Proof of work is a family of blockchain consensus mechanisms in which participants expend computational effort to compete for the right to propose blocks and extend the accepted transaction history.
In proof-of-work systems such as Bitcoin, miners repeatedly perform hash computations until a valid result satisfies the protocol's difficulty target. Other nodes verify the result cheaply and apply consensus rules to determine the accepted chain. Security relies in part on the cost of acquiring enough computational power to rewrite or disrupt the ledger. The model can consume substantial energy because block production requires continuous computation.
Proof of work uses computational work as a central security resource. Proof of stake uses committed economic stake and protocol penalties as central elements of consensus.
Consensus choice determines how transactions are ordered, how reversal risk declines, and what resources protect the ledger used for digital-asset transfers.
A proof-of-work miner can include a stablecoin-related transaction on a compatible network after producing a valid block under that network's consensus rules.