shacham) signatures and signature aggrega
 ## Usage
 
 ```ts
-import {PrivateKey} from "@chainsafe/bls";
+import bls, {init} from "@chainsafe/bls";
 
-const secretKey = PrivateKey.fromKeygen();
-const publicKey = secretKey.toPublicKey();
-const message = new Uint8Array(32);
+(async () => {
+  await init("herumi");
 
-const signature = secretKey.sign(message);
-console.log("Is valid: ", signature.verify(publicKey, message));
+  const secretKey = bls.PrivateKey.fromKeygen();
+  const publicKey = secretKey.toPublicKey();
+  const message = new Uint8Array(32);
+
+  const signature = secretKey.sign(message);
+  console.log("Is valid: ", signature.verify(publicKey, message));
+})();
 ```
 
 ### Browser
diff --git a/src/blst/index.ts b/src/blst/index.ts
index f2093cf..75af81d 100644
--- a/src/blst/index.ts
+++ b/src/blst/index.ts
@@ -7,7 +7,7 @@ import {functionalInterfaceFactory} from "../functional";
 
 export {PrivateKey, PublicKey, Signature};
 
-export async function initBLS(): Promise<void> {
+export async function init(): Promise<void> {
   // Native bindings require no init() call
 }
 export function destroy(): void {
@@ -20,7 +20,7 @@ export const bls: IBls = {
   Signature,
 
   ...functionalInterfaceFactory({PrivateKey, PublicKey, Signature}),
-  initBLS,
+  init,
   destroy,
 };
 
diff --git a/src/blst/privateKey.ts b/src/blst/privateKey.ts
index c9d7a29..aeafde8 100644
--- a/src/blst/privateKey.ts
+++ b/src/blst/privateKey.ts
@@ -26,7 +26,7 @@ export class PrivateKey implements IPrivateKey {
     return new PrivateKey(sk);
   }
 
-  signMessage(message: Uint8Array): Signature {
+  sign(message: Uint8Array): Signature {
     return new Signature(this.value.sign(message));
   }
 
@@ -36,8 +36,8 @@ export class PrivateKey implements IPrivateKey {
     return new PublicKey(affine, jacobian);
   }
 
-  toBytes(): Buffer {
-    return Buffer.from(this.value.toBytes());
+  toBytes(): Uint8Array {
+    return this.value.toBytes();
   }
 
   toHex(): string {
diff --git a/src/blst/publicKey.ts b/src/blst/publicKey.ts
index ee28c5c..6301cf2 100644
--- a/src/blst/publicKey.ts
+++ b/src/blst/publicKey.ts
@@ -32,8 +32,8 @@ export class PublicKey implements IPublicKey {
     return signature.verify(this, message);
   }
 
-  toBytes(): Buffer {
-    return Buffer.from(this.affine.toBytes());
+  toBytes(): Uint8Array {
+    return this.affine.toBytes();
   }
 
   toHex(): string {
diff --git a/src/blst/signature.ts b/src/blst/signature.ts
index 5bad9d1..8316c96 100644
--- a/src/blst/signature.ts
+++ b/src/blst/signature.ts
@@ -39,8 +39,8 @@ export class Signature implements ISignature {
     );
   }
 
-  toBytes(): Buffer {
-    return Buffer.from(this.affine.toBytes());
+  toBytes(): Uint8Array {
+    return this.affine.toBytes();
   }
 
   toHex(): string {
diff --git a/src/constants.ts b/src/constants.ts
index cf34046..1169bdd 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -3,5 +3,5 @@ export const SIGNATURE_LENGTH = 96;
 export const FP_POINT_LENGTH = 48;
 export const PUBLIC_KEY_LENGTH = FP_POINT_LENGTH;
 export const G2_HASH_PADDING = 16;
-export const EMPTY_PUBLIC_KEY = Buffer.alloc(PUBLIC_KEY_LENGTH);
-export const EMPTY_SIGNATURE = Buffer.alloc(SIGNATURE_LENGTH);
+export const EMPTY_PUBLIC_KEY = Uint8Array.from(Buffer.alloc(PUBLIC_KEY_LENGTH));
+export const EMPTY_SIGNATURE = Uint8Array.from(Buffer.alloc(SIGNATURE_LENGTH));
diff --git a/src/functional.ts b/src/functional.ts
index ddc84bc..7c7be12 100644
--- a/src/functional.ts
+++ b/src/functional.ts
@@ -13,18 +13,18 @@ export function functionalInterfaceFactory({
    * @param secretKey
    * @param messageHash
    */
-  function sign(secretKey: Uint8Array, messageHash: Uint8Array): Buffer {
+  function sign(secretKey: Uint8Array, messageHash: Uint8Array): Uint8Array {
     assert(secretKey, "secretKey is null or undefined");
     assert(messageHash, "messageHash is null or undefined");
     const privateKey = PrivateKey.fromBytes(secretKey);
-    return privateKey.signMessage(messageHash).toBytes();
+    return privateKey.sign(messageHash).toBytes();
   }
 
