The implosion of FTX, once a darling of the crypto industry with a $32 billion valuation as of January, has spurred investigations by the U.S. Justice Department, the Securities and Exchange Commission (SEC) and Commodity Futures Trading Commission (CFTC), a source with knowledge of the investigations told Reuters.

French central bank Governor Francois Villeroy de Galhau in a speech in Tokyo called for a global regulatory response to financial uncertainty caused by the crypto market.

"Let me stress that this uncertainty is why we need to regulate strongly and quickly crypto assets internationally," he said. "The last episodes show us that we cannot allow for a second 'crypto winter' to still add to uncertainty and financial instability."