import nacl.signing
import nacl.encoding
import base58


class Signer:
    def __init__(self, seed: bytes):
        if len(seed) != 32:
            raise ValueError("Seed must be 32 bytes")
        self.signing_key = nacl.signing.SigningKey(seed)
        self.verify_key = self.signing_key.verify_key

    def sign(self, data_bytes: bytes) -> str:
        signed_message = self.signing_key.sign(data_bytes)
        signature = signed_message.signature
        return base58.b58encode(signature).decode()

    def verify(self, data_bytes: bytes, signature: str) -> bool:
        signature_bytes = base58.b58decode(signature)
        try:
            self.verify_key.verify(data_bytes, signature_bytes)
            return True
        except nacl.exceptions.BadSignatureError:
            return False