The idea of a public ledger and distributed witness signatures is sound though, and that should be the basis of a government approved system of inter-reserve asset tracking.
Tiered systems for central bank digital currencies that allow complete tracking of all transactions are an active area of interest by central banks. For instance, the PBoC has filed over 80 patents on the subject. You can be sure that these systems don't attempt to solve BFT, don't use as much electricity, and don't protect the peasants from the abuses of the rulers.
[1] https://decrypt.co/resources/byzantine-fault-tolerance-what-...
Nakamoto consensus was the innovation, the major energy consumer, and not necessary for cryptographic data integrity like a CBDC or git repo needs.
https://m-cacm.acm.org/magazines/2019/8/238347-the-history-o...
A blockchain is just blocks of data linked together using hash functions to guarantee the authenticity of previous blocks. There's no mining, and only a tiny amount of electricity used.
You are either ill-informed and should educate yourself on the subject (blockchain != proof of work-based consensus) or willingly creating confusion by mixing up concepts.
Let's assume the first, shall we?
Maybe the summary is saying something completely different, in which case the use of 'blockchain' within it can still concern me and any other readers who are similarly wrongly informed.
Proof of work is the thing that uses the electricity. blockchains can use or not use proof of work.