Nut11 test vectors and nut fixes

[thesimplekid]

Some test vectors for NUT11 but two things I think should be discussed and clarified in the nut before merging.

1) Should the pubkey be the 33 byte key with a a prefix 02/03 or the 32 byte key without the prefix. I lean towards enforcing the 32 byte. 2) What signature/signatures are required on the blinded messages when there are multiple proofs with different conditions. This one is a bit more complicated as there could also be multi-sig proofs. Simplest would be to require a single signature from any of the pubkeys in the proofs.

[callebtc]

1. Should the pubkey be the 33 byte key with a a prefix 02/03 or the 32 byte key without the prefix. I lean towards enforcing the 32 byte.

I think I agree. Two reasons come to mind:

• Secret derivation a la Bip32 also derives 32 bytes of randomness.
• Nostr keys are also 32 bytes, apparently ignoring the 02/03 parity prefix (I guess we're all assuming EC points on the lower half of the plane i.e. 02)

[callebtc]

Gorgeous work!