CORRECTION APPENDED: On Sept. 19, a court in London approved the extradition of Caio Marchesani, owner of U.K. fintech Trans-Fast Remittance, to Belgium to face one charge of having "knowingly and intentionally" involved himself in a transnational criminal organization. Belgian prosecutors claim that since 2019, alleged "dark banker" Marchesani, a 38-year-old Italian born in Brazil, managed stacks of illicit cash and controlled 14 digital wallets from an apartment in London, where they say he connected with other alleged underground bankers in the United Arab Emirates and Latin America who laundered hundreds of millions of euros for cocaine traffickers. Four days...