TIL the https://github.com/btcsuite/btcd imports from Decred:

https://github.com/btcsuite/btcd/blob/master/btcec/schnorr/signature_test.go#L17

I am in the process of refactoring the Decred secp256k1 to use SHA256 hashes for the signature and adding BIP340 tests for the Schnorr signatures. The SHA256 library will be one that uses AVX2 SIMD - which is substantially faster than the SHA256 code used in btcd/lnd.

This will be a clean, dependency free package for Golang bitcoin/lightning/nostr developers that will save everyone from the go modules hell of btcd.