New Shielded Bitcoin Proposal Could Enable Private Transfers Without

Shielded Bitcoin proposal enables private transfers by hiding transaction amounts,

A new research proposal called Shielded Bitcoin outlines a way to enable private Bitcoin transfers without changing Bitcoin's consensus rules through a soft fork. The design would conceal transaction amounts, senders and recipients while using zero-knowledge proofs to allow transfers to remain independently verifiable.

Coin Bureau highlighted the proposal in a post on X, citing the newly published Shielded Bitcoin paper. The protocol was proposed by cryptography researchers Clara Shikhelman, Mikhail Komarov and Aleksei Moskvin and is designed as a metaprotocol operating on Bitcoin's existing base layer.

How Shielded Bitcoin Would Work

The proposal uses encrypted notes to represent shielded value. Rather than publishing the amount and ownership information of a transfer in readable form, users would publish encrypted transfer data alongside a zero-knowledge proof.

The proof would allow software operating the protocol to verify that a transaction is valid without revealing the underlying transaction details. Bitcoin itself would serve primarily as a public publication and ordering layer, while separate indexers would process the published data and reconstruct the state of the shielded system.

The design also uses nullifiers to prevent the same shielded notes from being spent more than once. The researchers describe the architecture as drawing on concepts used by Zcash, including encrypted notes and zero-knowledge proofs, but without creating a separate blockchain or changing Bitcoin's consensus mechanism.

Privacy Without Making Bitcoin Transactions Invisible

The proposal addresses a longstanding characteristic of Bitcoin: transactions recorded directly on its blockchain are publicly observable. Amounts, transaction timing and links between addresses can be analyzed, and known wallet addresses can sometimes be associated with individuals or organizations.

Shielded Bitcoin would change what is publicly visible for transfers conducted inside the proposed system. According to the project's technical description, observers would be able to see that a shielded transfer occurred and when it was published, as well as information about the Bitcoin transaction carrying the data. They would not see the shielded amount, the recipient or which earlier shielded notes were spent.

The proposal also includes selective-disclosure capabilities. Users could derive separate read-only keys that allow them to disclose transaction information to third parties without giving those parties the ability to spend the funds. That feature is intended to support situations such as accounting, auditing or selectively proving a particular payment.

Proposal Still Represents a New Protocol Layer

Shielded Bitcoin is not a change to Bitcoin's existing consensus rules. Instead, it would operate as an additional protocol layer that interprets data published to the Bitcoin blockchain.

The researchers say the system is intended to avoid trusted operators holding users' funds. Spending authority remains with users, while indexers can verify and reconstruct the protocol's state but cannot spend users' shielded notes.

The proposal therefore differs from Zcash in its relationship with the underlying blockchain. Zcash uses its own blockchain and consensus rules, while Shielded Bitcoin is designed to derive its state from Bitcoin's existing transaction history.

The researchers' companion work on moving Bitcoin into and out of the shielded system is expected to address the mechanisms for entering and exiting the protocol, an important part of how the proposed architecture would function in practice.

Writer: Victoria Hale
Technology & Blockchain Writer

Victoria Hale writes about blockchain technology, digital infrastructure, and the intersection of emerging technologies with finance. Her articles explore how new protocols and systems are shaping the evolving digital economy.

She prioritises clarity and accuracy when explaining technical developments to a general audience.