The ledger ensures that the handing over of the "thing" can happen without trust in any intermediary. You still ultimately have to trust the counterparty to deliver what they promise.
Think of it like HTTPS. Nobody can sneak anything into the request, but the counterparty you're contacting could still be a fraud.
Think of it like HTTPS. Nobody can sneak anything into the request, but the counterparty you're contacting could still be a fraud.