You still need to trust all the people in the production line (Farmer, Juicer, Seller and not to mention that transportation guys) that brought the bottle of juice to market to actually record things correctly into the used block-chain.
The trust required in the data entry "Link/Step" basically results in the use of a block-chain to be pointless, as trust is already a requirement in this particular chain of custody.
This is also why the block-chain only really works in Digital Only assets, as you link the asset it self in the block-chain itself.
You're right, but that isn't the problem being solved. That problem would be present in a centralized solution as well.
This solution allows the same benefit of having a MONOPOLIZED SOLUTION for tracking supply chain, without the negatives of Monopoly taking monopoly profits.
The blockchain makes it extraordinarily difficult to tamper with post facto. As the ledger is distributed with multiple parties and each block is hashed, it’s exponentially difficult to change later. This means that no centralized entity can cook the books if a situation arises.
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.
You still need to trust all the people in the production line (Farmer, Juicer, Seller and not to mention that transportation guys) that brought the bottle of juice to market to actually record things correctly into the used block-chain.
The trust required in the data entry "Link/Step" basically results in the use of a block-chain to be pointless, as trust is already a requirement in this particular chain of custody.
This is also why the block-chain only really works in Digital Only assets, as you link the asset it self in the block-chain itself.