Table of Contents
A stablecoin attestation is an independent accountant's report on one claim: that, as of a named date, the fair value of reserve assets equaled or exceeded tokens in circulation. Reading it is a five-line extraction from the PDF — as-of date, circulating supply, reserve composition, the CPA's opinion language, and the lag between snapshot and publication — not a verdict that the issuer is safe.
An attestation answers whether the reserves were there on that day. It does not answer whether they were there the day before, the day after, or whether the issuer can still redeem.
Key Takeaways
- An attestation examines a management assertion at a point in time, not the issuer's full financial statements.
- The five facts that matter are as-of date, circulating supply, reserve mix, opinion language, and reporting lag.
- Examination language ("fairly stated, in all material respects") is stronger than agreed-upon procedures, which offer no opinion.
- Circle publishes monthly AICPA reports plus weekly holdings; Tether publishes quarterly BDO reports under IAASB standards.
- The GENIUS Act requires monthly reserve reports examined by a PCAOB-registered firm and certified by the CEO and CFO.
What an Attestation Actually Is
The issuer writes the assertion. The accounting firm tests it and signs a report under professional standards, typically AICPA attestation standards in the United States or ISAE 3000 internationally.
The usual assertion is narrow: as of 11:59 p.m. UTC on a stated date, the fair value of assets in the reserve was equal to or greater than tokens in circulation. That is a snapshot of two numbers, not a review of the business.
The accountant does not certify that the reserve mix is appropriate, that assets were unencumbered between reporting dates, or that the issuer will remain able to redeem. Those questions live in a full financial-statement audit, which covers a period rather than a day.
How to Find the Report
Go to the issuer's transparency page and download the latest PDF. Do not rely on the marketing summary, the dashboard graphic, or a press release that restates the conclusion.
Circle's transparency page hosts monthly USDC reports under AICPA attestation standards, plus weekly reserve composition. Tether's transparency page hosts quarterly reserve reports prepared with BDO Italia under International Auditing and Assurance Standards Board criteria.
Save the PDF. Issuers reorganize transparency pages; the file is the artifact that survives a vendor review.
The Five Lines That Matter
Open the report and extract these five facts in order. Everything else is context.
1. As-of date and publication lag
The as-of date is the snapshot, usually stated as a date and time in UTC. Circle's monthly examinations often cover two report dates in the same month; Tether's reports are quarter-end.
Subtract the as-of date from the publication date. A monthly issuer whose latest PDF is more than about 45 days old is running behind its own cadence; a quarterly issuer with a lag of several months is worse.
2. Tokens in circulation
Find the outstanding supply the accountant reconciled, not the figure on a market-data site. The report should define what "in circulation" includes and what it excludes — test tokens, locked tokens, and issuer-held inventory are common carve-outs.
Compare that number with on-chain supply. A material mismatch is a reason to stop, not a rounding issue.
3. Fair value of reserve assets
The second number is total reserve assets at fair value. It should equal or exceed circulation; a positive buffer is more informative than exact parity.
Then read the composition, not the total. Cash, overnight Treasury repo, and T-bills with short remaining maturity behave differently from gold, Bitcoin, corporate credit, or related-party loans, a distinction covered in our guide to how stablecoins are backed.
4. Opinion language and the standard applied
This is the line most readers skip and the line that determines what the document actually is. Three common forms appear in this market.
| Engagement | Typical language | What it gives you |
|---|---|---|
| Examination (AICPA AT-C 205) | "In our opinion, management's assertion is fairly stated, in all material respects." | Reasonable assurance on the assertion |
| Reasonable assurance (ISAE 3000) | Figures are "fairly presented" under the stated criteria | Reasonable assurance, international standard |
| Agreed-upon procedures (AT-C 215) | Procedures performed and findings listed; no opinion | No assurance opinion |
Circle's monthly USDC reports are examinations of management's assertion under AICPA attestation standards: the firm obtains reasonable assurance and issues an opinion. Tether's quarterly BDO reports are prepared under IAASB criteria and confirm that reported reserves and liabilities are fairly presented as of quarter-end.
If the PDF names no firm, names no standard, or is an internal management report, it is not an attestation.
5. Who signed, and which entity
The report should name the accounting firm, the issuer entity, and the reserve that was examined. A signature on the parent is not automatically a signature on every issuing subsidiary.
Check whether the same firm that attests reserves also audits the financial statements. Deloitte & Touche LLP has audited Circle's financials since fiscal 2022; Tether's quarterly reserve reports remain BDO Italia work, while KPMG's first full audit covers Tether International's 2025 financial statements, not the 2026 quarterly snapshots.
