Gift card having coin reactive ink and other tamperproof properties

A method for generating a physical gift card with tamperproof properties, the method comprising:

• receiving a paper material for generating a physical gift card;
• treating a first portion of the gift card with one or more chemicals to cause visible indicators of attempted tampering thereon;
• printing a first identifier in permanent and visible ink on the treated first portion of the paper material;
• printing a second identifier in a matrix of ink dots on a second portion of the gift card that, as printed, obscure the second identifier, wherein the matrix comprises reactive ink dots and other non-reactive ink dots that, as printed, have a same visible appearance, wherein the second identifier is represented by the reactive ink dots, wherein the reactive ink dots are configured to have a different visible appearance from the non-reactive ink dots when the matrix is rubbed by a physical object, wherein rubbing the matrix with the physical object is configured to cause the reactive ink dots and the non-reactive ink dots to have the different physical appearances so that the second identifier becomes visible;
• and
• applying, in layers, one or more additional tamperproof properties to the first or second portions of the paper material, wherein the additional tamperproof properties are configured to cause attempts at tampering with the first or second identifiers to become visible on the paper material.