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A Bitcointalk user called "rekcahxfb" claims he is the hacker that broke into the exchange Bitfinex and stole 119,756 BTC (currently worth around £53million / $70million)
In his post, he promises that he has signed a raw transaction that will transfer 1000 BTC to one address left in the comments by other users if he gets arrested, blackmailed or murdered.
Check out his "proof" here: