Sound money is existential. It is a concept expounded and defined by Aristotle and that concept remains valid today. There is only one definition of sound money just as there is only one defn of Pythagoras Theorum.

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"Who gets Access" is not the same question as "what is sound money". There is a cost to decentralised security. Its one of the iron cast tradeoffs. If you want relatively low cost then lower your security.