I love bad random number generators. Thank you Ethereum for giving us several entire new classes of the species!https://blog.positive.com/predicting-random-numbers-in-ethereum-smart-contracts-e5358c6b8620 …
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isn't the hash in question also dependent on the transactions recorded in the block itself, though?
Yes, that's the point. So making any change there requires re-mining the block.
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Couldn't you find a block, then wait until you want to affect an RNG, then accept transactions (or add your own) such that the hash is what you want it to be, before submitting it?
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No, because accepting transactions would mean the new block hash isn't valid (below the target) any more. Once you "find" a block you're committed to its contents.
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