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.
Miners activities in the proof of work system is only to write transaction the blockchain but to also maintain and secure the network.
Meanwhile, you participate in both POW and POS projects independently though the cryptographic decision is usually made through consensus i.e if the project is decentralized.
Also why is it that only some coins can be staked?
Every coin has its own consensus but some exchange sites offer staking for POW but saving your coins for the long term on an exchange is not encouraged though.
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?
Their exchange their rules