zkSync is a two-tier extension solution that provides cheaper and faster transactions than the Ethernet master chain (Tier 1). The Layer 2 solution removes most of the activity from one layer, while still maintaining its security and end result.

The advantage of its significantly lower fuel costs without sacrificing security and user control

Benefits of zkSync Low fuel cost: maximum fuel cost is 1/100th of L1, cheaper than using optimalrollups High speed: 2000+ transactions per second (tps) compared to 14tps for L1 Security: protected by the ethereum main chain Hassle-free transfer: easily move cryptocurrency between L1 and L2 without delay Anti-audit: you can move assets back to L1 at any time Introduction to the principles of zkSync How zkSync works zkSync is part of a set of two-tier solutions called rollps. More specifically, zkSync is a ZK rollup (ZK stands for "zero knowledge", a cryptographic term that means one party can prove to the other party that something is true without having to disclose any other information)

What is rollup? rollup works by packaging or "aggregating" off-chain transactions into smaller transactions and sending them to the first layer. By sending transactions back to L1, rollup inherits the security and end result of the ethereum blockchain.

There are two types of rollups: zero-knowledge ZK and optimal. Here we only discuss ZK rollups.

What isZK rollup each batch of transactions is sent to an off-chain verifier that generates cryptographic certificates (called SNARK in zkSync) to prove that these transactions are valid. While it is difficult to generate a proof, it is easy to verify that the proof is valid. This means that it can be sent to L1 and validated in the smart contract. This makes the transfer between L1 and L2 almost frictionless.

zkSync and Dapps While Dapps will be able to be built on zkSync, the platform is not yet ready. It will also be compatible with the Ether Virtual Machine (EVM), which means you will be able to easily transfer existing smart contracts on L1 to L2.

zkSync is being developed by Matter Labs, who have secured funding from top investors such as the Ether Foundation and Union Square ventures. zkSync has been running since September 2020.

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