h(x) = 102cb51531c0b6b6c9b6db31648ff8b75696c07e4daa8a5c3a3a332a05ed9166
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).