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Stablecoin Reserves & Attestations

How do you know a stablecoin is actually backed? Separate reserve composition, custody, verification, and redemption.

By Anton Titov, Founder · Plexo Institute

Published 2026-05-17

Institutional stablecoin diligence is four questions, not one: what backs the token, where the assets sit, who verifies them, and whether redemption works under stress.

Reader Brief

Reading Guide

Four moves that turn "how do I know it is backed?" into a treasurer-grade diligence framework.

Reserve, custody, verification, and redemption are four different questions.

A "yes" on one question is not enough. An issuer can have safe assets with weak custody, or strong custody with verification that misses what matters. Treasurers need separate answers for composition, custody, verification, and redemption.

Payment-stablecoin reserves now look like treasury portfolios.

MiCA, GENIUS, and UAE PTSR converge on low-risk, liquid reserve assets. This is a sharp move away from the commercial-paper and credit-exposure mix that existed in parts of the market before 2021.

Custody concentration can de-peg safe reserves.

USDC March 2023 showed the failure mode: the assets were ultimately safe, but $3.3B at Silicon Valley Bank could not move during the weekend. Stablecoin custody needs diversification at the institution level, not just safe asset composition.

Attestation is not audit.

Monthly attestation is limited assurance on a single date. Annual audit is broader assurance over financial statements, controls, and going concern. MiCA and GENIUS now close much of the historical attestation-only gap.

Four Questions a Treasurer Must Answer

Backing is not one diligence question; it is four.

A treasury team should treat reserve diligence as four linked checks rather than one headline reserve ratio.

Layered reserve diligence diagram showing composition, custody, verification, and redemption checks with a failure mode for each layer. — Reserve confidence is a stack, not a ratio; a weakness in any layer can break trust under stress.

Question	What it asks	Where the answer lives
Composition	What assets back the token?	Issuer disclosure and attestation
Custody	Where are assets held, and who can move them?	Custodian roster and segregation opinions
Verification	Who confirms reserves exist on a given day?	Monthly attestation report
Redemption	Can holders convert back to fiat under stress?	Redemption mechanics and stress history

Reserve Composition

Payment-stablecoin reserves are moving toward short-dated, liquid, low-credit-risk assets.

Composition is the first filter because it determines whether the backing pool can be liquidated quickly without credit losses.

The composition regulators now require

MiCA requires sufficiently liquid low-risk assets and safeguarded funds. GENIUS permits cash, demand deposits, T-bills with maturity up to 93 days, and repos collateralized by those assets. UAE PTSR requires high-quality liquid assets with custody and concentration controls. The direction is clear: payment-stablecoin reserves should look like treasury portfolios, not credit portfolios [3][4].

Composition risks that remain

Repo counterparty risk, money-market-fund exposure, bank deposit concentration, and non-US sovereign holdings can still introduce risk. "T-bills and cash" is safer than 2021-era credit exposure, but it is not a complete answer without custody and redemption analysis.

Reserve Custody

Safe assets at a single custodian are not operationally safe assets.

Circle disclosed that $3.3B of USDC reserves were held at Silicon Valley Bank when SVB failed. The reserves were not credit-impaired in the final outcome, but the operational effect was immediate: USDC traded down sharply over the weekend before federal action restored confidence [6]. The lesson is that custody concentration can break peg confidence even when assets are high quality.

Number of custodians and concentration limits
Bankruptcy-remoteness and jurisdiction-specific segregation opinions
Who can move reserves under ordinary and stress conditions
Geographic distribution and jurisdictional risk

Attestation vs Audit

A monthly reserve snapshot is not a full financial audit.

The practical difference is scope: attestations answer a point-in-time reserve question, while audits examine the broader issuer.

Property	Monthly attestation	Annual audit
What it verifies	Reserve balance on a single date	Financial statements, controls, operations, and going concern
Assurance	Limited assurance	Reasonable assurance
Scope	One day and narrow reserve item	Full fiscal year and broader issuer operations
What it misses	Other days, controls, related-party issues	Much less, though no audit removes all risk

Why "100% attested" is incomplete

A monthly attestation can say reserves equaled tokens outstanding on date X. It does not prove reserves were sufficient on the other days of the month, that custody controls were adequate, or that related-party transactions were arm-length. The phrase may be technically true while still being materially incomplete [5].

How MiCA and GENIUS raise the floor

Both frameworks add annual financial-statement audit requirements and prudential supervision to the historical attestation baseline. That matters because counterparties need more than a reserve snapshot to size exposure.

Redemption Mechanics Under Stress

The peg holds only if authorized counterparties can redeem at par when it matters.

Redemption is where reserve quality becomes operational reality: the assets must be available, transferable, and usable during stress.

The stress-redemption pipeline

A counterparty submits a redemption request, sends tokens to the issuer burn address, receives fiat back, and arbitrages the gap between secondary-market price and issuer redemption. If any step breaks, the peg can break even when reserve assets are sound.

Historical stress benchmarks

Tether redeemed large volumes during 2022 market stress while maintaining market confidence; USDC March 2023 showed custody access can temporarily break confidence. The pattern is simple: stablecoins that redeem under stress keep trust; issuers that suspend or slow redemption lose share.

Circle vs Tether Transparency Gap

For treasurers, disclosure quality and audit posture are part of the product.

For institutions, transparency is part of liquidity because unclear disclosures raise the cost of trust and slow counterparty approval.

Disclosure differential

Circle publishes monthly reserve reports, a clearer custodian posture, and MiCA-aligned issuer information. Tether publishes reserve composition and attestations but has historically offered less granular custodian transparency. For regulated counterparties, the compliance cost of using a token depends on this disclosure posture as much as on liquidity.

Evidence And Sources

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