Timestamped Signature

Another project here. Let's says I have a string X (a random hash value) that I want saved and time stamped on the ether blockchain. I know I can issue a transaction T with X as a payload in order to publish that hash and hence prove that this hash value existed at the time of T confirms. However I still need to send coins between addresses that may or may not be useful. Ideally, we would also make it simple for people to verify that X is on the blockchain somewhere, ... how do we go about that? Is there a smart contract or a feature built for that purpose? How to keep it simple?
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