I don't think bitcoin is an electronic system, bitcoin is software and to be an electronic system should involve hardware. And you can think "But bitcoin user miners", but you can run the software without having miners.

For me an electronic system is a piece of hardware that works with electricity, for example, a walkman, a microwave, a television, etc... But I don't see bitcoin as an electronic system. The bitcoin environment has some electronic gadgets like miners or hardware wallets, but they are just add-ons, bitcoin can run on a PC as a simple piece of software.