I don't see the signed message in the video, I think this is just another bullshitty story.
Why would he come out now and not earlier? I don't get it why now?
now we are getting closer...
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"He doesnt want to cash in on his bitcoin fortune, but plans to spend the money on research (and only slowly, as not to push down the bitcoin price), he says."Just spent 1 Dollar and you made the best proof. DO IT!
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"In his blog post Mr Wright says that he does indeed control the key for block 9"Block 9 great. Now do it on Block 1 please.
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"He also says he cant send any bitcoin because they are now owned by a trust. And he rejected the idea of having The Economist send him another text to sign as proof that he actually possesses these private keys, rather than simply being the first to publish a proof which was generated at some point in the past by somebody else."-----------
All this computing power, says Mr Wright, is used to test his ideas about how to improve bitcoin.Something good at least
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In response Mr Wright says that, although he was the principal author of the white paper, he had extensive help from his friend Dave Kleiman, an American computer-forensics expert who died in 2013.extensive help = 98% of the work i guess
And then, as mentioned before, there is always the possibility that he could have obtained the keys from someone else, perhaps Hal Finney or Dave Kleiman. Since both are dead, they cannot be asked.