Spanish crypto influencer Álvaro Romillo, known as CryptoSpain, was arrested Thursday and ordered held without bail on charges of orchestrating a $300 million fraud through Madeira Invest Club. Prosecutors allege Romillo defrauded approximately 3,000 investors of €260 million through a Ponzi scheme. A Singapore bank account containing €29 million linked to entities connected to Romillo raised flight risk concerns, prompting the detention order.

A Manhattan federal court declared a mistrial in the case against Anton and James Peraire-Bueno, two brothers accused of exploiting MEV-Boost software to extract $25 million from Ethereum in 12 seconds. The jury deadlocked after struggling to apply existing wire fraud and money laundering statutes to blockchain activity. Deliberations reportedly caused emotional distress among jurors, with some brought to tears.

The European Commission will present a proposal in December to establish a single regulatory authority overseeing cryptocurrency exchanges, stock markets, and clearing houses, similar to the U.S. Securities and Exchange Commission. The initiative aims to reduce fragmentation across national supervisors and streamline cross-border operations for financial firms across member states. One option under consideration involves expanding the European Securities and Markets Authority's mandate to cover major cross-border financial entities.

Electric Coin Co., the organization behind Zcash and its Zashi wallet, has released its fourth-quarter 2025 development roadmap. The plan prioritizes ephemeral address integration for swaps via NEAR Intents and hardware wallet enhancements for Keystone users. Zcash currently trades around $420, reflecting substantial growth from $50 in mid-September.

Spot Solana exchange-traded funds from Bitwise and Grayscale attracted approximately $200 million in combined net inflows during their first week of trading, excluding seed capital. Bitwise's BSOL led with $197 million in cumulative inflows since launching Tuesday, while Grayscale's GSOL recorded $2.2 million. The two funds now collectively hold over $500 million in assets.

A Bitcoin Improvement Proposal, BIP-444, calls for a temporary soft fork to restrict arbitrary data attached to transactions. The proposal emerged after Bitcoin Core's v30 update removed caps on OP_RETURN data limits. Proponents cite legal liability concerns for node operators, while critics warn the measure amounts to protocol-level censorship.

Video platform Rumble announced at the Plan ₿ Forum in Lugano that its 51 million monthly active users will gain access to cryptocurrency tipping in mid-December. The Rumble Wallet will support Bitcoin, USDT, and Tether Gold payments. Tether developed the feature and holds approximately 48% of Rumble following a $775 million investment in 2024.