Shielded Bitcoin Aims to Bring Zcash-Style Privacy to Bitcoin Without Changing Its Rules
Researchers have proposed a way to make Bitcoin transactions more private without altering its underlying rules. This approach, known as Shielded Bitcoin, draws inspiration from Zcash's encrypted payment design.
In the proposed system, bitcoin-denominated value would be held in encrypted records called notes. These notes could then be spent using special markers that publish a proof of ownership and mathematical verification that new funds were not created.
Unlike Zcash, which relies on its own blockchain to validate these proofs, Shielded Bitcoin would publish the transfer data on Bitcoin's public ledger while relying on separate software to verify the encrypted transactions. This means that a Bitcoin transaction could be confirmed while the private payment recorded inside it failed Shielded Bitcoin's checks.
The proposal has garnered attention from Zcash proponents and critics alike. Some have welcomed the research, citing the need for more privacy in cryptocurrencies as they seek to become viable alternatives for everyday spending and payroll. Others have raised concerns about the system's limitations, including its reliance on a trusted setup and lack of fee anonymization.