Researchers Unveil ZCash-Style Privacy Design for Bitcoin

Researchers at alloc init have published a design for private Bitcoin transfers that would hide the sender, recipient, and amount of a payment while running on the existing Bitcoin network.

The 56-page paper, dated September 24, 2026, is written by Clara Shikhelman, Mikhail Komarov, and Aleksei Moskvin. They have 'put a lot of work into thinking carefully about the security of Shielded Bitcoin and about what information the protocol reveals,' according to Clara Shikhelman.

The team has called it 'ZCash-style privacy on the Bitcoin L1 via PIPEs v2.' This design, known as Shielded Bitcoin, uses encrypted 'notes' to hold value and each transfer carries a zero-knowledge proof that the sender controls the notes being spent. A public marker called a nullifier lets software reject double spends without revealing which note was used.

The authors contrast this with Shielded CSV, a 2025 Bitcoin proposal in which coin owners must keep their own transaction data, generally cannot be recovered from the chain.