We just released v0.3.0 of bitcoin-s.

Bitcoin-s is a loosely coupled set of cryptocurrency libraries for the JVM. They work well together, but also can be used independently. This project's goal is NOT to be a full node implementation, rather a set of scalable cryptocurrency libraries that use industry standard tools (rather than esoteric tech often found in cryptocurrency) where possible to make the lives of professional software engineers, security engineers, devops engineers and accountants easier. We are rapidly iterating on development with the goal of getting to a set of stable APIs that only change when the underlying bitcoin protocol changes.

Here is an interactive code editor that allows you to play around with basic data structures in bitcoin-s like private keys, psbts, and block filters:

You can find more examples of how our neutrino node, wallet, bitcoind rpc client and secp256k1jni (bindings for libsecp256k1) work on our website:

https://bitcoin-s.org/docs/next/getting-setup

https://github.com/bitcoin-s/bitcoin-s/releases/tag/v0.3.0