[alloc] init unveils Shielded Bitcoin for Zcash-style privacy without protocol forks

New York-based cryptography firm [alloc] init has introduced what it calls “Shielded Bitcoin,” a metaprotocol designed to bring Zcash-grade transaction privacy to Bitcoin’s base layer without changing a single line of Bitcoin’s consensus code. The system uses encrypted notes, nullifiers, and zero-knowledge proofs, all published directly on the Bitcoin blockchain, to create shielded transfers that look like ordinary Schnorr signature transactions on-chain. How PIPEs v2 makes it work The technical foundation is something the team calls Bitcoin PIPEs v2, detailed in a paper published on February 5, 2026, by a 10-member research team. PIPEs v2 introduces witness encryption to Bitcoin, a cryptographic technique that locks private keys behind what mathematicians call non-deterministic polynomial (NP) statements. In simpler terms, it creates spending conditions that are enforced by pure math rather than by Bitcoin’s scripting language or its consensus rules. The specific mechanism uses something called an Arithmetic Affine Determinant Program (AADP)-based witness encryption scheme. AADP is a mathematical framework that allows the system to verify complex conditions about transactions with...