Proof-of-Stake (vs proof-of-work)
https://www.youtube.com/watch?v=M3EFi_POhps
Cryptocurrencies use a ton of electricity because of mining. In recent years people started working on a different technique called Proof-of-Stake. Not only does it use less energy, it can also be more secure. (This video is a re-upload to fix a mistake I made in the previous one. Sorry about that!)
