Bitcoin & crypto
P2PK
Pay to Public Key
The earliest Bitcoin output type, which places the raw public key directly in the script. P2PK outputs expose their public key from the moment they are funded, making them the most quantum-exposed coins on the network.
In practice
Most early Satoshi-era mining rewards are P2PK outputs that have never moved.
Related terms
P2PKH
The legacy Bitcoin address type beginning with 1, which locks funds to the hash of a public key rather than the key itself. An unspent P2PKH output does not reveal its public key.
Public-key exposure
Whether an address's full public key is visible on-chain. Exposure matters because quantum risk to a wallet begins only once the public key is published — before that, an attacker sees just a hash.