Signatures and labels in a blockchain derived from digital images

A method for product security, the method comprises the following steps:

• I) generating at least one security label using a method for generating at least one security label and physically connecting the security label with a product, wherein the identifier information is information about the product;
• II) generating at least one verification number, wherein the generating of the verification number comprises converting color values of the plurality of colored pixels of the second digital image to a secondary color space having at least four primary colors, determining a number of respectively colored pixels for each primary color of the secondary color space and generating the verification number by converting the determined number of respectively colored pixels for each primary color of the secondary color space to numerals;
• III) applying the verification number on the substrate;
• IV) adding the second digital image as a block and the verification number as a hash to a blockchain of security labels of a supply chain;
• wherein the method for generating at least one security label using a method for generating at least one security label comprises:
• i) generating a first digital image comprising a plurality of colored pixels by printing a printer job with a printer control setting to generate a printout by using the printing device and scanning the printout using a scanning device thereby generating a digital fingerprint;
• ii) providing a binary code of identifier information;
• iii) mapping the identifier information with the digital fingerprint by determining a binary code of the digital fingerprint and adding the binary code of the identifier information to a color code of the first digital image;
• iv generating a second digital image having a plurality of colored pixels different from the first digital image, by transferring the added binary codes into a color code of the second digital image;
• v) printing the second digital image on a substrate thereby generating the security label.