Zcash developers merge the first Tachyon component into the shared Zakura library

Zcash developers released Udon, a component of the proposed Tachyon upgrade, into Zakura Common, the shared cryptography library used by the Zakura node software and other Zcash projects. Project Tachyon lead Sean Bowe confirmed the merge on Monday, CoinDesk reported. Earlier work on the same library cut the time to create a private transaction from more than three seconds to under 200 milliseconds in some tests.

Tachyon's purpose is to reduce the data a node must download and verify as shielded usage grows, by aggregating proofs from many transactions into one. The stated long-term target is more than 50,000 private payments a second, per coverage of the release. That figure is a design goal, not a measured throughput. Tachyon has not been activated on the Zcash mainnet, and the remaining path runs through further development and security audits.

This design choice matters because of what it changes. Shielded systems historically forced each node to carry the cost of every private transaction, which set a firm limit on how many users a privacy chain could serve without centralizing verification onto a few powerful machines. Proof aggregation removes that limit directly, and doing the work in a shared library rather than a single client means wallets and other node implementations inherit the improvement rather than reimplementing it.

The risk is equally concrete. Aggregation changes what a verifier checks, and that is exactly where soundness defects arise, as Aztec's disclosure this week showed on a different network. Zcash is shipping the pieces into audited-in-advance library code rather than switching consensus first, which is the slower and more conservative order of operations.