I am actually working on the whitepaper right now. Which I will be submitting my patent idea very shortly. To secure my idea on https://originstamp.com. Source: about 2 years ago
P.S. You should use OriginStamp or something similar to put the hash of the cafe transaction ID (a hash of a hash, I suppose) on a blockchain and tell us about it so that you can later prove that you did have a specific target transaction in mind. Otherwise, you could unfairly "change your mind" about the target transaction later. Source: over 2 years ago
2) To prove that your video or photo were collected no later than a certain date, you can hash the file and then post it to a blockchain, such as BTC or BCH. This service does that for you. I or others could help you do the technical parts. It shouldn't be too hard. Source: over 2 years ago
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