Javascript Bindings — js-bitcoinkernel¶

js-bitcoinkernel is experimental. Do not use it for consensus-critical applications, mainnet funds, custody, wallets, or systems where an incorrect validation result could cause financial loss. !!!

What This Library Does¶

js-bitcoinkernel is a TypeScript wrapper around Bitcoin Core's libbitcoinkernel. It lets JavaScript programs load the native kernel library and work with Bitcoin consensus objects without directly handling C pointers.

At a high level, the package gives you:

• Binary parsers for block headers, blocks, transactions, script pubkeys, transaction outputs, and hashes.
• Safe object wrappers around opaque native handles.
• Context-free block validation with Block.check(...).
• Full block and header processing through ChainstateManager.
• Script verification for legacy, SegWit, and Taproot-aware flows.
• Logging and validation callbacks from the native kernel.

How The Pieces Fit¶

First Taste¶

import {
  BlockHeader,
  ChainParameters,
  ChainType,
} from "js-bitcoinkernel";

const headerHex =
  "010000006fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000982051fd1e4ba744bbbe680e1fee14677ba1a3c3540bf7b1cdb606e857233e0e61bc6649ffff001d01e36299";

const header = BlockHeader.fromBytes(Buffer.from(headerHex, "hex"));
const params = new ChainParameters(ChainType.MAINNET);

console.log(header.blockHash.toString());
console.log(params.consensusParams.toString());

Start with the Introduction, review the Repository Analysis if you want the source-level map, then move into the Quick Start and API Overview.