And the algorithm used has weaknesses and undesirable properties (nothing-at-stake-problem), which is why it's not used elsewhere. Here's some introductory rea

And the algorithm used has weaknesses and undesirable properties (nothing-at-stake-problem), which is why it's not used elsewhere. Here's some introductory reading: https://github.com/ethereum/wiki/wiki/Proof-of-Stake-FAQ https://github.com/ethereum/wiki/wiki/Proof-of-Stake-FAQ