https://www.technologyreview.com/s/608041/first-quantum-secured-blockchain-t...
Moscow has not been friendly towards non-Fiat cryptocurrency. The actual paper... Quantum-secured blockchain - Kiktenko https://arxiv.org/abs/1705.09258 And the only cryptocurrencies people should trust will be the Distributed P2P Transaction Mineable AnonPriv Cryptocurrencies, aka not Fiat, else there's no point, just use GovCoin, BankCoin, or CorpCoin, they're all the same... ShitCoin.
This technology, if it exists, which I doubt, secures the channels through which crypto coins are sent
Considering end users won't be able to buy the quantum hardware, optical links, etc needed for the QKD anytime soon... privacy coins over Mix Darknets WiFi are for now at least reasonable channel security for some use cases. This paper blurbs Zcash and Loopix ... Extending the Anonymity of Zcash - Kappos, Piotrowska https://arxiv.org/abs/1902.07337 And note that software PQC for all the parts... secure keying, algos, passphrases, blockchain bits, etc, is also rolling.. https://en.wikipedia.org/wiki/Post-quantum_cryptography https://pqcrypto.org/ https://csrc.nist.gov/Projects/Post-Quantum-Cryptography infohash:B07C61F8452F23B9D9936551D1A6DE7CF61FDD9F infohash:3233EBD08587C5E8B806B2B5375BF4975E8A2519
Which messages are then added to the blockchain in the clear, for everyone to see, forever.
Which means it's no better than Fiat, thus pointless. At last survey long ago, afaik only the Zero Knowledge Proof ZKP family of coins, Zcash.io ZEC, Zencash ZEN, Zclassic ZCL, etc, had actually put the entire transaction behind strong cryptography... senders, receivers, amounts, change, etc. Monero XMR, the CoinJoin family, etc, are all doing other approaches. And there's no real reason to hold anything other than the UTXO database set. Lots of projects are working on distributed consensus state machines now... https://blog.acolyer.org/2019/03/08/a-generalised-solution-to-distributed-co... https://news.ycombinator.com/item?id=19343398 With luck everything in cryptocurrency will be far more advanced, anon / private, scalable, and adopted by 2029. Someone really should maintain a list of cryptocurrency projects that are seriously working on these topics instead of being just another ICO, token, centralized censorable spyable Fiat, etc.