The USDC latest attestation report is here. These reports, which are published by independent accounting firm Grant Thornton LLP, are created to track the current amount of US dollar reserves backing USDC. The newest report states that as of October 30, 2020 at 11:59 PM Pacific Time (“PT”):
USD Coin (“USDC”) issued and outstanding = 3,002,021,340 USDC
US Dollars held in custody accounts = $3,004,921,958
At the time of the report's publication, issued and outstanding USDC tokens do not exceed the balance of the US Dollars held in custody accounts
You can read the full report here for more details. We recommend you check in with us every month, as Grant Thornton LLP provides USDC attestation reports on a monthly basis. You may also download all past USDC attestation reports here.