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I am not aware of others featuring one apart from eos, are there?

The rules of bitcoin regulation (for example) are effectively constitution, despite it has not called like that, @conceptskip.

Hmm... interesting. Like a code is law constitution? I think the striking aspect of the EOS constitution, is that the human readable part is what counts, and the constitution can be changed, by vote, so there is a process in place which should prevent deadlock, frauds and bugs, we know so well from btc or eth