Why aren't post-quantum signatures used in Kaspa yet?

No post-quantum signature scheme is ready for use in a live blockchain like Kaspa — the available options all carry serious drawbacks. Lamport signatures, one of the oldest post-quantum designs, are very space inefficient, meaning each transaction would consume far more storage than today's signatures. The newer candidates endorsed by NIST's post-quantum standardization process are more promising, but they have not yet withstood enough cryptanalysis to be trusted at scale — and the fact that some runner-up candidates were found to be exploitable shows how real that concern is. Even the leading finalists require about ten times more storage in the best case. For a beginner, the takeaway is that switching to quantum-safe cryptography is not just a flip of a switch — it requires a scheme that is both proven secure and practical to run, and the industry hasn't found that combination yet.