There’s a 50/50 chance that it could be the creator, but even I can’t confirm this. The reason I say so is because when puzzle #120 was solved, if RetiredCoder was the actual solver, you’d expect the creator to wait for the private keys to be revealed before funding the remaining addresses with 1000 BTC. Instead, without knowing who solved it or how it was solved, the creator immediately increased the prize to 1000 BTC.

Another suspicious point is that puzzles #66 and #130 were both solved in the same month. While this could be a coincidence, it still raises questions. The sad part is that we’ll probably never know the truth since the creator isn’t coming forward to address the criticism or clarify any of these doubts.