Downloadable cloud-based software for causing a point-of-sale system to cryptographically unlock promotional codes based on one or more items actually being purchased at the point of sale; Downloadable computer software and firmware for causing a point-of-sale system to cryptographically unlock promotional codes based on one or more items actually being purchased at the point of sale; Downloadable computer software platforms for causing a point-of-sale system to cryptographically unlock promo...