Related: You can have a functioning and _secure_ decentralised blockchainless cryptocurrency through local quantum computation _without_ quantum communication:

Related: You can have a functioning and _secure_ decentralised blockchainless cryptocurrency through local quantum computation _without_ quantum communication: https://iohk.io/en/research/library/papers/one-shot-signatures-and-applications-to-hybrid-quantumclassical-authentication/ https://iohk.io/en/research/library/papers/one-shot-signatur... (excerpt) > We show that one-shot signatures have numerous applications for hybrid quantum/classical cryptographic tasks, where all communication is required to be classical, but local quantum operations are allowed. Applications include one-time signature tokens, quantum money with classical communication, decentralized blockchain-less cryptocurrency, signature schemes with unclonable secret keys, non-interactive certifiable min-entropy, and more. We thus position one-shot signatures as a powerful new building block for novel quantum cryptographic protocols.