Flash BTC and USDT Sales: A Brief Overview Flash BTC and USDT are synthetic assets that operate on existing blockchain technology, allowing for rapid and efficient transactions. Here's a brief overview of Flash BTC and USDT sales: What are Flash BTC and USDT? Flash BTC: A clone version of Bitcoin (BTC) that operates on the existing blockchain, offering faster and cheaper transactions. Flash USDT: A clone version of Tether (USDT) that provides stability and rapid transactions, pegged to the US dollar.