h(x) = 85951a5118cb7ae8d35d1d30ab0a7d4cd73ac8a7594249991b5dd05a089aaddb
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).