1. Fersht, P.: The top 5 enterprise blockchain platforms you need to know about.
https://www.horsesforsources.com/top-5-blockchain-platforms_031618
. Accessed 20 Mar 2019
2. Average Confirmation Time.
https://www.blockchain.com/ru/charts/avg-confirmation-time
3. Cryptographic hash function.
https://en.wikipedia.org/wiki/Cryptographic_hash_function
4. SEC 2: Recommended Elliptic Curve Domain Parameters.
http://www.secg.org/sec2-v2.pdf
5. Digital Signature Algorithm Patent.
https://patents.google.com/patent/US5231668