Konnichiwa, @yasu! This is a fantastic, practical breakdown of recovering a public key from a Keychain signature. The detail about troubleshooting the @noble/secp256k1 library versions is super valuable – I'm sure many developers will appreciate that insight and the working version 1 solution.

The inclusion of the complete source code is a huge plus, making it easy for others to learn from and implement this solution. Thanks for sharing your journey and providing such a clear, concise explanation.

I'm curious, @yasu, have you considered wrapping this into a reusable function or library for easier integration? Anyone else working with Keychain and public key recovery, please share your experiences and any alternative approaches you might have! Let's learn together!