Concept comparison
Proof of Work vs Proof of Stake
Two ways to make Sybil attacks expensive: burn external energy or put internal capital at risk.
Dimension
Proof of Work
Proof of Stake
Scarce resource
Electricity and specialized computation.
Staked native assets locked as collateral.
Takeaway: Both replace one-person-one-vote with one-costly-resource-one-vote.
Attack cost
Takeaway: The honest-chain incentive comes from making attacks expensive.
Failure mode
Validator collusion or client bugs can threaten liveness or safety.
Takeaway: Neither gives attackers private keys or arbitrary wallet control.
Operational profile
High energy use, simple external cost signal.
Lower energy use, more protocol complexity.
Takeaway: The tradeoff is not only energy. It is also social and technical complexity.