On July 29th, CoinMarketCap data showed that Tether's market value exceeded $4 billion, the highest level since its launch in 2015. In just a few weeks, the dollar-stabilized stable currency soared from $2.8 billion to $4 billion, mainly due to the recent large-scale issuance based on the Ethereum ERC-20 token. As early as June, Tether issued $500 million in tokens at Ethereum, which suddenly increased to $1.5 billion. The reason for the increase in demand is not obvious, but the price of cryptocurrency has risen in May and June. The trading volume of USTD has been far lower than Bitcoin and even Ethereum, and the recent unfiltered transaction volume has consistently exceeded Bitcoin. According to Trustnodes, a reasonable assumption is that this stable currency is the primary use for counterfeiting false transactions and for trading cleaning.