Hi HN – I've been working on a Bitcoin/Bitcoin Cash library written in TypeScript, and I just released the first production\-ready feature: a WebAssembly version of Secp256k1, the digital signature and verification system used by most cryptocurrencies. You can find more details and benchmarks at the link. If you're interested, please watch/star the [`bitcoin-ts` project on GitHub](
https://github.com/bitjson/bitcoin-ts). I'm also happy to answer questions here. Thanks!