Sometimes we want to do prove more interesting things with a digital credential. For example, imagine that I want to join a cryptocurrency exchange that needs more complicated assurances about my identity. For example: it might require that I’m a US resident, but not a resident of New York State (which has its own regulations.) The site might also demand that I’m over the age of 25. (I am literally making these requirements up as I go.) I could satisfy the website on all these fronts using the digitally-signed driver’s license issued by my state’s DMV. This is a real thing! It consists of a signed and structured document full of all sorts of useful information: my home address, state of issue, eye color, birthplace, height, weight, hair color and gender. In this world, the non-anonymous solution is easy: I just hand over my digitally-signed license and the website verifies the properties it needs in the various fields.
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Mark F. Flint — this is the pseudonym of the head of System Sacom, a Japanese game developer responsible for titles including Dome, Soft de Hard na Monogatari, and Xenon 2: Megablast (Japanese release). His real name remains unclear. The book contains what appears to be his only substantial interview—and possibly the only interview with him under any name!