@jtruk @revisionparty
References:
- SpotCode (predecessor of ShotCode) spec: https://web.archive.org/web/20040803155556/http://www.highenergymagic.com/spotcode/symbols.html
- Another circular barcode from the SpotCode group with specs: https://anil.recoil.org/papers/2005-mc2r-bluespot.pdf
- Counting the example image on the Wikipedia page for ShotCode implies two rings of 24 sectors each which would make sense for 40 bits plus some sync and checksum
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