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jimrandomh comments on Harry Potter and the Methods of Rationality discussion thread - Less Wrong
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For "Harry Potter and the Methods of Rationality", I'd like to make predictions that can be eventually verified publicly in time, but won't tempt the author to change things to prevent it from coming true (as is the usual way of serial writers on the Internet). I'm therefore encrypting my prediction with the md5 hash function, so that afterwards it can be verified. (One difficulty is that I have the power to edit this comment; is there a way to make it obvious if I've done so, or store it in a less editable space?) Anyway, here goes:
July 16 (after Chapter 31): 28f9e3b2165344763c35514b473cb347
You can have a third party create a cryptographically signed timestamp for you. For example, secure-timestamp.org will do this. This can only be falsified by getting the timestamping server's private key or breaking its crypto algorithm. For things more important than Harry Potter predictions, you can have multiple third parties timestamp them for you, in which case falsification requires stealing all of their private keys.