1. How to time-stamp a digital document;Haber,1990
2. Bitcoin: A Peer-to-Peer Electronic Cash System;Nakamoto,2019
3. A certified digital signature;Merkle,1989
4. Blockchain mutability: Challenges and proposed solutions;Politou;IEEE Trans. Emerg. Top. Comput.,2019
5. Blockchain: A tale of peer to peer security;Acharjamayum,2018