PoS
Overcoming censorship is not possible in a PoS system, as the censor has acquired majority stake and cannot be unseated.
??? Although censorship can be prevented by use of blind signatures (also described in Cha83), どうやってつぎのブロック選ぶ？
正しく選ばれたか検証できる？
Proof-of-stake comes with a number of improvements to the proof-of-work system:
better energy efficiency – you don't need to use lots of energy mining blocks
lower barriers to entry, reduced hardware requirements – you don't need elite hardware to stand a chance of creating new blocks
stronger immunity to centralization – proof-of-stake should lead to more nodes in the network
stronger support for shard chains – a key upgrade in scaling the Ethereum network
ブロックを生成するコスト自体はかからないけど大丈夫？
PoW も difficutly が低ければ同じか？ PoW は全 Full node が Validate する