A letter by a group of Democratic members of the US Congress attacking proof-of-work (PoW) mining and praising proof-of-stake (PoS) is causing an uproar in the Bitcoin (BTC) community, with crypto exchange Kraken CEO Jesse Powell claiming that “PoS fanatics attacking PoW are actual supervillains.”...Read More: ‘PoS Fanatics Attacking PoW are Actual Supervillains’, Kraken’s Powell Says as US Politicians Charge