Counterparty's Fake-Pubkey Grinding Exposes Bitcoin Consensus vs. Policy Boundary

Counterparty's 2014 protocol embedded data in Bitcoin by encoding payloads inside fake public keys in multisig outputs. These fake keys must be valid secp256k1 points to pass consensus checks, even if never spent. The technique reveals a key distinction between Bitcoin's consensus layer (what's possible) and policy layer (what's allowed).