How do you know if your shitcoin is actually quantum resistant?
Well, you could ask your shitdevs. But then again, they’d probably answer they hash their pub keys so no one could use the full pub key to derive the private key from. Which is BS, because all transactions will eventually carry the full pub key which creates the opportunity to do so anyway. Network based attacks, or off network MITM attacks would always be a possibility to get to the full pub key, so only if a blockchain uses a quantum resistant signature scheme (not as an option, but as the only vallid signature scheme), then you would know if your shitcoin is quantum resistant.
Quantum computers give way to new (quantum) algorithms that can make faster calculations and need fewer steps to come to an answer. If you use different type of signature schemes, these algorithms are not able to find the answer, even by using a quantum computer. These are quantum resistant signature schemes. If we move away from the subject shitcoins and talk QRL, you will see QRL used XMSS as a quantum resistant signature scheme. See for reference here:
https://eprint.iacr.org/2011/484.pdfNIST is holding a competition from which they expect to come to standardization of the best quantum resistant cryptography. The outcome of that competition will be somewhere around the year 2022-2024. That will take a while. XMSS however, is not part of that competition because it requires the system that you use it for to keep state. Not all systems can do so fully guaranteed. The outcome of the NIST competition should be a type of cryptography that can be used wide spread, so also for systems that can’t keep track of state. For blockchain however, it is possible to keep state if XMSS is implemented correctly. For QRL this is the case. They have an advisor Leon Groot Bruinderink, who is a post-quantum cryptography expert with a PhD on the matter. Also QRL has had two external audits. So that’s solid. Going back to NIST: they likely will standardize XMSS for a specific group of applications that can deal with the statefull properties. See for reference here:
https://csrc.nist.gov/news/2019/stateful-hbs-request-for-public-comments As you see Bruinderink is mentioned in the NIST article. Note that the request for comments is to provide guidance for protection of misuse, and specific characterization of advisable usecases. The part where we wonder if it actuallyy is quantum resistant is in the past. It is considered to provide provable quantum resistant security.
This will mean XMSS and LMS will quite likely be the first quantum resistant signature schemes to be standardized. Which is huge as you might imagine.