What you call proactive then refers to the quality or capacity of the systems to be prophylactic. Detecting failures before they occur and having adequate contingency plans is very important in this sense, although, in my opinion, it is not entirely easy to achieve. As for systems such as cryptocurrencies (that are reactive par excellence, as you well explained) it is even more difficult to be proactive, but you have to try, as you go; and based on reactions and proactions, everything will turn out in the best possible way. At least that's the way I understand it.
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