proof.ink
Proven immutable data
Screenshots
Hunter's comment
@roelandp has been up to it again, literally from a hack weekend i think the last few days has come up with this sweet tool to add to our every growing library of cool stuff running on the blockchain
File hashes stored on the Steem blockchain, * data: documents, files, images, music, zip, software, 1010101000 - 24hr weekend endeavour using all tools out there: - Steem.io Developer SDK's - Undraw.co - Bootstrap, Cryptojs and Filehashing, Filesaver.js - Stackoverflow.com
if you 100% need to prove that a file has not been tampered with this might be a tool to check out, now with blockchain immutablity from our lovely chain! :)
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