2 x 21 = 42

21 millions btc + 21 millions btc from antimatter = 42

21 millions btc matter + 21 millions #btc from antimatter = clean energy

Bitcoin Mining = clean energy

May be is the 42 #Bitcoin #Mining? :)

https://www.scientificamerican.com/article/for-math-fans-a-hitchhikers-guide-to-the-number-42/#:~:text=Take%20author%20Douglas%20Adams's%20popular,is%20%E2%80%9Cforty%2Dtwo.%E2%80%9D