But how does POS actually validate a transaction? Bitcoin miners have to solve the puzzle, but POS miners just have lots of the coin??
The more coins you have staked, the greater your chances to mine the next block. Your mining power or potential to validate blocks is determined on how much of the native token you already own and have put up for staking.
You can find plenty of articles on the subject if you google "
how are transactions confirmed in POS coins" or some combination like that.