Which product innovation helped drive the recent vinyl record resurgence by adding digital value to the physical format?

The music industry has seen a fascinating trend in recent years with the unexpected comeback of vinyl records. Once considered obsolete technology, vinyl sales have been growing consistently for over a decade, even as streaming dominates the market. This trivia question explores an interesting product design decision that helped fuel this revival and attract a new generation of collectors.

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Digital download codes included with vinyl purchases
Built-in Bluetooth transmitters in new vinyl pressings
QR codes embedded in record grooves for AR experiences
Vinyl records that change color based on surrounding temperature