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テザーはusdt発行時に74%しか担保していない

The USDT stablecoin is only about 74 percent backed
by fiat equivalents as of April 30, says its issuer’s general counsel.

Tether, the company behind USDT, holds about $2.1 billion in cash
and short-term securities, wrote its general counsel Stuart Hoegner
in an affidavit Tuesday. Hoegner is also general counsel to Bitfinex,
a crypto exchange which shares executives and has overlapping owners with Tether.

The two companies are at the heart of allegations
by the New York Attorney General, who says Bitfinex borrowed
more than $600 million from Tether after losing as much as
$850 million to a currency converter.

https://www.coindesk.com/tether-lawyer-confirms-stablecoin-74-percent-backed-by-cash-and-equivalents