CompressedPublicKey

33-byte compressed secp256k1 public key

33-byte compressed secp256k1 public key with validated prefix byte.

Definition

class CompressedPublicKey(_SizedHexBytes):
    _size = 33

Construction

Parameter	Type	Required	Description
val	bytes | str | int	Yes	Hex string, raw bytes, or integer

Raises ValueError if:

• Length is not exactly 33 bytes

• First byte is not 0x02 or 0x03

Example

from eth_keys import keys as eth_keys
from seismic_web3 import PrivateKey, CompressedPublicKey
import os

private_key = PrivateKey(os.urandom(32))
sk = eth_keys.PrivateKey(bytes(private_key))
pubkey = CompressedPublicKey(sk.public_key.to_compressed_bytes())

Compressed format

Seismic uses compressed public keys exclusively:

• 1-byte prefix (0x02 for even y, 0x03 for odd y) + 32-byte x-coordinate

• 33 bytes total, versus 65 bytes for uncompressed keys

See Also

• PrivateKey — corresponding private key type

• SeismicElements — uses CompressedPublicKey for encryption_pubkey

• ecdh — ECDH key derivation with public keys