TLDR
- Researchers led by Clara Shikheman proposed a method for private Bitcoin transfers that does not require changes to Bitcoin’s consensus rules.
- The method borrows mixer logic similar to Tornado Cash combined with zero-knowledge proofs to hide sender, receiver, and transaction amount.
- Eli Ben-Sasson, founder of Starknet, publicly supported the idea, tying it back to the original Zerocash paper that led to Zcash.
- Researcher Robin Linus warned the cryptography behind the proposal is experimental and its security assumptions are not yet established.
- Some critics also note the approach may not be secure against quantum computing threats.
A group of researchers has proposed a new way to add private transactions to Bitcoin without altering the network’s underlying consensus rules. The team is led by Clara Shikheman, who heads the Bitcoin research firm Alloc Init.
The "Shielded Bitcoin" paper is a great step forward. More privacy on Bitcoin is good for everyone.
Fun fact: Zerocoin, the paper behind Zcash, was first proposed for Bitcoin in 2013. The Bitcoin community passed on it, as zero-knowledge proofs were still immature.
But the…
— Cypherpunk (@cypherpunk) September 24, 2026
The idea centers on hiding the sender, receiver, and amount involved in a Bitcoin transfer. It does this using mixer logic similar to what Tornado Cash used, paired with zero-knowledge proofs.
How The Proposed System Would Work
Under the proposal, a person could place their Bitcoin into an encrypted note. That note can then move using zero-knowledge proofs, which keep transaction details hidden from public view.
When the funds exit the system, the user receives a new address. This breaks the visible link between the original wallet and the final destination.
Shikheman described the plan as requiring no soft forks, no bridges, and no outside operators. She said the team focused heavily on studying what information the protocol could still reveal, even while shielding transactions.
She also said the current release represents an early stage of the project, with more development expected.
Eli Ben-Sasson, founder of Starknet and one of the original authors behind zero-knowledge proof research, spoke in favor of the plan. He referenced the Zerocash paper, which came before Zcash was created, saying its original goal was to bring privacy features to Bitcoin.
Ben-Sasson said he would like to see that original vision of privacy and scalability appear on the Bitcoin base layer itself.
Why Privacy Matters For Blockchain Users
Public blockchains are open ledgers by design. Anyone with an internet connection can view wallet balances and track transaction history.
This lack of privacy has pushed some Bitcoin holders toward Zcash in the past, since it offers shielded transaction pools. Not everyone who wants privacy has bad intentions.
A simple purchase, like buying a cup of coffee, can expose a person’s full financial history if that transaction is fully traceable. Critics of transparent blockchains argue this creates unnecessary personal and physical safety risks.
Reports of kidnappings and physical attacks tied to crypto holders have increased in recent years. Some of these cases have been linked to data exposed through blockchain transaction tracking.
Supporters of the new proposal argue that adding privacy features could reduce these risks for everyday Bitcoin users.
Not everyone is convinced the method is ready for real-world use. Researcher Robin Linus said the cryptography behind the approach remains experimental.
Linus said the security assumptions underlying the system are still far from being fully tested or proven. He did not dismiss the idea outright, but urged caution before treating it as reliable.
Other critics have raised concerns that the method may not hold up against future quantum computing capabilities. This is a common concern raised about many current cryptographic systems.
Despite the criticism, the proposal has sparked renewed conversation about privacy on the Bitcoin network. Whether it becomes widely adopted will depend on further testing and review from the wider Bitcoin research community.
As of now, the project remains in its early research phase, with its developers describing this release as just a starting point.
