[Cryptography] Best Internet crypto clock ?

[Tony Arcieri]

You could take a hash of some content, use that hash as a Bitcoin private
key, and send the associated public key 1 Satoshi. You could then prove you
calculated that hash at a given time by looking up the associated public
key in the block chain.

Here's something that does just that:

https://www.btproof.com/

-- 
Tony Arcieri
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