Maybe I'm a bit tunnel-visioned at this point, but I am trying to get a technical grasp of how a Proof of Stake algorithm works.
I understand that a validators are chosen semi-randomly based on the amount of coin they are staking. Then 128 validators have to "attest" to each (shard) block. But once a validator is chosen, what actually happens during the validation / verification process? According to The Motley Fool
Since proof of stake doesn't require validators to all solve complex equations, it's a much more eco-friendly way to verify transactions.
If it's not solving "complex equations", what is it doing?