How MasterWhats Used GraphRAG to Untangle Brazil’s Biggest Banking Fraud
A knowledge-graph investigation tool built on Nosana's decentralized compute network, born inside a small Brazilian recommendation-tech company.
A scandal too big to read
In November 2025, Brazil's Central Bank ordered the extrajudicial liquidation of Banco Master, a mid-sized lender that had grown explosively by selling roughly R$50 billion in bank deposit certificates (CDBs) — instruments backed by the government's deposit guarantee fund, but themselves propped up by illiquid, hard-to-value assets like court-ordered payment rights (precatórios) and stakes in struggling companies. Days later its controller, banker Daniel Vorcaro, was arrested on money-laundering charges. Brazilian press quickly began calling it the largest banking fraud in the country's history.
Daniel Vorcaro (source: wikipedia
What made the case explode beyond a financial story, though, wasn't the accounting. It was the release of leaked message threads — later partially unsealed by the Federal Police and reported on by outlets like Aos Fatos...
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