Unfortunately, one of the 'killer apps' for crypto is extortion. It's going to change the world and not for the better. The hard part of extortion has always been getting paid. It's always involved exposure ("meet me there with a bag of money") or been subject to limitations (wire transfer clawbacks, cash withdrawal limits, etc), until now. Right now anyone in the world can fill an insulin syringe with cyanide soluti…
But how will such a criminal make Coca cola trust that it's him and not his impostor asking for money? And how will he make Coca cola trust that he will actually stop doing it?
2) Do whatever you're planning to do.
3) Transmit another message to the company you're blackmailing in which you reveal the message that matches the original SHA1 hash.