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https://hackernoon.com/docproof-lets-you-prove-a-file-existedwithout-uploading-the-file.
There's a problem that
s been bugging me for a while. How do you prove a document existed at a specific point in time—without handing it over to someone
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Document verification can be difficult or impossible without trusting a third party with your files. Daniel G. has developed a way to prove a document existed at a specific point in time. The proof is created on the blockchain using a cryptographic fingerprint. The document itself never leaves your device and the hash reveals nothing about the content.