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285 points pavel_lishin | 1 comments | | HN request time: 0s | source
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29athrowaway ◴[] No.43552998[source]
You may also be interested in: https://en.wikipedia.org/wiki/EURion_constellation
replies(1): >>43553858 #
1. tgsovlerkhgsel ◴[] No.43553858[source]
And the lesser known, newer, invisible, digital watermark based version of it. Unfortunately very little information is available about that one. http://www.cl.cam.ac.uk/users/sjm217/projects/currency/