The issue isn't one of trust in the general sense. Blockchain would "solve" the issue of transparency about when and who signed for what shipment where and when

The issue isn't one of trust in the general sense. Blockchain would "solve" the issue of transparency about when and who signed for what shipment where and when. The problem that can't be solved is that you have to completely trust that the blockchain reflects actually physical reality. A blockchain signature doesn't mean it is actually where it says it is. Even if you have some digital "fob" device, how do you know that it is on the right pallet of good. A digital signature can't prove anything in the real world. Blockchain is only useful in the pyramid scheme world of coins.