@arklabs/wallet-sdk/dist/esm/script/address.js

Bitcoin wallet SDK with Taproot and Ark integration

import { bech32m } from "@scure/base";
import { Script } from "@scure/btc-signer";
// ArkAddress is a bech32m encoded address with a custom HRP (ark/tark)
export class ArkAddress {
    constructor(serverPubKey, tweakedPubKey, hrp) {
        this.serverPubKey = serverPubKey;
        this.tweakedPubKey = tweakedPubKey;
        this.hrp = hrp;
        if (serverPubKey.length !== 32) {
            throw new Error("Invalid server public key length");
        }
        if (tweakedPubKey.length !== 32) {
            throw new Error("Invalid tweaked public key length");
        }
    }
    static decode(address) {
        const decoded = bech32m.decodeUnsafe(address, 1023);
        if (!decoded) {
            throw new Error("Invalid address");
        }
        const data = new Uint8Array(bech32m.fromWords(decoded.words));
        // First 32 bytes are server pubkey, next 32 bytes are tweaked pubkey
        if (data.length !== 64) {
            throw new Error("Invalid data length");
        }
        const serverPubKey = data.slice(0, 32);
        const tweakedPubKey = data.slice(32, 64);
        return new ArkAddress(serverPubKey, tweakedPubKey, decoded.prefix);
    }
    encode() {
        // Combine server pubkey and tweaked pubkey
        const data = new Uint8Array(64);
        data.set(this.serverPubKey, 0);
        data.set(this.tweakedPubKey, 32);
        const words = bech32m.toWords(data);
        return bech32m.encode(this.hrp, words, 1023);
    }
    get pkScript() {
        return Script.encode(["OP_1", this.tweakedPubKey]);
    }
}