   /**
    * Compines all given signature into one.
    * @param signatures
    */
-  function aggregateSignatures(signatures: Uint8Array[]): Buffer {
+  function aggregateSignatures(signatures: Uint8Array[]): Uint8Array {
     const agg = Signature.aggregate(signatures.map((p) => Signature.fromBytes(p)));
     return agg.toBytes();
   }
@@ -33,7 +33,7 @@ export function functionalInterfaceFactory({
    * Combines all given public keys into single one
    * @param publicKeys
    */
-  function aggregatePubkeys(publicKeys: Uint8Array[]): Buffer {
+  function aggregatePubkeys(publicKeys: Uint8Array[]): Uint8Array {
     const agg = PublicKey.aggregate(publicKeys.map((p) => PublicKey.fromBytes(p)));
     return agg.toBytes();
   }
diff --git a/src/herumi/context.ts b/src/herumi/context.ts
index 0ac15fb..a35a59f 100644
--- a/src/herumi/context.ts
+++ b/src/herumi/context.ts
@@ -13,7 +13,7 @@ export async function setupBls(): Promise<void> {
 }
 
 // Cache a promise for Bls instead of Bls to make sure it is initialized only once
-export async function initBLS(): Promise<void> {
+export async function init(): Promise<void> {
   if (!blsGlobalPromise) {
     blsGlobalPromise = setupBls();
   }
diff --git a/src/herumi/index.ts b/src/herumi/index.ts
index 67b5688..ce40cfc 100644
--- a/src/herumi/index.ts
+++ b/src/herumi/index.ts
@@ -1,11 +1,11 @@
 import {PrivateKey} from "./privateKey";
 import {PublicKey} from "./publicKey";
 import {Signature} from "./signature";
-import {initBLS, destroy} from "./context";
+import {init, destroy} from "./context";
 import {IBls} from "../interface";
 import {functionalInterfaceFactory} from "../functional";
 
-export {PrivateKey, PublicKey, Signature, initBLS, destroy};
+export {PrivateKey, PublicKey, Signature, init, destroy};
 
 const bls: IBls = {
   PrivateKey,
@@ -13,7 +13,7 @@ const bls: IBls = {
   Signature,
 
   ...functionalInterfaceFactory({PrivateKey, PublicKey, Signature}),
-  initBLS,
+  init,
   destroy,
 };
 
diff --git a/src/herumi/privateKey.ts b/src/herumi/privateKey.ts
index 4e1a91e..9b8b8d6 100644
--- a/src/herumi/privateKey.ts
+++ b/src/herumi/privateKey.ts
@@ -19,7 +19,7 @@ export class PrivateKey implements IPrivateKey {
     assert(bytes.length === SECRET_KEY_LENGTH, "Private key should have 32 bytes");
     const context = getContext();
     const secretKey = new context.SecretKey();
-    secretKey.deserialize(Buffer.from(bytes));
+    secretKey.deserialize(bytes);
     return new PrivateKey(secretKey);
   }
 
@@ -32,7 +32,7 @@ export class PrivateKey implements IPrivateKey {
     return this.fromBytes(sk);
   }
 
-  signMessage(message: Uint8Array): Signature {
+  sign(message: Uint8Array): Signature {
     return new Signature(this.value.sign(message));
   }
 
@@ -40,8 +40,8 @@ export class PrivateKey implements IPrivateKey {
     return new PublicKey(this.value.getPublicKey());
   }
 
-  toBytes(): Buffer {
-    return Buffer.from(this.value.serialize());
+  toBytes(): Uint8Array {
+    return this.value.serialize();
   }
 
   toHex(): string {
diff --git a/src/herumi/publicKey.ts b/src/herumi/publicKey.ts
index d889eeb..79532c3 100644
--- a/src/herumi/publicKey.ts
+++ b/src/herumi/publicKey.ts
@@ -47,8 +47,8 @@ export class PublicKey implements IPublicKey {
     return this.value.verify(signature.value, messageHash);
   }
 
