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A Blockchain or Recordchain Is Essentially an Asymmetric Identity Chain

• 1、College of Computers, Nanjing Univ. of Aeronautics & Astronautics, Nanjing 211106
• 2、School of Network Securities, Information Engineering University, Zhengzhou 450001
• 3、School of Computers, University of Chinese Academy of Sciences, Beijing 100039
• 4、 Laboratory of Computational Complexity, BFID Corporation, Beijing 100098

Abstract：This paper presents first the definition of a bitcoin, and the definition and effect of a blockchain. The paper points out that decentralization is not the characteristic of a blockchain, but the characteristic of a bitcoin, and that a digital signing algorithm and a hash function are not only the kernel techniques of a blockchain, but also the innovative knob of a blockchain. The paper discusses symmetric identities and asymmetric identities, and expounds that a blockchain is essentially an asymmetric identity chain. The paper designs and constructs a greatly centralized recordchain which is used to implement the trusted transference of a digital draft, namely to assure the authenticity, integrality, and undeniableness of a transferred digital draft. Lastly, the paper draw a comparison between a blockchain and a recordchain which includes samenesses and differences, and especially itemizes that a recordchain is quantum-safe.

Keywords： Bitcoin Blockchain Digital Signing Algorithm Hash function Asymmetric identity Digital draft Recordchain, Trusted transference Quantum security