Slightly related "Mining Bitcoin with pencil and paper: 0.67 hashes per day" https://www.righto.com/2014/09/mining-bitcoin-with-pencil-an... (Almost a 800 comments split in 3 discussions, https://news.ycombinator.com/item?id=26146026 https://news.ycombinator.com/item?id=15950599 https://news.ycombinator.com/item?id=8380110)