-  toBytes(): Buffer {
-    return Buffer.from(this.value.serialize());
+  toBytes(): Uint8Array {
+    return this.value.serialize();
   }
 
   toHex(): string {
diff --git a/src/herumi/signature.ts b/src/herumi/signature.ts
index 9198d43..13995c9 100644
--- a/src/herumi/signature.ts
+++ b/src/herumi/signature.ts
@@ -64,8 +64,8 @@ export class Signature implements ISignature {
     );
   }
 
-  toBytes(): Buffer {
-    return Buffer.from(this.value.serialize());
+  toBytes(): Uint8Array {
+    return this.value.serialize();
   }
 
   toHex(): string {
diff --git a/src/index.ts b/src/index.ts
index 9a5d642..99476e6 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -3,17 +3,13 @@ import blsHerumi from "./herumi";
 
 export type Implementation = "herumi" | "blst-native";
 
-// This proxy makes sure a nice error is printed if BLS is used before init()
-export let bls: IBls = new Proxy({} as IBls, {
-  get: function () {
-    throw Error("BLS not initialized, call init() before");
-  },
-});
+// TODO: Use a Proxy for example to throw an error if it's not initialized yet
+export let bls: IBls;
 
 async function getImplementation(impl: Implementation) {
   switch (impl) {
     case "herumi":
-      await blsHerumi.initBLS();
+      await blsHerumi.init();
       return blsHerumi;
 
     case "blst-native":
diff --git a/src/interface.ts b/src/interface.ts
index 0b4aebf..ee34ad2 100644
--- a/src/interface.ts
+++ b/src/interface.ts
@@ -15,14 +15,14 @@ export interface IBls {
     aggregate(signatures: ISignature[]): ISignature;
   };
 
-  sign(secretKey: Uint8Array, messageHash: Uint8Array): Buffer;
-  aggregatePubkeys(publicKeys: Uint8Array[]): Buffer;
-  aggregateSignatures(signatures: Uint8Array[]): Buffer;
+  sign(secretKey: Uint8Array, messageHash: Uint8Array): Uint8Array;
+  aggregatePubkeys(publicKeys: Uint8Array[]): Uint8Array;
+  aggregateSignatures(signatures: Uint8Array[]): Uint8Array;
   verify(publicKey: Uint8Array, messageHash: Uint8Array, signature: Uint8Array): boolean;
   verifyAggregate(publicKeys: Uint8Array[], messageHash: Uint8Array, signature: Uint8Array): boolean;
   verifyMultiple(publicKeys: Uint8Array[], messageHashes: Uint8Array[], signature: Uint8Array): boolean;
 
-  initBLS(): Promise<void>;
+  init(): Promise<void>;
   destroy(): void;
 }
 
@@ -32,12 +32,12 @@ export interface IKeypair {
 }
 
 export interface IPublicKey {
-  toBytes(): Buffer;
+  toBytes(): Uint8Array;
   toHex(): string;
 }
 
 export interface ISignature {
-  toBytes(): Buffer;
+  toBytes(): Uint8Array;
   toHex(): string;
   verify(publicKey: IPublicKey, message: Uint8Array): boolean;
   verifyAggregate(publicKeys: IPublicKey[], message: Uint8Array): boolean;
@@ -46,7 +46,7 @@ export interface ISignature {
 
 export interface IPrivateKey {
   toPublicKey(): IPublicKey;
-  signMessage(message: Uint8Array): ISignature;
-  toBytes(): Buffer;
+  sign(message: Uint8Array): ISignature;
+  toBytes(): Uint8Array;
   toHex(): string;
 }
diff --git a/test/benchmark/index.ts b/test/benchmark/index.ts
index 18dc9ed..dd50290 100644
--- a/test/benchmark/index.ts
+++ b/test/benchmark/index.ts
@@ -4,7 +4,7 @@ import {runForAllImplementations} from "../switch";
 import {IPublicKey, ISignature} from "../../src/interface";
 
 runForAllImplementations(async (bls, implementation) => {
-  await bls.initBLS();
+  await bls.init();
 
   const aggCount = 30;
 
