Hashcash
Hashcash is a proof-of-work system designed to combat email spam and denial-of-service attacks. It requires the sender of an email or network request to perform a certain amount of computational work, generating a hash value that meets specific criteria. This proof-of-work requirement makes it costly and time-consuming for spammers or attackers to flood a network with requests. Hashcash provides a mechanism to deter abuse and ensure that computational resources are dedicated to legitimate activities. It served as an inspiration for the proof-of-work consensus algorithm used in Bitcoin and other cryptocurrencies.
![Hashcash](https://d11o3uem5z904q.cloudfront.net/glossaries/codeZeros5ot728161707389229103.jpg?imwidth=1920&q=75)
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