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import config from "$config";
import { HDKey } from "@scure/bip32";
import { p2wpkh, NETWORK, TEST_NETWORK } from "@scure/btc-signer";
const { esploraUrl } = config.bitcoin;
const REGTEST_NETWORK = {
bech32: "bcrt",
pubKeyHash: 0x6f,
scriptHash: 0xc4,
wif: 0xef,
};
const REGTEST_VERSIONS = { private: 0x04358394, public: 0x043587cf };
const btcNetwork =
config.bitcoin.network === "regtest"
? REGTEST_NETWORK
: config.bitcoin.network === "testnet"
? TEST_NETWORK
: NETWORK;
const hdVersions =
config.bitcoin.network === "regtest" || config.bitcoin.network === "testnet"
? REGTEST_VERSIONS
: undefined;
// Esplora API
export const getUtxos = async (address: string) => {
const r = await fetch(`${esploraUrl}/address/${address}/utxo`);
if (!r.ok) throw new Error(`esplora getUtxos: ${r.status}`);
return r.json();
};
export const getAddressUtxos = async (addresses: string[]) => {
const results = [];
for (const address of addresses) {
const utxos = await getUtxos(address);
for (const u of utxos as any) {
u.address = address;
results.push(u);
}
}
return results;
};
export const broadcastTx = async (txHex: string) => {
const r = await fetch(`${esploraUrl}/tx`, {
method: "POST",
body: txHex,
headers: { "Content-Type": "text/plain" },
});
if (!r.ok) {
const body = await r.text();
throw new Error(`broadcast failed: ${body}`);
}
return r.text();
};
export const getTxStatus = async (txid: string) => {
const r = await fetch(`${esploraUrl}/tx/${txid}/status`);
if (!r.ok) throw new Error(`esplora getTxStatus: ${r.status}`);
return r.json();
};
export const getFeeEstimates = async () => {
const r = await fetch(`${esploraUrl}/fee-estimates`);
if (!r.ok) throw new Error(`esplora getFeeEstimates: ${r.status}`);
return r.json();
};
export const getTx = async (txid: string) => {
const r = await fetch(`${esploraUrl}/tx/${txid}`);
if (!r.ok) throw new Error(`esplora getTx: ${r.status}`);
return r.json();
};
export const getAddressTxs = async (address: string) => {
const r = await fetch(`${esploraUrl}/address/${address}/txs`);
if (!r.ok) throw new Error(`esplora getAddressTxs: ${r.status}`);
return r.json();
};
export const getTxHex = async (txid: string) => {
const r = await fetch(`${esploraUrl}/tx/${txid}/hex`);
if (!r.ok) throw new Error(`esplora getTxHex: ${r.status}`);
return r.text();
};
// Address derivation
const hdVersionsForKey = (pubkey: string) => {
if (pubkey.startsWith("tpub") || pubkey.startsWith("tprv")) return REGTEST_VERSIONS;
// xpub/xprv use default BITCOIN_VERSIONS (mainnet) — pass undefined
return undefined;
};
export const deriveAddress = (
pubkey: string,
_fingerprint: string,
index: number,
internal = false,
) => {
const accountKey = HDKey.fromExtendedKey(pubkey, hdVersionsForKey(pubkey));
const chain = internal ? 1 : 0;
const child = accountKey.deriveChild(chain).deriveChild(index);
const { address } = p2wpkh(child.publicKey, btcNetwork);
const path = `m/${chain}/${index}`;
return { address, path };
};
export const deriveAddresses = (
pubkey: string,
fingerprint: string,
count: number,
internal = false,
) => {
const addresses = [];
for (let i = 0; i < count; i++) {
const { address } = deriveAddress(pubkey, fingerprint, i, internal);
addresses.push(address);
}
return addresses;
};
// Migration helpers
export const parseDescriptor = (desc: string) => {
// Parse wpkh([fingerprint]pubkey/0/*)#checksum
const match = desc.match(/wpkh\(\[([a-f0-9]+)\]([^/]+)\/\d+\/\*\)/);
if (!match) return null;
return { fingerprint: match[1], pubkey: match[2] };
};
export const findLastUsedIndex = async (pubkey: string, fingerprint: string, maxScan = 100) => {
let lastUsed = -1;
for (let i = 0; i < maxScan; i++) {
const { address } = deriveAddress(pubkey, fingerprint, i, false);
const txs = await getAddressTxs(address);
if ((txs as any).length > 0) lastUsed = i;
}
return lastUsed + 1;
};
export { btcNetwork, hdVersions };
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