The Brazilian central bank's digital currency project, Drex, is undergoing a significant strategic shift. According to local media reports, the bank has decided to jettison the decentralized elements of the CBDC and move to a centralized architecture in order to deliver a working solution by 2026. The primary reason cited is the immaturity of privacy solutions tested during the pilot phases.
Two-Phase Rollout: Blockchain Deferred
Fabio Araujo, coordinator of the Drex project at the central bank, confirmed the change. The new proposal will be delivered in two phases: the first phase is expected to launch in 2026 without any decentralized aspect; the second phase will continue to implement and mature blockchain technologies. This means many of the programmable use cases tested during the pilot — such as tokenized assets and smart contracts — will not be available initially, given the lack of programmability in the centralized architecture.
Furthermore, there is no guarantee that the project will continue to use Hyperledger Besu, the open-source, Ethereum-compatible blockchain platform selected for Drex in 2023. Araujo stated that while the privacy solutions examined for the now-abandoned decentralized version were promising, they still need significant improvement to become part of Brazil’s financial security infrastructure. “We found good privacy solutions, but apparently they are not enough. We need to put this to the test,” he told Valor Economico.
Privacy Remains the Achilles' Heel
Privacy has been a roadblock for Drex’s decentralized ambitions since last year, when the central bank announced a postponement of the pilot due to inefficiencies in the privacy solutions presented. Those solutions lacked the functionality to offer bank-transaction-level secrecy and verifiability. The centralized version effectively sidesteps these issues by adopting a traditional, permissioned ledger.
Despite the pivot, the centralized Drex will deliver a lien reconciliation solution, which will unlock credit operations using various types of collateral. The specific tools needed to implement this functionality have not yet been announced. Observers note that the decision reflects a pragmatic trade-off: speed and regulatory compliance over decentralization. Brazil’s approach may serve as a blueprint for other emerging economies racing to launch CBDCs while grappling with privacy and scalability challenges.
Read more: Original report on Bitcoin.com