The vendor, who would see that I'd sent it, would be confident that they could then send the product to me, and then when I received it, at least two of the three people engaged in the transaction — vendor, buyer, site administrator — would have to sign the transaction off with a unique digital signature, and then the money would be transferred.
El proveedor que vería que yo lo había enviado entonces podría estar seguro de enviarme el producto, y luego, al recibirlo, al menos de 2-3 personas involucradas en la transacción vendedor, comprador, administrador del sitio, tendría que firmar la transacción con una firma digital única, para al final transferir el dinero.