If you were directed to download software to "send" Bitcoin or USDT that appears instantly but disappears later, you are likely encountering a scam.
: Scammers use "flashing" tools to send invalid, unconfirmed transactions that temporarily show in a recipient's wallet balance but never finalize and eventually vanish.
If you are looking for the official ecosystem for the cryptocurrency, use only verified platforms. flash-coin/flashcore - GitHub
