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Ivan Ivanitskiy
2019-06-22 23:12:55 +03:00
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# LAZY SNARK
### trustless off-chain zk-proof verification
# LAZY SNARK: trustless off-chain zk-proof verification.
## Abstract
In Ethereum, it is expensive to check zk-proofs on-chain, so we propose to use Fluence to do heavy-lifting off-chain and only go on-chain to challenge incorrect data/proof combination.
## Why
Let us say, we need to verify zk-proofs in Ethereum smart contract. The problem is that zk-proof verification is a heavy computational task and thus costs a lot of gas. As a result, checking proofs on-chain is not only expensive, but also takes a lot of space in the block. This may lead to serious problems, e.g. in case of mass exit.
## What
We suggest checking proofs on Fluence instead. This option does not has gas problem, is much cheaper, but is also trustless.
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## How it works
The process includes the following entities:
- Ethereum smart contract that stores (data, proof) pairs and implements on-chain proof verification. In case the proof is not correct, the smart contract rewards the user who checked this proof with ether.