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Puzzlehunt 2014

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Mersenne Tree

h(x) = 859034ab1db78bfe2ecce30a58187d6c8e756a885d660ea53c0ee3adc42f10cc


author: unknown

h(x) looks like a cryptographic hash, and refreshing the page shows it changes every 5s. We find that the SHA256 hash of the unix time (floored by 5 seconds) gives us the same hash. Thus the answer is the current unix time (and values within ± a minute are accepted).