Abstract: The security of blockchain technology, depending on the encryption algorithms based on the one-way mathematical calculation difficulty, is vulnerable to the attack under exponential acceleration of quantum computers. Although a series of anti-quantum attack blockchains have been proposed, they are often too expensive to build and are not conducive to popularization. In this regard, a quantum-encrypted blockchain based on delegated proof of stake (DPoS) extension is proposed. Comparing with the original quantum-secured blockchain proposed by Kiktenko, the number of quantum key distribution (QKD) channels needed to be built is reduced from $O({n}^{2})$ to $ O\left(n\right) $, and the maximum number of communication rounds required is reduced from $ n/3+1 $ to $ k/3+1 $. It significantly reduces the construction cost, and improves the operation efficiency and expansion ability.

Key words: blockchain, delegated proof of stake, distributed technology, quantum cryptography