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A comment on Hidden surprises in the Bitcoin blockchain and how they are stored (2014). Parent comment

Re:Hidden surprises in the Bitcoin blockchain and how they a... by cassetti on Tuesday August 01, 2017 @11:57AM (#14902098)
https://proofofexistence.com/
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Re:Hidden surprises in the Bitcoin blockchain and how they a... by amingilani on Tuesday August 01, 2017 @01:59PM (#14903468)
Or my favorite: stamp.io

If you have an Estonian ID, Stamp.io lets you sign it too!

Full disclosure: I know the Stamp.io team, and they're awesome.

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