How to check whether a stablecoin is really backed

You're holding USDT, USDC, or some newer stablecoin and want to know if the dollar sitting behind it is real. The peg only holds if the issuer can redeem every token for a dollar, on demand, at scale. Here's how to actually check.

What does a stablecoin issuer claim to hold?

Every major issuer publishes a reserve breakdown. Tether's Q1 2024 attestation claimed roughly $110 billion in reserves against $110 billion in liabilities, split across Treasury bills, repo, and other assets. Circle publishes monthly reports for USDC through Grant Thornton.

Cash and cash equivalents (usually the safest bucket)
Short-term Treasury bills (liquid, low risk)
Commercial paper (was a red flag for Tether in 2021-2022)
Secured loans, corporate bonds, or crypto assets (riskiest, hardest to value)

The mix matters more than the total. $1 billion in 90-day T-bills behaves nothing like $1 billion in loans to unnamed counterparties.

Attestation or audit: what's the difference?

This is the single most important distinction and issuers blur it constantly.

An attestation is a snapshot: an accounting firm confirms reserves matched liabilities on one specific date. It says nothing about the days before or after.
An audit tests internal controls, verifies processes over time, and follows GAAP or equivalent standards. It's far more expensive and far more revealing.

Tether has never published a full audit, only attestations from BDO Italia. Circle's monthly reports are also attestations, not audits, though Circle has pushed for more frequent disclosure. Neither issuer's reserves have gone through the multi-month scrutiny a real audit requires.

Ask: is this a point-in-time snapshot or a process review?
Check the accounting firm's name. A Big Four signature carries more weight than a boutique firm few have heard of.
Look for the words "audit" versus "attestation" or "agreed-upon procedures" in the actual PDF, not the press release.

Can you verify reserves yourself?

Partially. Some checks don't need to trust anyone's PDF.

On-chain supply vs. claimed backing: compare total tokens minted (public, on-chain) against the reserve figure the issuer reports for the same date.
Bank and custodian names: does the report name specific banks holding the cash, or just say "held with various institutions"?
CUSIP-level Treasury holdings: the most transparent issuers (like some newer entrants) list individual bond identifiers you can look up independently.
Redemption terms: read the terms of service. Can you actually redeem for dollars, or only trade on an exchange? Tether requires $100,000 minimums and KYC for direct redemption.

None of this replaces an audit, but it narrows the range of plausible deception.

What's the catch with "fully backed" claims?

"Fully backed" is a marketing phrase, not an accounting one. A stablecoin can be 1:1 backed by assets that are illiquid, mismarked, or legally entangled, and still say "fully backed" truthfully.

Reserves can be real but frozen, pledged as collateral elsewhere, or held in jurisdictions with weak legal recourse.
A reserve snapshot from March tells you nothing about April, especially during redemption runs when issuers sell assets fast and cheap.
Segregation matters: are reserves legally separate from the issuer's own balance sheet, or could creditors claim them in bankruptcy?

Terra's UST wasn't asset-backed at all, it was algorithmic, and lost its peg entirely in May 2022, which is a reminder that "backed" claims should always specify by what.

What should you check before trusting a peg?

Read the latest attestation or audit yourself, not a summary tweet.
Confirm the accounting firm's identity and whether the report is dated within the last 60 days.
Check the reserve composition for commercial paper, loans, or crypto collateral over 5-10% of the total.
Look up redemption minimums and KYC requirements before you need to use them.
Search for the issuer's name plus "reserves lawsuit" or "attorney general" to see prior disputes.

None of this guarantees safety. It just tells you whether the issuer is willing to show its work.