Aztec

Aztec is a privacy and scalability solution based on ZK Rollup. It has a two-layer zk-zkRollup with zero-knowledge circuits. One layer of zk is used to encrypt private user transactions, and the second layer of zk is used to compress transactions, allowing Aztec to succinctly prove a large number of Encrypted state transitions and not compatible with EVM. It announced in March that it was shutting down its privacy infrastructure Aztec Connect