Cryptocurrency exchange Binance has replaced its Binance USD (BUSD) holdings in its Secure Asset Fund for Users (SAFU) with TrueUSD (TUSD) and Tether (USDT) in response to Paxos’ move to stop minting new BUSD. SAFU is an emergency insurance fund established by Binance to protect users’ funds in case of security breaches or other unforeseen events.