1. Antonopoulos, A.M.: Mastering Bitcoin: Unlocking Digital Cryptocurrencies. O’Reilly Media, Sebastopol (2014)
2. Antonopoulos, A.M., Wood, G.: Mastering Ethereum: Building Smart Contracts and DApps. O’Reilly Media, Sebastopol (2019)
3. Biggs, J., Nelson, D.: Upbit is the seventh major crypto exchange hack of 2019. In: CoinDesk.
https://www.coindesk.com/upbit-is-the-sixth-major-crypto-exchange-hack-of-2019
. Accessed 17 Apr 2020
4. BitInfoCharts Bitcoin, Ethereum Market Capitalization Historical Chart.
https://bitinfocharts.com/comparison/marketcap-btc-eth.html
. Accessed 31 Jan 2020
5. Bleumer, G.: Threshold signature. In: Encyclopedia of Cryptography and Security – 2011 Edition, pp. 1294–1296. Springer, Boston (2011)