Nice, but a little scary. I still think we should not have had off-the-shelf bots readily available until after time warp is fixed. I worry this may create much risk for the chain.
What "chain branching" issue are you referring to?
It is what you name it "undeniable" one, but there is nothing special except using rand() in nonce selection.
Your map filter is not exactly what I expected to see, but it is short and sweet. I like it. My map selection slows down map generation quite a bit, relatively speaking. I might hybridize the two and see what happens.
It's seems that this bot will end it's life cycle pretty soon, but this is like first version I made and it could be easily improved to compete with current generation of bots.
Likely this sort of architecture and approach both will not last much longer, for various reasons.