A proof of work system is based on a mathematical problem that is moderate hard to solve but easy to verify.

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A proof-of-work random number generation system for Pokémon [closed]

(The original question that was here was considered too confusing, unclear, and rambling. You can still view it in the edit history, but the content is no longer useful by itself, and cannot be ...
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Is it safe to use RSA as a proof-of-work system?

Suppose I devised the following challenge-response proof-of-work system: A server generates a 2048-bit RSA modulus, and uses the "public" exponent (usually 65537) to sign a random nonce a fixed ...
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Proof of work for standard computers

I'm interested in a proof-of-work system that works well on standard computers without using the GPU. Properties the system should have: Seed based proof-of-work. There is no distinguished ...
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Proof of work scheme with one and only one correct answer

I need a problem that has one and only one solution, such that the solution is hard to find but easy to verify. I need to be able to generate the problem deterministically from a random seed. So ...
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What challenge should I use in a challenge-response proof-of-work?

In order to guard against denial-of-service attacks, I want to require clients to do some work (more work than the server does fulfilling the request) before talking to them. Client connects Server ...