2022-12-29 23:46:13
Arbitrum has recently brought up a discussion on Medium about Delay Attacks on Rollups. https://bit.ly/3jEz8bu In short, their post raises an important issue that affects all optimistic rollups that are based on interactive verifications, such as Optimism, Arbitrum, Cartesi, Truebit, etc.
Although the attack does not compromise the security of the rollups chain, it allows a well-funded party to delay its finality by continuously burning collaterals for the duration of the attack.
This news could have been worrisome, since it affects several different protocols. However, Delay Attacks are far from an unsurmountable problem.
First of all, Arbitrum itself has announced in their article that they know a solution to the problem. They have announced a new protocol to be published soon, which is already being implemented.
On another front, Cartesi’s contributors have also worked to tackle this Delay Attack and they have just published a solution to the issue in this article. https://arxiv.org/abs/2212.12439
In summary, under Cartesi’s proposal, a team of dishonest parties with x funds can be defeated in a single dispute by an honest player who is willing to deposit log(x) funds. This makes Delay Attacks impossible and sibling attacks impractical.
Retweet: https://twitter.com/erickdemoura/status/1608440133816131586
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