ZKsync Era is a Layer 2 ZK rollup, a trustless protocol that uses cryptographic validity proofs to provide scalable and low-cost transactions on Ethereum. In ZKsync Era, computation is performed off-chain and most data is stored off-chain as well. Transactions are bundled into batches before generating a validity proof. As all validity proofs are proven on Ethereum, users enjoy the same security warranties as in the L1.