def generate_keypair
import bend-collections@1.0.0.0/src/crypto/sign.bend as Signimport Base
import bend-collections@1.0.0.0/src/crypto/curve25519/x25519.bend as X
30def generate_keypair(+seed: List<&2, U32>) -> Maybe<&2, Keypair>:
31 keypair_if(seed, X.valid_bytes(32n, seed))