But the signature is an encrypted hash value, which is decrypted when verifying the signature. Maybe you could say signature verification as a concept is not en

But the signature is an encrypted hash value, which is decrypted when verifying the signature. Maybe you could say signature verification as a concept is not encryption, but certainly Bitcoin's implementation uses encryption, and I don't think there's any definition of 'asymmetric cryptography' that is not also some form of encryption.