According to specs, for proposer slashing i need to compare the slot with previous block.slot
my question is- is it enough to check that the current block slot is greater than the last block slot i saved to the hard disk or do i need to save all the slots since my first validator created?
Also, do i use the same data for all my validator clients (and their validators)? i mean if i actually can save only the last slot, i need to save the last slot for each validator or one for all of them (the maximal)?
I was based on this info: https://github.com/ethereum/eth2.0-specs/blob/dev/specs/phase0/validator.md#how-to-avoid-slashing
