![]() ![]() Take one of these timestamp verified, modification apparent screenshots from 3 weeks ago.Assume also that you can differentiate an actual screenshot from one that came out of a graphics editing program like Photoshop. ![]() Assume that there is a way to verify specifically when a screenshot was taken, despite modification.(Some examples would be the current head of the Bitcoin blockchain, the last closing price of a well known stock exchange, or the score of several recent sporting events for instance.)Ĭan I prove that PART OF the screenshot wasn't created before a given point in time? Include as part of the image some public data that didn't exist before that point in time, but is easy to verify later.The blocks include hashes (directly or indirectly) of all data on the chain that came before it, including your data.Ĭan I prove that a file (screenshot or otherwise) was generated or modified on or after a particular timestamp? Adding this data to a blockchain (similar to what bitcoin uses) would be a good example of such a data store if the blockchain is public and frequently appended to with a sufficiently powerful network of hashing (aka "miner") nodes. Add a copy or secure hash of your file to either a trusted third party's tamper evident publicly visible data store for later verification.I added a related followup question:Ĭan I prove that a file (screenshot or otherwise) was generated on or before a particular timestamp? I think parts 1 & 2 have been mostly answered above, but I think this will link them together. I think there are 3 parts to this question, and I think I can reasonably answer all three. However, if you go that way I would strongly recommend to check the Law StackExchange website before engaging yourself into anything. For instance I've read about such procedure being used when someone wants to keep a proof of the existence of a security flaw still valid even once the flaw itself has been corrected. By being present during the screenshot, they will be in measure to vouch the date and the conditions when it has been taken. Be sure to check beforehand that this service does not offer any possibility to modify the picture without altering the upload date!įor higher importance issues, you will have to contact a bailiff or a notary. If you want to prove to others that you took the screenshot on a specific date and not later, you will not be able to do it yourself, you will have to rely on some common trusted third party.įor low importance issues, this can be accomplished by simply posting the image on some well known public service where the date when the image has been posted will be mentioned. ![]()
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