The effort to bring the privacy features of zcash to ethereum took a step forward today during testing for the upcoming Byzantium upgrade.

A zero-knowledge succinct non-interactive arguments of knowledge, or zkSNARK, is used to prove that data is valid without actually revealing what that data is. The technology sits at the heart of the zcash network, and recent months have seen developers moving to integrate the privacy tech into ethereum.

Earlier today, the zkSNARK part of a zcash transaction was verified on the Byzantium testnet. While only a trial, the development is a critical step toward bringing that kind of functionality to the public ethereum network.