@ensdomains/address-encoder

A cryptocurrency address encoder/decoder in TypeScript

Text-format addresses are decoded into their native binary representations, and vice-versa. In the case of Bitcoin-derived chains, this means their scriptPubKey; for Ethereum-derived chains this is their hash.

This library was written for use with EIP 2304, but may be useful for anyone looking for a general purpose cryptocurrency address codec.

EVM compatible chains are either specified using SLIP44 coinType or 0x80000000 | chainId where 0x80000000 is msb (most significant bit) reserved at SLIP44 and no coin types exist in that range. This is to avoid number colision with th existing coin types.

Please read the specification page for the more detail

Installation

bun add @ensdomains/address-encoder

Getting Started

// Import coder getter
import { getCoderByCoinName } from "@ensdomains/address-encoder";

// Get the coder for the address you want to encode/decode
const btcCoder = getCoderByCoinName("btc");

// Decode the address
const decodedAddress = btcCoder.decode("1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa");
// Uint8Array(25) [ 118, 169, 20, 98, 233, 7, 177, 92, 191, 39, 213, 66, 83, 153, 235, 246, 240, 251, 80, 235, 184, 143, 24, 136, 172 ]

// Encode the address
const encodedAddress = btcCoder.encode(decodedAddress);
// 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa

Hex String Encoding

If the data you are encoding is a hex string rather than Uint8Array, you can use hexToBytes() from @noble/hashes to convert it to the correct type. It expects the hex string without the 0x prefix.

import { getCoderByCoinName } from "@ensdomains/address-encoder";
import { hexToBytes } from "@noble/hashes/utils.js";

const btcCoder = getCoderByCoinName("btc");

// Convert hex encoded data to bytes
const dataAsBytes = hexToBytes(
  "76a91462e907b15cbf27d5425399ebf6f0fb50ebb88f1888ac"
);
// Uint8Array(25) [ 118, 169, 20, 98, 233, 7, 177, 92, 191, 39, 213, 66, 83, 153, 235, 246, 240, 251, 80, 235, 184, 143, 24, 136, 172 ]

// Pass bytes to encoder
const encodedAddress = btcCoder.encode(dataAsBytes);
// 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa

Supported Cryptocurrencies

To view all the supported cryptocurrencies of this library, see here.

Additional Functionality

Async Coder Getter

import { getCoderByCoinNameAsync } from "@ensdomains/address-encoder/async";

const btcCoder = await getCoderByCoinNameAsync("btc");

Individual Coin Imports

import { btc } from "@ensdomains/address-encoder/coins";

const decodedAddress = btc.decode("1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa");
const encodedAddress = btc.encode(decodedAddress);

Individual Coder Function Imports

import {
  decodeBtcAddress,
  encodeBtcAddress,
} from "@ensdomains/address-encoder/coders";

const decodedAddress = decodeBtcAddress("1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa");
const encodedAddress = encodeBtcAddress(decodedAddress);

EVM Chains

There are a variety of EVM chains supported, however none of them (except for ETH) are exported from coins or coders. If you want to individually import for an EVM chain, you can just use the eth import as a replacement.

Contribution Guide

To add a coin to this library, or if you're interested in contributing in any other way, read the contribution guide before submitting a PR.