Ethereum rollups at Stage 1 require a 75% approval (at least 6-of-8 votes) from the security council to override trustless proof systems, ensuring at least three external council members

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In stage 1, a security council can override with approval of 75% (at least 6 of 8). Meanwhile, in stage 2, the security council can only act in case of provable bugs. Provable bugs could be two redundant proof systems, like the OP and ZK.

Stage 1: security council can override with 75% (at least 6-of-8) approval. A quorum-blocking subset (ie. >= 3) must be outside the primary organization. Hence, there is a high, but not impassable, barrier to overriding the proof system.