ZKSNARK
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zk-SNARKs are used to construct non-interactive zero-knowledge proofs and are applied as a solution to the privacy of transactions on the blockchain and the scaling problem of Ethereum. In addition to the three properties of zero-knowledge proofs, four properties of SNARK are added.
zk-SNARKs have the advantage of reducing the cost not only in zero-knowledge proofs but also in the verification process because they have concise properties. Zk Rollups significantly reduce costs by combining multiple transactions into one, and can verify all transactions included without verifying each one individually.