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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
To a certain extent I answered that with my first reply above.
Yes, you could reflash the board and find out the serial number - but then you'd have to create your own software that faked your device and sent out the same serial number. I imagine that's a step too far for most people, especially if you stored some encryption key in your software.