Investors in the Tether stablecoin have withdrawn $7 billion from the currency since it began falling and then regained its dollar peg, Yahoo writes.

Tether’s circulation fell from $83 billion last week to about $76 billion on Tuesday.

The nearly $7 billion decline in the currency’s value was attributed to investors remaining cautious about the token’s future amid calls for more transparency on the specific assets that back the largest stablecoin by market capitalization.

“We withdrew $7 billion in 48 hours without blinking an eye. How many institutions can do the same? We can keep going if the market wants us to, we have the liquidity to handle large redemptions and pay 1 to 1. Yes, Tether is fully secured,” Tether CTO Paolo Ardoino said on Twitter.

Recall that the stablecoin shook up the market when it briefly lost its peg to the U.S. dollar last Thursday.

According to a statement from the stablecoin’s CTO, it has billions of dollars in reserves, including U.S. government debt and corporate bonds, to help process transactions and customer withdrawals. However, details about these corporate bonds, such as the identities of the issuers, have not yet been disclosed. And Tether is also reluctant to disclose details about its government debt holdings.

Tether said Thursday that it has increased its Treasury holdings, which now account for 52% of its assets, and expects to increase that amount but is reducing its holdings of commercial debt securities. The announcement of these assets follows last year’s settlement of a lawsuit involving the New York state attorney general, who alleged that Tether was not always fully backed by U.S. dollars.

The recent volatility of the Tether market has caught the attention of Treasury Secretary Janet Yellen, who has called for increased oversight of stablecoins and warned that the rampant proliferation of these tokens could lead to a financial market upheaval.