@@ -17,7 +17,7 @@ runForAllImplementations(async (bls, implementation) => {
       const msg = randomMsg();
       const sk = bls.PrivateKey.fromKeygen();
       const pk = sk.toPublicKey();
-      const sig = sk.signMessage(msg);
+      const sig = sk.sign(msg);
       return {
         input: {pk, msg, sig},
         resultCheck: (valid) => valid === true,
@@ -38,7 +38,7 @@ runForAllImplementations(async (bls, implementation) => {
       const dataArr = range(aggCount).map(() => {
         const sk = bls.PrivateKey.fromKeygen();
         const pk = sk.toPublicKey();
-        const sig = sk.signMessage(msg);
+        const sig = sk.sign(msg);
         return {pk, sig};
       });
 
@@ -79,7 +79,7 @@ runForAllImplementations(async (bls, implementation) => {
       const msg = randomMsg();
       const sigs = range(aggCount).map(() => {
         const sk = bls.PrivateKey.fromKeygen();
-        return sk.signMessage(msg);
+        return sk.sign(msg);
       });
       return {
         input: sigs,
diff --git a/test/switch.ts b/test/switch.ts
index 66a6f45..942f6ae 100644
--- a/test/switch.ts
+++ b/test/switch.ts
@@ -27,7 +27,7 @@ export function describeForAllImplementations(callback: (bls: IBls) => void): vo
   runForAllImplementations((bls, implementation) => {
     describe(implementation, () => {
       before(async () => {
-        await bls.initBLS();
+        await bls.init();
       });
 
       callback(bls);
diff --git a/test/unit/index.test.ts b/test/unit/index.test.ts
index b7ef13b..68714ea 100644
--- a/test/unit/index.test.ts
+++ b/test/unit/index.test.ts
@@ -8,7 +8,7 @@ export function runIndexTests(bls: IBls): void {
     const sk = bls.PrivateKey.fromKeygen();
     const pk = sk.toPublicKey();
     const msg = randomMessage();
-    const sig = sk.signMessage(msg);
+    const sig = sk.sign(msg);
     return {sk, pk, msg, sig};
   }
 
@@ -51,12 +51,7 @@ export function runIndexTests(bls: IBls): void {
       const msgs = getN(2, () => randomMessage());
       const pks = sks.map((sk) => sk.toPublicKey());
 
-      const sigs = [
-        sks[0].signMessage(msgs[0]),
-        sks[1].signMessage(msgs[0]),
-        sks[2].signMessage(msgs[1]),
-        sks[3].signMessage(msgs[1]),
-      ];
+      const sigs = [sks[0].sign(msgs[0]), sks[1].sign(msgs[0]), sks[2].sign(msgs[1]), sks[3].sign(msgs[1])];
 
       const aggPubkeys = [
         bls.aggregatePubkeys([pks[0], pks[1]].map((pk) => pk.toBytes())),
@@ -74,7 +69,7 @@ export function runIndexTests(bls: IBls): void {
       const msg = randomMessage();
       const sks = getN(n, () => bls.PrivateKey.fromKeygen());
       const pks = sks.map((sk) => sk.toPublicKey());
-      const sigs = sks.map((sk) => sk.signMessage(msg));
+      const sigs = sks.map((sk) => sk.sign(msg));
 
       const aggregateSignature = bls.aggregateSignatures(sigs.map((sig) => sig.toBytes()));
 
diff --git a/test/unit/run-web-implementation.test.ts b/test/unit/run-web-implementation.test.ts
index b70e9bd..159c0f2 100644
--- a/test/unit/run-web-implementation.test.ts
+++ b/test/unit/run-web-implementation.test.ts
@@ -11,7 +11,7 @@ describe("herumi", () => {
   before(async () => {
     // For consistency with describeForAllImplementations
     // eslint-disable-next-line import/no-named-as-default-member
-    await herumi.initBLS();
+    await herumi.init();
   });
 
   runPrivateKeyTests(herumi);
diff --git a/test/util.ts b/test/util.ts
index e25f4b5..1ae5cc0 100644
--- a/test/util.ts
+++ b/test/util.ts
@@ -1,7 +1,7 @@
 import crypto from "crypto";
 
-export function fromHexString(hex: string): Buffer {
-  return Buffer.from(hex.replace("0x", ""), "hex");
+export function fromHexString(hex: string): Uint8Array {
+  return Uint8Array.from(Buffer.from(hex.replace("0x", ""), "hex"));
 }
 
 export function toHexString(bytes: Buffer | Uint8Array): string {