As an export-import agent who usually uses LC (letter of credit) as a payment instrument & in my opinion LC is the safest instrument. If bitcoin is legal in the country and to encourage exporters and importers to make transactions using bitcoin, then you can offer surveyor services both for quantity and quality as well as the validity of import and export documents. And you can offer realtime video services when loading is done. You can also do the validity of data exporters and importers verification services in your country.