If you're interested in the implications of using "Global Consensus" systems for cryptocurrencies that are intended to be usable as a form of money, this article and the earlier https://perry.kundert.ca/range/finance/holochain-consistency... article might be worth reading.

TL;DR: Not only is "Global Consensus" not required to construct a valid global ledger, its inherent drawbacks actually make systems based on it quite bad at serving the purposes that "money" is usually intended to serve. Like, not starving to death...