Based on our record, OriginStamp seems to be more popular. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
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: almost 3 years ago
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