Questions tagged [hashcash]

Hashcash is a mechanism to prove that the sender of a message is really intending to send that message instead of just performing a denial of service attack. It makes denial of service attacks harder by requiring the sender to perform a mathematical…

I'm writing a system where a client needs to show via proof of work that it's really intending to consume CPU resources on the server, and not just bombing the server with denial of service queries. At first, I considered hashcash-style proof of…