Tether (USDT) is a stable coin, meaning that its value doesn't change over time. Every Tether is pegged to a real-world currency like the US dollar, euro, and the Japanese yen. USDT is an altcoin using the OMNI-layer protocol with a 2.5 billion total coin supply. The token was launched by Jean-Louis van der Velde in 2014 under the name RealCoin, but was later rebranded. The cryptocurrency carried out a private presale, using the raised funds to back the token as collateral. The venture has offices both in China and the US.