Flash bots is a company that developed software called MEV Boost. It's used by about nine validators, 90% of which talk to the MeV Boost software in order to build their blocks for them or external it's called external block building. And there are a bunch of relayers that you can connect to as a validator, and it'll build your block that way. This exploit that happened wasn't exploit in the MEV Boost relay software that allowed this to happen. Now this has actually since been patched, but the patch has also led to its own negative consequences. But from my understanding, should make this impossible to do again.

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