Bitcoin (BTC), as a cryptoasset, is tethered to tether (USDT) tightly. Ever since becoming tradable in 2015, USDT has come to occupy an increasingly important part of the bitcoin and wider cryptocurrency ecosystem.
Now, USDT is the third-biggest token by market capitalization, and by virtue of being pegged 1:1 to the US dollar, it has long provided an on-ramp and