Sequentia docs

3.6. Full node sovereignty

Every node on the network can be a Sequentia validator, and block proposers cannot enforce changes to Consensus rules on full validator nodes.
Anybody can run a Sequentia validator node, independently of the amount of SEQ at stake, exactly like a Bitcoin full node functions without holding any bitcoin while processing, validating, and accepting transactions broadcasted by the network. Also, the stakers selected by the algorithm to act as block proposers cannot arbitrarily force, even if in the majority, a Consensus rule change, just like bitcoin miners cannot force other nodes to upgrade their software.
In case a malicious majority changes the Consensus rules, accepting and countersigning blocks that are invalid for a minority of stakers, the enforce consensus rule applies:
If there exists a block b0 that breaks the consensus rules but is certified, meeting the quorum of countersignatures, then a valid block b1 at the same height of b0 can be certified with a new quorum representing the majority of the blocksigners that have not countersigned b0. If that quorum cannot be met and the hard-forked chain stalls, the escaping stall clause can be applied.