Brazil's central bank has published a rule that will require crypto firms to delay certain outbound transfers for as long as 24 hours when a single transaction, or a customer's combined daily transfers, exceeds $10,000 and is headed to a self-custody wallet or a virtual asset platform based outside Brazil. Resolution BCB No. 584/2026, published on August 7, amends a 2021 fraud-prevention framework for payment providers to explicitly cover crypto and stablecoins. Transfers that remain inside a regulated domestic exchange or move between accounts on the same platform are excluded, while smaller transfers may still be held if an exchange's risk controls flag them as suspicious. Firms must document any decision to release funds early and notify the customer, and institutions that fail to comply could face a longer hold period, a lower threshold, or limits on their ability to release funds before the review window ends. The measure takes effect on January 1, 2027, and the central bank said it is meant to create a review window rather than block transfers outright. The change lands in a market where crypto use is already substantial: Brazil ranked fifth in Chainalysis's 2025 Global Crypto Adoption Index and received $318.8 billion in crypto value between July 2024 and June 2025. That adoption has been driven in part by stablecoins and tokenized fixed-income products, with a report earlier this year showing a 56% year-over-year rise in adoption among users under 24 even as Brazil's broader economy remained relatively conventional. The market has also continued to attract global issuers, including Tether's $20 million investment in Mercado Bitcoin after USDT retreated from Europe following MiCA (European Union crypto rulebook) final transition deadline. Firms now have roughly five months to build systems that can monitor cumulative daily customer transfers rather than assess each transaction on its own.