The problem here is that the ledger is public - and there exists few wholesalers who want their customers to learn who their suppliers are. So the ledger must

The problem here is that the ledger is public - and there exists few wholesalers who want their customers to learn who their suppliers are. So the ledger must by design, anonymise each entity involved. If you anonymise each entity, then every entity is Sybil. You have no more confidence in anything than you would've had pre-"blockchain".