In late 2018, the companies behind the most widely traded cryptocurrency were struggling to maintain their access to the global banking system. Some of their backers turned to shadowy intermediaries, falsified documents and shell companies to get back in, documents show. One of those intermediaries, a major tether trader in China, was trying to “circumvent the banking system by providing fake sales invoices and contracts for each deposit and withdrawal,” Stephen Moore , one of the owners of Tether Holdings Ltd., said in an email viewed by The Wall Street Journal.

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