As per discussions in validator meeting. Introduce a circuit breaker to temporarily de-activate certain message types.

When:

• Network is live
• Governance module is not compromised

Circuit breaker needs 1/6th of total voting power to be activated. Will be de-activated after X blocks or if de-activation is voted (can be de-activated with a proposal).

Message type of circuit breaker transactions should be gov (because we only assume that governance module is not compromised).

When submitting a circuit breaker transaction, one must specify:

• Motive
• Which message types to deactivate (gov messages cannot be deactivated).

Need to add the ability for proposals to de-activate circuit breakers if accepted. Also need a special de-activation message.

Pulling in @sunnya97 to refine.