Itaú Unibanco, Brazil’s largest private lender, has formally registered its cryptocurrency brokerage and custody operations with the Banco Central do Brasil (BCB), the country’s central bank, bringing the country’s biggest bank into formal compliance with the virtual-asset rules that took effect at the start of October. The bank said in an official notice dated Oct. 27 that the filing covers the intermediation and custody of cryptoassets, activities the regulation treats as equivalent to the “corretora,” or broker, category.