It was indeed a very nice puzzle for anybody having a bit of knowledge about the "internals".
I mean that although indeed it's a Bitcoin forum, far too many don't know what base64 is and also far too many don't know what to do with a list of binary digits.

So my advice is to make also puzzles for those with no IT background, or at least tell that those without a bit of IT background may "have difficulties"
Still, it was a nice one