Brazil's CBDC Drex Uses Zero-Knowledge Proofs to Shield User Transaction Data

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Brazil's Central Bank Digital Currency, Drex, is being engineered with privacy as a core design challenge rather than an add-on feature. Early pilot tests in 2023–2024 revealed that transactions on the Hyperledger Besu network were visible to all participating institutions, prompting authorities to launch a technical competition for privacy-preserving solutions. The leading approach uses Zero-Knowledge Proofs, which mathematically verify a transaction's validity without exposing amounts or participant identities to third parties on the ledger. A selective disclosure model ensures regulators can access specific records only via legal triggers such as court orders, aligning with Brazil's data protection law, the LGPD. Experts caution, however, that strong cryptography alone is insufficient, as smart contract vulnerabilities and metadata patterns could still compromise user privacy if implementation is not carefully hardened.

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