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Proof.ink's service is pretty straightforward. If you have a document of which you want to know with 100% certainty that it's contents has not been changed, tampered with or altered in any form, use Proof.ink.

Proof.ink works by fingerprinting your file (no matter how big), without the need to upload it, inside your browser.

The whale sprays at random intervals, but through SteemWhale.io you can donate some Steem (virtual currency from the Steem blockchain) and get an instant spray as a reward.

It is fascinating to donate crypto and only seconds later see a 350 liter water burst shoot up to 8 meters in the sky, all visible on the livestream (20 seconds delay!).