A Working Checklist
| Question | What to look for | Red flag |
|---|---|---|
| How fresh is the snapshot? | As-of date inside the issuer's stated cadence | Latest report more than ~45 days old for a monthly issuer |
| Do reserves cover circulation? | Fair value ≥ tokens, preferably with a disclosed buffer | Reserves below circulation, or exact parity with no explanation |
| What is in the reserve? | Cash, short-dated Treasuries, overnight Treasury repo | Commercial paper, related-party loans, undisclosed "other" |
| What standard was used? | Named firm; AICPA examination or ISAE 3000 | Unnamed firm, unstated standard, or internal memo |
| How long is the lag? | Days or a few weeks between as-of and publication | Months of silence, or a report that only appears after a crisis |
Circle and Tether, Line by Line
The two largest dollars illustrate why composition and cadence matter more than the word "attested."
Circle discloses USDC reserve holdings weekly and publishes a monthly third-party report confirming that reserve value exceeds circulation, under AICPA attestation standards. Most of that reserve sits in the Circle Reserve Fund (USDXX), an SEC-registered government money market fund managed by BlackRock, with the rest as cash at large banks.
That daily fund tape is not the attestation, but it lets you inspect the largest sleeve without waiting for the next PDF. The structure is set out in our guide to what backs USDC.
Tether publishes daily circulation figures and a quarterly BDO reserve report. The Q2 2026 report, as of June 30, showed about $187.75 billion in assets against $183.64 billion in liabilities, a $4.11 billion buffer, down from $8.23 billion at the end of March.
Gold, Bitcoin, and secured loans sit alongside Treasuries in that mix, so the buffer can move with asset prices even when the attestation still says fully backed. That composition is the subject of what backs Tether.
A clean attestation on a Treasury-and-cash book and a clean attestation on a book that includes gold and Bitcoin are not the same risk statement. The PDF will confirm both if the totals match; it will not rank them.
What the GENIUS Act Requires
Voluntary attestations are no longer the ceiling for U.S. payment stablecoins. The GENIUS Act requires every permitted payment stablecoin issuer to publish, monthly, the number of outstanding tokens and the amount and composition of reserves, including average tenor and geographic location of custody.
Each month-end report must be examined by a registered public accounting firm, and the chief executive officer and chief financial officer must certify its accuracy to the issuer's primary regulator. Issuers with more than $50 billion outstanding that are not already SEC reporting companies must also produce annual GAAP financial statements audited by a registered firm.
That statute raises the floor. It does not turn a monthly snapshot into continuous verification, and the form of the monthly examination is still being written in agency rulemaking, as our guide to how stablecoins are regulated tracks.
What the Report Cannot Tell You
Four gaps are built into the product.
It is a point in time. Reserves can change the next business day; nothing in a standard examination reconstructs the days in between.
It does not test internal controls the way a financial-statement audit does. A clean examination of an assertion is not a SOC report and not a going-concern opinion.
It does not prove assets are unencumbered for the whole month. The monthly PDF is still not a lien search.
It does not mean the token is insured or instantly redeemable by every holder. Attestation is a verification of reported backing, not deposit insurance and not a retail redemption window.
Conclusion
How do you read a stablecoin attestation? Download the latest PDF from the issuer's transparency page, then extract five facts: the as-of date, tokens in circulation, the fair value and mix of reserves, the CPA's opinion language and standard, and the lag to publication.
Treat a named-firm examination under AICPA or ISAE 3000 as meaningful assurance on that day's assertion. Do not treat it as proof that the issuer is sound, that reserves were stable all month, or that you can cash out at par tomorrow.
FAQs:
1. What does a stablecoin attestation actually confirm?
It confirms that, as of a named date, management's assertion about reserves — usually that fair value of reserve assets equaled or exceeded tokens in circulation — is fairly stated under the stated criteria. It does not confirm solvency, control quality, or conditions on any other day.
2. How is an attestation different from an audit?
An attestation covers a specific assertion at a point in time. A full audit covers the issuer's financial statements, transactions, and systems across a reporting period and produces an opinion on those statements as a whole.
3. Where do I find Circle's and Tether's reports?
Circle posts monthly USDC attestation reports and weekly reserve figures on its transparency page. Tether posts daily circulation and quarterly BDO reserve reports on its transparency page.
4. What opinion language should I look for?
Prefer an examination conclusion that management's assertion is fairly stated in all material respects, or an ISAE 3000 reasonable-assurance conclusion that the figures are fairly presented. A procedures-and-findings letter with no opinion is weaker; a report with no named firm or standard is not an attestation.
5. Does a clean attestation mean the stablecoin is safe to hold?
No. A clean report reduces uncertainty about reported reserves on that date, but it does not provide deposit insurance, guarantee redemption, or rank the quality of assets inside the reserve.
This content is provided for informational and educational purposes only and does not constitute financial, investment, legal, or tax advice; no material herein should be interpreted as a recommendation, endorsement, or solicitation to buy, sell, or hold any financial instrument, and readers should conduct their own independent research or consult a qualified professional.
){kind=link}