The network of Ethereum layer-2 rollups using zkSync’s ZK Stack got a new addition Thursday, with the launch of the Cronos zkEVM testnet.

Blockchain developer Cronos Labs is developing its third blockchain, which is the first to use ZK Stack hyperchain to reach a live testnet.

The first chain in the Cronos ecosystem was a Cosmos appchain developed in partnership with the Crypto.com exchange and launched in 2021. Cronos then followed up with an EVM-compatible chain, also built using the Cosmos SDK in 2022. This new effort augments, but does not replace, the prior two chains.

Cronos’ zkEVM is the result of a collaborative effort involving Cronos Labs, Matter Labs (the team behind…

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