If you don’t know what I’m talking about it’s this [here](https://community.spotify.com/t5/Subscriptions/QR-Codes-for-tattoo/td-p/4693922) People can draw them on paper and they still work. They seem to work well and are very simplistic. And there are over 50 millions songs on Spotify, and infinite playlists. How does this work?
In: Technology
There are over 20 lines of varying sizes in one of those. You can arrange 20 things in over 2 quintillion ways (2 followed by 18 zeroes).
Spotify has a long way to go before they run out of codes. If they do, they can just add another line in the code, and now they have 3 more quintillion codes.
Edit: yes I was too lazy to count the actual number of lines.
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