Verifying a product is disclosed. An image of a self-assembly (SA) pattern on a substrate from a scanner is received. The SA pattern has been initially created using a block copolymer (BCP) which has been annealed on the substrate. Data from the SA pattern is stored in a computer system. The SA pattern data is associated with the product. The SA pattern is an information carrying security mark having a set of features with corresponding locations within the information carrying security mark which uniquely identify the product.