Pseudonymous Solana developer cavemanloverboy introduced SIMD-547 on Saturday, proposing a new transaction base fee that would be burned to reduce SOL inflation. Some estimates say the change could lift daily SOL burn from 648 SOL to 10,800–64,800 SOL and potentially turn issuance deflationary if activity rises about 25x. The idea has support from Solana co-founder Anatoly Yakovenko, while SOL Strategies CEO Michael Hubbard warns higher costs could hurt emerging institutional and AI-related use cases.

Avalanche said FIFA World Cup-related ticketing activity on its network surpassed 60,000 transactions over the last few days, after fans used “Right to Buy” (RTB) digital assets through FIFA Connect. Arielle Pennington, Avalanche’s SVP of Growth, said transaction volume reached up to 24x normal levels while active addresses rose about 10x, even before the tournament began. She argued the episode shows blockchain can run in the background of consumer apps, while regulators have raised concerns and probes have been launched into FIFA’s ticketing practices.

Brazil's central bank introduced Normative Instruction No. 739 on Friday, requiring VASPs to submit CVM-registered independent "reasonable assurance" audits to obtain operating licenses. At the 8th Mexico-EU Summit, Mexico and the European Commission said they are exploring joint steps against crypto money laundering, alongside a trade agreement that includes a €5 billion investment in Mexico. Separately, Secretary of State Marco Rubio designated Brazil's CV and PCC as SDGTs on Wednesday and said he intends to add FTO designations starting June 5.

Brazil's Central Bank issued Normative Instruction No. 739 on Friday, adding a new condition for virtual asset service providers (VASPs) seeking authorization to operate in the country. Applicants must now submit an independent "reasonable assurance" audit prepared by a third-party entity registered with Brazil's securities regulator, alongside checks tied to AML/CTF controls and reporting readiness.

The U.S. government, under the Trump administration, has designated Brazil's Comando Vermelho (CV) and Primeiro Comando da Capital (PCC) as Specially Designated Global Terrorists, with Foreign Terrorist Organization status planned to begin on June 5. The move cites their alleged drug-trafficking operations and claims they used cryptocurrency—including bitcoin mining—to launder proceeds, alongside reports of ASIC seizures during an operation in Rio de Janeiro.

Socket investigators say a supply-chain campaign dubbed "Trapdoor" used malicious packages on npm, PyPI, and Crates.io to target crypto developers, aiming to steal wallet keys and other secrets. The firm reported the activity began with waves of package releases on May 22 and continued with updates over the following weekend, affecting 34 packages across 384 versions, some of which remained available.

Reps. Nick Begich and Jared Golden introduced the American Reserve Modernization Act of 2026 (ARMA), which would create a U.S. Strategic Bitcoin Reserve and require it to be maintained for at least 20 years. The bill would authorize the Treasury to acquire up to 200,000 BTC per year for five years—targeting 1 million BTC—using a budget-neutral approach tied to gold revaluation and stricter custody standards.

In Q1 2026, Nu Holdings said Nubank reached break-even in Mexico for the first time since entering in 2019, while reporting it had grown to 15 million customers and become the market's third-largest financial institution. Revolut, which began operating in Mexico in January, said it scaled investment to $167 million and by end of March had more than 290,000 registrations and $218 million in deposits.

Brazil’s Central Bank, through its Copas committee, imposed a two-year ban on Banco Topazio’s foreign purchases and sales of cryptocurrency assets and issued a $3.2 million fine. The decision cites compliance failures between October 2020 and September 2021, when crypto trades totaling $1.7 billion were executed involving 15 legal entities without reporting atypical operations. Regulators said these transactions represented 63% of the bank’s foreign exchange volume during the period and flagged deficiencies tied to AML/CFT risk controls.