Cardano's Leo 0 setting prohibited, emergency shutdown proposal conflicts with constitutional amendment

Cardano’s emergency mechanism for halting its Linear Leios scaling feature has collided with a proposed constitutional amendment, with the dispute centering on whether the constitution permits disabling an extra transaction-processing path during an outage rather than on any actual failure. Ecosystem organization Intersect said in its Nov. 6 weekly update that the fifth version of constitutional amendment CAP-12, published Oct. 30, bars setting Leios parameters to zero and removed the on-chain shutdown provision from the constitution’s main text. The disable option now remains only in the hard-fork plan, and roughly 30 parameter values are still under review. Leios routes transactions that cannot fit in regular blocks into separate endorser blocks that are voted on and certified before reaching the chain. The standoff matters because it leaves Cardano without a constitutionally enshrined way to switch off the scaling path in an emergency; what to watch is whether the remaining parameter review and hard-fork planning resolve the gap before Leios activation.