Abstract is a layer 2 (L2) blockchain that creates batches of transactions and posts them to Ethereum to inherit Ethereum’s security properties. Specifically, Abstract is a ZK Rollup built with the ZK stack. By posting and verifying batches of transactions on Ethereum, Abstract provides strong security guarantees while also enabling fast and cheap transactions.

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What is a Layer 2?

A layer 2 (L2) is a collective term that refers to a set of blockchains that are built to scale Ethereum. Since Ethereum is only able to process roughly 15 transactions per second (TPS), often with expensive gas fees, it is not feasible for consumer applications to run on Ethereum directly. The main goal of an L2 is therefore to both increase the transaction throughput (i.e. how many transactions can be processed per second), and reduce the cost of gas fees for those transactions, without sacrificing decentralization or security.

Ethereum Docs - Layer 2s

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What is a ZK Rollup?

A ZK (Zero-Knowledge) Rollup is a type of L2 that uses zero-knowledge proofs to verify the validity of batches of transactions that are posted to Ethereum. As the L2 posts batches of transactions to Ethereum, it is important to ensure that the transactions are valid and the state of the L2 is correct. This is done by using zero-knowledge proofs (called validity proofs) to confirm the correctness of the state transitions in the batch without having to re-execute the transactions on Ethereum.

Ethereum Docs - ZK Rollups

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What is the ZK Stack?

Abstract uses the ZK stack; an open-source framework for building sovereign ZK rollups.

ZKsync Docs - ZK Stack

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