HashcashAdam 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. is a 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 used to combat denial-of-service (DDoS) attacks. HashcashAdam 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. is used in cryptocurrencies as part of mining algorithms.

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