Researchers Propose ZK-Proofs for Bitcoin Privacy Without a Soft Fork

Cryptography firm Alloc Init published a paper proposing "Shielded Bitcoin," a method to conceal transaction amounts and sender details without requiring consensus changes. The architecture avoids a soft fork by treating the Bitcoin blockchain purely as a neutral ordering layer, pushing the verification of zero-knowledge proofs to separate external indexers. Developer Vadim Zavodil noted that starting a new metaprotocol means the initial anonymity set is zero, stripping away actual privacy protections until massive adoption occurs. Pauli Group founder Pierre-Luc Dallaire-Demers added that the proposed construction is currently entirely vulnerable to future quantum computing attacks. "Privacy is a function of the crowd. Zcash has a real shielded pool built over years. A brand new metaprotocol starts at zero, so your first private transfer hides in a crowd of one." — Vadim Zavodil