Sun, XinSopek, MirekWang, QauanlongKulicki, Piotr2020-05-262020-05-262019-09-12"Entropy" 2019, 21(9), 887http://hdl.handle.net/20.500.12153/1158While Blockchain technology is universally considered as a significant technology for the near future, some of its pillars are under a threat of another thriving technology, Quantum Computing. In this paper, we propose important safeguard measures against this threat by developing a framework of a quantum-secured, permissioned blockchain called Logicontract (LC). LC adopts a digital signature scheme based on Quantum Key Distribution (QKD) mechanisms and a vote-based consensus algorithm to achieve consensus on the blockchain. The main contribution of this paper is in the development of: (1) unconditionally secure signature scheme for LC which makes it immune to the attack of quantum computers; (2) scalable consensus protocol used by LC; (3) logic-based scripting language for the creation of smart contracts on LC; (4) quantum-resistant lottery protocol which illustrates the power and usage of LC.enUznanie autorstwa 4.0 Międzynarodowehttps://creativecommons.org/licenses/by/4.0/deed.plblockchainquantum computingconsensusdigital signaturelotteryinfo:eu-repo/semantics/article10.3390/e21090887