POW specification

Research
1

Hi!
Is there an actual exact POW specification in human readable format? Except the source code with a little comments.

2

The mathematical spec is at [0], while the C-code spec is at [1]

[0] https://github.com/tromp/cuckoo/blob/master/doc/mathspec
[1] https://github.com/tromp/cuckoo/blob/master/doc/spec

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3

Thank you. With the mathspec it becomes more clear. Except the SIPHASH key initialization from the header and nonce, and final solution hashing.

4

The above is the general, blockchain independent, C32 PoW specification.

That’s the Grin specific interface with the PoW.
In Grin, the siphash key K is computed as the blake2b hash of the pre-pow header (up to and including the nonce), and the final solution hash is the blake2b hash of the sequence of 42 32-bit cycle indices.

If you leave out the middle step of going from K to a 42-cycle, then it’s just like Bitcoin’s double hash:-)

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