By Tom Wilson and Elizabeth Howcroft LONDON (Reuters) -Binance has seen withdrawals of $1.9 billion in the last 24 hours, blockchain data firm Nansen said on Tuesday, as the world’s biggest crypto exchange said it had “temporarily paused” withdrawals of the USDC stablecoin. How crypto exchanges such as Binance and its now-bankrupt former rival FTX handle customer deposits is under close scrutiny from users and regulators. FTX’s founder Sam Bankman-Fried was charged by the U.S. Securities and Exchange Commission on Tuesday with defrauding investors. Binance, whose dominance of crypto was cement…