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

Bitcoin wallet SDK with Taproot and Ark integration

import { Address, p2tr, TAP_LEAF_VERSION, taprootListToTree, } from "@scure/btc-signer/payment";
import { TAPROOT_UNSPENDABLE_KEY, } from "@scure/btc-signer/utils";
import { ArkAddress } from './address.js';
import { Script } from "@scure/btc-signer";
import { hex } from "@scure/base";
export function scriptFromTapLeafScript(leaf) {
    return leaf[1].subarray(0, leaf[1].length - 1); // remove the version byte
}
export class VtxoScript {
    static decode(scripts) {
        return new VtxoScript(scripts.map(hex.decode));
    }
    constructor(scripts) {
        this.scripts = scripts;
        const tapTree = taprootListToTree(scripts.map((script) => ({ script, leafVersion: TAP_LEAF_VERSION })));
        const payment = p2tr(TAPROOT_UNSPENDABLE_KEY, tapTree, undefined, true);
        if (!payment.tapLeafScript ||
            payment.tapLeafScript.length !== scripts.length) {
            throw new Error("invalid scripts");
        }
        this.leaves = payment.tapLeafScript;
        this.tweakedPublicKey = payment.tweakedPubkey;
    }
    encode() {
        return this.scripts.map(hex.encode);
    }
    address(prefix, serverPubKey) {
        return new ArkAddress(serverPubKey, this.tweakedPublicKey, prefix);
    }
    get pkScript() {
        return Script.encode(["OP_1", this.tweakedPublicKey]);
    }
    onchainAddress(network) {
        return Address(network).encode({
            type: "tr",
            pubkey: this.tweakedPublicKey,
        });
    }
    findLeaf(scriptHex) {
        const leaf = this.leaves.find((leaf) => hex.encode(scriptFromTapLeafScript(leaf)) === scriptHex);
        if (!leaf) {
            throw new Error(`leaf '${scriptHex}' not found`);
        }
        return leaf;
    }
}