What is zkSync Era Mainnet (Matter Labs)?

Ethereum, a major blockchain, struggles to handle many transactions cheaply, so its community has built "Layer 2" chains that extend it and lean on its security. Zero-knowledge rollups are one kind of Layer 2: they bundle many transactions and post a cryptographic proof of them to Ethereum. They draw on zero-knowledge proofs, a cryptographic method where one party convinces another that a statement is true without revealing anything beyond that fact. zkSync Era is a chain of this kind. Its code is published on GitHub under the Matter Labs organisation, and it later grew into the wider ZKsync network of linked chains.

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