Mexico has an interesting similar concept, it's called UDI: (Unidades de Inversión, Investment Units), it's a currency tied to inflation, its a currency tied to inflation and it's used by financial entities to hedge against inflation.
I think the Pinochet dictatorship expanded the UF to be used in financial transactions like mortgages. Large loans such as for cars or college are also in UF.
It would be interesting to know whether Chile's UF served as inspiration to these brazilians.