Optimism is a blockchain that uses Optimistic Rollups technology, which reduces the cost of transaction fees tenfold compared to the first level of the Ethereum network. Allows you to easily deploy any smart contracts and decentralized applications written in the Solidity language on the second-level network.

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Optimism

SHERLOCK

Quick heads up to developers: a hardfork of Optimism Goerli is planned for March thanks to efforts by @sherlockdefi Watsons. 

No downtime is expected, but those running their own nodes will need to update in advance to continue syncing.