My understanding of proof of work is that basically (miners/CPUs provide power to write transactions on the blockchain) whereas Proof of stake (is when we hold a certain currency and lock it into the systemso liquidity increases).Please correct me if im wrong.
Also why is it that only some coins can be staked?What are the conditions for a coin to be eligible to be staked?
And why are the returns on staking different on different exchanges?Is it simply due to difference in commission ,as logically the return on staking should be universally same depending upon the lock in period?