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Provable timestamps for your content, checkout the video for a quick explanation

Create your own (free and easy!), pick one of the three input methods

Arbitrary text or hash in hexadecimal (e.g., "Crypto Stamp is born"):
Contents of a URL (e.g., "http://i.imgur.com/MbaQr.png"). Note that this only works for content that does not change, e.g., an image or pdf hosted online:
Contents of a file, hash computed client-side while only hash uploaded to server:
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