Just open sourced libnostr-c, a pure C implementation of Nostr that's 53x faster than JS libs and runs on embedded hardware.
Built this so you can add Nostr to Bitcoin nodes and hardware wallets without needing Node.js.
Feedback/contributions welcome!
https://github.com/privkeyio/libnostr-c
https://privkey.substack.com/p/why-nostr-needs-a-c-library-lessons