I think that if the creator was to come here and give us hints, this would defeat the purpose of his creation which is to measure our cracking capabilities.
Can't really be giving out hints in an experiment like this one, we must check our own leads and see what comes out of it.
He succeeded in his idea.
Prize: 988.498 BTC (total), 31.998 BTC (won), 956.5 BTC (remaining)
His 956 BTC is relatively safe even if the whole world knows the ranges where the private keys are.
