Spotify Scanner Code

[Sear Sommerfeldt]

Headto spotifycodes.com, paste the Spotify URI or URL in the box and click GET SPOTIFY CODE. You can even include an unreleased track if you know the Spotify URI. From here you can customize the background and bar colour of your Spotify Code, before downloading it as a JPEG, SVG or PNG.

To scan a Spotify Code on the Spotify mobile or tablet app, tap Search at the bottom, tap the camera icon in the upper right corner, then simply point your camera at the Spotify Code or Select from photos to import a screenshot.

The URI has a lot more information (62^22) in it than the code. How would you map the URI to the barcode? It seems like you can't simply encode the URI directly. For more background, see my "answer" to this question:

Using Burp Suite, when scanning a code through Spotify the app sends a request to Spotify's API: -id/id/[CODE]?format=json where [CODE] is the media reference that you were looking for. This request can be made through python but only with the [TOKEN] that was generated through the app as this is the only way to get the correct scope. The app token expires in about half an hour.

The reference contains the integers 0-9 compared to the gray table of 0-7 implying that an algorithm using normal binary has been used. The patent talks about using a convolutional code and then the Viterbi algorithm for error correction, so this may be the output from that. Something that is impossible to recreate whithout the states I believe. However I'd be interested if you can interpret the patent any better.

I also discovered through the proxy that you can use the domain to fetch the album art of a track above the code. This suggests a closer integration of Spotify's API and this scannables url than previously thought. As it not only stores the URIs and their codes but can also validate URIs and return updated album art.

Very interesting discussion. Always been attracted to barcodes so I had to take a look. I did some analysis of the barcodes alone (didn't access the API for the media refs) and think I have the basic encoding process figured out. However, based on the two examples above, I'm not convinced I have the mapping from media ref to 37-bit vector correct (i.e. it works in case 2 but not case 1). At any rate, if you have a few more pairs, that last part should be simple to work out. Let me know.

It turns out that the basic process outlined in the patent is correct, but lacking in details. I'll summarize below using the example above. I actually analyzed this in reverse which is why I think the code description is basically correct except for step (1), i.e. I generated 45 barcodes and all of them matched had this code.

UPDATE: I've added a barcode (levels) decoder (assuming no errors) and an alternate encoder that follows the description above rather than the equivalent linear algebra method. Hopefully that is a bit more clear.

The linear algebra method defines the linear transformation (spotify_generator) and mask to map the 37 bit input into the 60 bit convolutionally encoded data. The mask is result of the 8-bit inverted CRC being convolutionally encoded. The spotify_generator is a 37x60 matrix that implements the product of generators for the CRC (a 37x45 matrix) and convolutional codes (a 45x60 matrix). You can create the generator matrix from an encoding function by applying the function to each row of an appropriate size generator matrix. For example, a CRC function that add 8 bits to each 37 bit data vector applied to each row of a 37x37 identity matrix.

The digital world is constantly innovating and evolving, offering efficient solutions to problems we didn't even know we had. One such intriguing innovation in the digital world is the Spotify QR Code.

A Spotify QR code, also known as a Spotify code, serves as a quick and efficient conduit between you and your favorite music. With a quick smartphone or tablet scan, you can instantly start enjoying a song, album, or playlist.

The particularity of a Spotify QR code lies in its exceptional blend of simplicity and functionality. Moored in the sea of codes that make up our digital landscape, the Spotify QR code stands out with its unique design, resembling an audio waveform, which is both visually attractive and symbolically fitting for a music streaming platform.

And just like that, the linked Spotify content will play immediately. It's worth noting that Spotify's inbuilt scanner isn't the only way to scan Spotify QR codes. Users can also use any standard QR code scanner app.

Any device with a camera and the Spotify app installed can scan a Spotify QR code. Alternatively, any device with a QR code scanning app can scan the Spotify code and then open the corresponding Spotify content in a web browser.

Spotify QR codes simplify your music sharing, enabling access to playlists with a quick scan. Whether you're a music lover, musician, or marketer, you can leverage these codes to enhance user interaction, promote music, or add creativity to marketing campaigns.

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