1. S. Brakeville, B. Perepa, “Blockchain Basics: Introduction to Distributed Ledgers”, https://tinyurl.com/ya6g6v2w
2. E. Buterin, “Ethereum Scalability and Decentralization Updates”, https://tinyurl.com/y83q53h9
3. P. Evans, “A Strategic Perspective on Blockchain and Digital Tokens”, https:// tinyurl.com/hqldvyq
4. M. Herlihy, M. Moir, “Enhancing accountability and trust in distributed ledgers”, https://arxiv.org/pdf/1606.07490.pdf
5. P. Rizzo, “World's Largest Mining Company to Use Blockchain for Supply Chain”, https://tinyurl.com/y85eh24t