An alternative to the proof-of-workAdam Back is the inventor of hashcash, which is a proof-of-work system used by several anti-spam systems. It in turn inspired a similar system in bitcoin. system, in which existing stake in a cryptocurrencyA fee imposed on some transactions sent across the network such as the network that supports bitcoin. It is awarded to the miner that successfully hashes the block containing the relevant transaction. is used to calculate the amount of that currency one allowed to mine. A proof of stake system requires the prover to show ownership of a certain amount of money rather than requiring a user to perform computational work,

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