One of the largest aggregation networks on Ethereum has finally started testing Proof of Fault.

Optimism serves as a “layer 2” blockchain that covers user transactions and settles them cheaply on Ethereum. It has played a leading role in expanding the reach of the second largest blockchain ecosystem by market capitalization - and serves as the template for the layer 2 network of cryptocurrency exchange Coinbase, Base .

But there's a problem with using Optimism today: error proof, a key component of Layer 2 security, doesn't even exist yet. This will change soon.

On Tuesday, OP Labs, the main development company behind the Optimism blockchain, will begin testing proofs of fault tolerance on Ethereum's Sepolia testnet. The new implementation comes months after Optimism launched the first version of its fault-tolerant proofs on Goerli, another Ethereum testnet, in October. Carl Flo, Optimism co-founder and Director OP Labs executive, hopes these proofs will hit the Ethereum mainnet by the end of the year, and the Sepolia deployment will bring the team closer to that goal than ever.

This technology will help ensure funds are withdrawn from the network and has been for a long time – opening up the Optimist ecosystem to embarrassing criticism from competing blockchain advocates.

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