That would be an SHA-1 collision which has never been reported and would break lots of encryption in common use. You guys are worrying about the wrong thing. A

That would be an SHA-1 collision which has never been reported and would break lots of encryption in common use. You guys are worrying about the wrong thing. Any hash considered secure will have zero collisions, at least in your light cone for trillions of years. If current hashes are shown to have weaknesses they will be deprecated, probably before even a single collision takes place.