Hah, I just thought of a legit use for OMG BLOCKCHAIN.
I've idly wanted some sort of public timestamp assertion server for a while. Like https://tools.ietf.org/html/rfc3161 ... except I'd rather not rely on a trusted third party that might decide to just shut down at some point.
Piggy-backing on a Bitcoin-like blockchain (even Bitcoin itself) seems like a good solution.
I know Bitcoin transactions can carry comments, need to read up on whether they are covered by the transaction/block signature.
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