zk-rollups are an off-chain protocol and layer-2 scalability solution for the Ethereum blockchain. It allows blockchains to validate transactions faster while reducing gas fees. On-chain transaction fees and congestion make it difficult for layer-1 blockchains to meet full user demand. As the number of users increases, so does the number of transactions making L1 slow and costly to use. Using zk-rollups, layer-2 transactions can be validated faster than with layer-1 networks because they allow for off-chain processes.
Zk-rollup’s off-chain computation allows millions of transactions to be bundled into one single transaction, reducing traffic and data posted on the parent blockchain. Transactions are taken off the parent-chain and are processed on an off-chain layer-2 network. These transactions are processed in a batch and transformed into a short rolled-up summary that is then sent back to the parent chain. This single rollup includes validity proofs and defines what changes need to be made to the blockchain.
In other words, the blockchain receives only the answers to a maths problem, without having to compute the equation and process all the data. zk-rollups are the needed solution for developers, investors, and traders who are looking to boost usability and ensure faster and cheaper transaction processing.