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I have been noticing more and more factom.org transactions at coinsecrets.com. factom seems to be the largest player in "hashed data storage" on the blockchain.
I am guessing that their BTC address (or one of them anyway) is this:
1FactomGnNFTsTVx8jiGjcLKDpyL65GDsH
Checking that address at blockchain.info yields a lot of interesting looking transactions, most of them for $0.12.
Hey, just reporting a curiosity here...