4 points
If all that you’re interested in is the timestamp then you don’t even really need to have a signature at all - just the hash of the image is sufficient to prove when it was taken. The signature is only important if you care about trying to establish who took the picture, which in the case of this hospital explosion is not as important.
1 point
How is a hash of the image supposed to prove anything about when it was created?
3 points
You post it publicly somewhere that has a timestamp. A blockchain would be best because it can’t be tampered with.
1 point
1 point
That proves it existed at a specific time in the past, not that it didn’t exist before that. What’s stopping a hash of the Mona Lisa on a block chain with today’s date?
