@spec xonly_pubkey(Secp256k1.seckey()) :: Secp256k1.xonly_pubkey()

Derive xonly pubkey from seckey

Examples

iex> {seckey, _} = Secp256k1.keypair(:compressed)
iex> xonly = Secp256k1.Extrakeys.xonly_pubkey(seckey)
iex> byte_size(xonly)
32