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

The proposal separates spending and viewing rights, allowing users to share transaction details without exposing spending authority. Researchers behind Alloc Init have proposed “Shielded Bitcoin,” a metaprotocol designed to hide BTC transfer amounts and counterparties without changing Bitcoin’s consensus rules or relying on trusted bridge operators. The design borrows the encrypted-note approach Zcash made known, but builds it directly on Bitcoin’s existing base layer, using cryptographic proofs instead of a trusted intermediary to move value privately. How the Privacy Layer Works Presented by Clara Shikhelman, Mikhail Komarov and Aleksei Moskvin, the proposal starts with a simple limitation: Bitcoin’s ledger is public, so amounts, transaction timing and links between transactions can often be examined and associated with known wallets. Shielded Bitcoin would place value into encrypted “notes,” with each note containing an amount and its owner’s receiving information. So, for example, when Alice pays Bob, her wallet would publish encrypted notes to Bitcoin alongside a zero-knowledge proof. The proof confirms that the notes being spent exist and that Alice is authorized to spend the...