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0 sats \ 0 replies \ @joda 8 Jun \ parent \ on: Machine readable fonts instead of QR codes bitcoin
also there are letters and numbers that are visually ambiguous (1/l, 0/O, etc). In binary and with error correction it's easy.
QR can also be animated, allowing for a huge amount of data.
wish I could find a cool article I read a year or so back, but the wikipedia page is pretty interesting too:
https://en.wikipedia.org/wiki/QR_code