Cardano assigns CPS-0030 to quantum-secure settlement problem statement

What happened.

A commit in Cardano’s Improvement Proposals repository assigned CPS number 30 to a problem statement titled “Quantum-secure settlement layer.” The statement covers quantum attacks on affected cryptographic primitives, post-quantum planning across ecosystems, and the unresolved question of a fair transition for old funds.

This is an early standards-track framing step. It puts the settlement-layer problem on record, but it is not a ratified CIP, a selected post-quantum scheme, or an on-chain change.

Why it matters.

The assignment signals that Cardano contributors are formally scoping how a future move toward post-quantum cryptography could affect signatures and settlement. That is relevant across the ecosystem because current keys rely on today’s cryptographic primitives.

The difficult part is not established by this record: it does not say which scheme could be used, how a transition would work, or when any change might occur. The treatment of existing funds is explicitly still open.

What to watch next.

The next useful receipt would be movement from the CPS problem statement toward a CIP, including a proposed post-quantum signature approach and a clearer account of how existing funds could be handled. Until then, CPS-0030 is a scoped question rather than a deployed solution.