1. The first decentralised digital currency, "A Peer-to-Peer Electronic Currency System," was introduced by Nakamoto Satoshi on March 20, 2014. He also invented bitcoin and the first blockchain.
2. Andrew Lippman, Azaria, Asaph, Ariel Ekblaw, and Thiago Vieira. Utilizing Blockchain for Medical Data Access and Permission Management is described in "MedRec." pp. 25–30 in Open and Big Data (OBD), International Conference on. IEEE, 2016.
3. Computer Networks: The International Journal of Computer and Telecommunications Networking, December 2017, Yaqoob, E. Ahmed, I. A. T. Hashem, A. I. A. Ahmed, A. Gani, and M. Imran.
4. "A Peer-to-Peer Electronic Currency System," initially published on March 20, 2014, by Nakamoto Satoshi, inventor of bitcoin, first blockchain implementer, and first decentralised digital currency.
5. Nicole J. Goodman and Jon H. Pammett, "Online Voting in a Municipal Election in Canada," Studies in Public Choice 31, edited by Bernard Grofman, Alex Trechsel, and Mark Franklin, Springer Verlag, 2014.