According to Woofun AI, the crypto research team Alloc Init has officially unveiled a "Shielded Bitcoin" proposal aimed at delivering Zcash-style private transactions for the Bitcoin network without triggering a soft fork. The plan seeks to restructure the transaction privacy layer through technical means while keeping the underlying protocol consensus mechanism unchanged, offering Bitcoin users—long constrained by the transparent ledger—a new path that balances compliance and privacy, and marking the latest attempt to apply zero-knowledge proof technology to a mainstream public chain through a sidechain-like approach.
Clara Shikhelman, Mikhail Komarov, and Alexei Moskvin jointly released the technical blueprint on Thursday. The core architecture abandons the traditional idea of having miners execute a privacy protocol, instead treating Bitcoin as a neutral publication and ordering layer. Under this framework, specialized indexer software takes on key responsibilities: verifying zero-knowledge proofs, confirming that funds have not been double-spent, and reconstructing the state of the privacy system.
Woofun AI's compiled data shows that the design draws heavily on Zcash logic, employing encrypted notes, a public nullifier mechanism to mark note consumption, and zero-knowledge proofs to ensure transaction validity. Notably, "Shielded Bitcoin" does not build an independent blockchain or consensus mechanism, relying entirely on existing infrastructure for state synchronization and verification. However, the effectiveness of privacy protection is tightly linked to the size of the user base, and this structural flaw has drawn harsh scrutiny from industry experts.
Developer Vadim Zavodir pointed out on the X platform that privacy depends on the scale of the user group. Zcash took years to build an effective anonymity set, while the new system starts from zero and could initially even find itself in a one-person crowd. The researchers also acknowledged in a companion article that large deposits do not automatically translate into high anonymity; if a small number of users dominate encrypted note creation, or specific wallets exhibit unusual behavioral patterns, observers can still untangle transaction links through on-chain analysis.
On the security dimension, Pierre-Luc Dallaire-Demers, founder of Pauli Group, offered sharp criticism, arguing that the proposal has no quantum-resistant capability whatsoever. Although he is exploring an alternative version based on post-quantum signature schemes, the current architecture appears extremely vulnerable to the threat of quantum computing.
By contrast, Eli Ben-Sasson, co-founder of Zerocash and CEO of StarkWare, expressed support. He noted that the original intent of the Zerocash paper was to bring privacy to Bitcoin, and although he has not yet read the new paper in detail, he looks forward to seeing the vision of achieving privacy and scalability through zero-knowledge proofs come true.