Researchers Propose Shielded Bitcoin for Zcash-Style Privacy Without a Soft Fork

Key Takeaways

• Researchers at Alloc Init have published a specification for Shielded Bitcoin that would conceal transfer amounts and participants without changing Bitcoin’s consensus rules.
• The design draws on Zcash’s encrypted-note architecture and zero-knowledge proofs.
• The published research excludes the mechanisms for depositing and withdrawing Bitcoin.

Researchers at Bitcoin cryptography developer Alloc Init have published a proposal called Shielded Bitcoin, designed to enable Zcash-style private transfers without changing Bitcoin’s consensus rules.

The September 24, 2026, paper, by Clara Shikhelman, Mikhail Komarov, and Aleksei Moskvin, describes a system designed to conceal transfer amounts and participants. However, it leaves the mechanism for moving Bitcoin into and out of the system to separate research.

— allocinit (@allocinitxyz) Sep 24, 2026

“No soft forks, no bridges,  no operators, just Bitcoin. We’ve put a lot of work into thinking carefully about the security of Shielded Bitcoin and about what information the protocol reveals. And this is just the beginning,” said Clara Shikhelman.

Komarov called it “ZCash-style privacy on the Bitcoin L1 via PIPEs v2.”

How Shielded Bitcoin Would Work

The design represents value as encrypted records called notes. Users would publish notes alongside zero-knowledge proofs that show a transfer follows the rules without publicly revealing its private details.

A public marker called a nullifier would let software reject double spends without revealing which note was used. The proofs would establish that senders are authorized to spend and transfers do not create extra value.

Shielded Bitcoin would publish encrypted transfer data on Bitcoin, which records and orders the transaction data. Separate software programs called indexers would verify the proofs and reconstruct the system’s state from Bitcoin’s history. Miners would not enforce its privacy rules.

Unlike Zcash, Shielded Bitcoin would use Bitcoin’s existing blockchain, with separate software validating its transfer rules.

Privacy Has Limits

The proposal covers only transfers inside the system. It would still expose transaction timing, fees, data size, and the number of notes involved. A recognizable wallet paying publication fees could also reveal who submitted a transfer.

The proposed reference design uses the Groth16 proof system that requires a trusted setup ceremony with at least one honest participant.

The researchers warn that concentrated activity or distinctive wallet behavior could help observers infer relationships between payments. Encrypting transfer contents would therefore not eliminate every route to identification.

Bitcoin Entry and Exit Await Separate Specification

The researchers say a companion paper will detail how Bitcoin enters and leaves the system using Bitcoin PIPEs v2.

The published paper limits its noncustodial claim to transfers within the shielded system.

The current paper’s noncustodial claim covers transfers within the shielded system; deposits and withdrawals require separate security analysis.

Get started on WEEX with a simple 40 USDT reward. Deposit 100 USDT, make your trade, and claim the bonus. 

Disclaimer: All content on The Moon Show is for informational and educational purposes only. The opinions expressed do not constitute financial advice or recommendations to buy, sell, or trade cryptocurrencies. Trading involves significant risk and may result in substantial losses. Always seek independent financial advice before making investment decisions. The Moon Show is not responsible for any financial losses or decisions made based on the information provided.

Please view the full disclaimer at: https://themoonshow.com/disclaimer