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These coins, made of pure gold, weigh one ounce each and have their private keys engraved on the back in 2D barcode, enabling the owners to access them by scanning using smartphones  – the images were pixelated for anyone who intend to try his luck.

This allowed for the technology of the Starbucks wallet to only need to faithfully display a custom 2D barcode.

Benjamin took the very simple 2D barcode and inverted the use case that most companies were using. 

This was a maverick move at the time as most technologists were laughing at the 2D barcode and the way it was used.

By allowing the register to scan the 2D barcode rather then the user scan a 2D barcode.