Cardano Proposal Weighs Emergency Leios Scaling Deactivation

Cardano developers and community members are reviewing a potential governance adjustment that could provide a faster method to disable the upcoming leios cardano scaling system during severe network incidents while keeping normal restart procedures intact. The technical proposal, introduced by Kevin Hammond as Cardano Amendment Proposal 12, aims to establish a Technical Steering Committee position ahead of an upcoming review.

CAP-12 sets parameters for the Dijkstra era of the protocol. A key challenge involves current constitutional drafts that explicitly forbid setting certain Leios parameters to zero, which is the exact value required to halt the supplementary transaction processing path. Hammond’s approach would relax notice and frequency limits for emergency deactivations during Severity 1 or Severity 2 network issues. This would waive standard notice requirements and permit the transition to zero in any epoch, intending to disable additional transaction handling while leaving ordinary block production running via Praos.

Understanding the leios cardano upgrade debate

The protocol switch remains conditional upon written confirmation from the Linear Leios team regarding the exact effects of the zero setting. Additional requirements include test network exercises on Preview and Preprod environments, conformance testing across all node implementations, and verification that node behavior matches the existing Praos system. Reverting the change and switching Leios back on would follow ordinary governance processes, including delegated representatives, the Constitutional Committee, and stake-pool-operator votes.

Meanwhile, Intersect updates and working-group minutes indicate that test networks entered the Dijkstra era using node 11.2 without full Leios implementations. Development continues on endorser-block forging, certificate checks, and vote relaying, with combined node releases estimated to be weeks away. The Parameter Committee must still review pending numerical values as working groups aim to submit final constitution drafts and guardrails.

Hammond proposes an emergency fast path to disable Cardano Leios scaling during severe network issues.

Why it matters

This governance discussion highlights the complex balance between deploying high-throughput scaling solutions and maintaining strict constitutional guardrails on a decentralized blockchain network. Resolving the friction between emergency operational controls and foundational protocol rules affects how quickly core developers can respond to unforeseen network stability risks.