But that's the point blockchain is missing. You don't need to tamper with the data in the ledger because there is no way to put a carrot in it, how would you prove that the carrot in the juice is the same carrot picked? Technology isn't going to solve for that without some magical way to identity specific carrots (or beef, or whatever) that have been transformed into something else... or even just from another carrot in the next box. Blockchain is interesting but trust is still required in the system, and in many cases it is in fact blind trust.