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2. Statista distribution of cryptocurrency mining pools worldwide 2018, by region. https://www.statista.com/statistics/731449/geographical-distribution-of-mining-pools/. Accessed 15 Mar 2020
3. blockchain.com Blockchain size. https://www.blockchain.com/charts/blocks-size. Accessed 1 Apr 2020
4. blockchain.com Total number of transactions. https://www.blockchain.com/charts/n-transactions-total. Accessed 1 Apr 2020
5. Statista video game consoles. https://www.statista.com/outlook/14070000/100/video-game-consoles/worldwide. Accessed 10 Mar 2020