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![Vicostly Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::1930410713043873792.png) Vicostly [@Vicostly](/creator/twitter/Vicostly) on x XX followers
Created: 2025-07-24 20:12:15 UTC

Fraud proofs are the backbone of rollups.

But most of them? They’re kinda... offchain.

@Arbitrum’s about to change that — with BoLD.

What it is, why it matters, and why it’s way more than a dev update:
🧵👇

![](https://pbs.twimg.com/media/Gwpg4gQWoAA9bdo.jpg)

XX engagements

![Engagements Line Chart](https://lunarcrush.com/gi/w:600/p:tweet::1948476340422017245/c:line.svg)

[Post Link](https://x.com/Vicostly/status/1948476340422017245)