Proof of Reserves
What backs your
stablecoins.
The big picture: Every major stablecoin claims 1:1 backing. This page maps what those reserves actually hold, who verifies them, and how the industry is moving from quarterly attestations to full Big Four audits — driven by the GENIUS Act and institutional demand.
Why it matters: The difference between an attestation and an audit is the difference between a snapshot and an x-ray. Attestations confirm reserves exist at a point in time. Audits verify the financial architecture — internal controls, accounting practices, and operational risk. The stablecoin industry is in the middle of that transition.
Reserve Breakdown
What's in the vault
Reserve composition across the five largest fiat-backed stablecoin issuers. US Treasuries dominate — Tether alone holds $135B+ in T-bills, making it one of the largest sovereign debt holders globally.
Audit & Attestation Timeline
The path from attestation to audit
Key milestones in each issuer's transparency journey — from first attestation through regulatory shifts to full audit engagement. Hover over events for details.
Know the Difference
Attestation vs. full audit
What to know: These terms are not interchangeable. The stablecoin industry has operated on attestations since inception. The GENIUS Act §4 changes that — requiring annual audits for issuers above $50B in circulation.
Attestation
Point-in-time snapshot
- Confirms reserves exist at a specific date
- Scope defined by issuer (not auditor)
- No opinion on internal controls
- No evaluation of accounting practices
- Typically quarterly or monthly
- Standard: AICPA AT-C 205
Example: Circle's monthly Deloitte attestation confirms USDC reserves ≥ tokens outstanding on the attestation date.
Full Audit
Comprehensive examination
- Evaluates the entire financial architecture
- Scope defined by auditing standards
- Tests internal controls and processes
- Opinion on fair presentation of financials
- Annual, with interim procedures
- Standard: AICPA AU-C / PCAOB AS
Example: Tether's KPMG engagement — the first full financial statement audit of a $144B stablecoin issuer.
Issuer Status
Current audit standing
USDT
Full AuditTether
Largest inaugural audit in financial markets history. $135B+ in Treasuries via Cantor Fitzgerald. $13B profit in 2024. Eyeing $15-20B equity raise at ~$500B valuation. MiCA non-compliant — delisted from EU exchanges. TRON network carries ~50% of USDT volume.
USDC
AttestationCircle
Industry transparency leader. Monthly attestations since 2022. Full audited financials in IPO S-1 filing. 100% cash + Treasuries.
USDP
AttestationPaxos
NY DFS-regulated trust company. Also issued BUSD (discontinued) and USDG (Global Dollar Network with DBS). OCC conditional trust charter.
RLUSD
AttestationRipple
Newest major stablecoin. Dual-chain issuance (XRPL + Ethereum). NY DFS approved. Leveraging XRPL Permissioned DEX for institutional distribution.
FDUSD
AttestationFirst Digital
Hong Kong-domiciled. Primary listing on Binance. Survived public reserve dispute in 2025 with confirmed attestation.
The Tether Compliance Arc
From opacity to Big Four audit: Tether's $144B credibility play
The big picture: Tether's compliance story is the single most consequential narrative in stablecoin history. The issuer behind ~60% of all stablecoin volume spent seven years as the industry's most scrutinized and least transparent participant. In March 2026, it engaged KPMG for the largest inaugural financial statement audit ever undertaken. Understanding how Tether got here — and what it means for the market — requires tracing the full arc.
The Arc
Eight years from first controversy to Big Four engagement
2018–2021 · The Opacity Era
Tether surpasses $1B in market cap with no independent verification. The New York Attorney General files suit alleging Bitfinex used Tether reserves to cover an $850M loss. The CFTC fines Tether $41M for misrepresenting reserve composition between 2016–2019. The NY AG settlement in 2021 requires quarterly reserve reports — the first external accountability mechanism.
2021–2022 · First Light
Moore Cayman delivers the first independent attestation in March 2021. Tether survives the Terra/Luna collapse in May 2022 — market cap drops from $83B to $66B but USDT holds its peg, the first real stress test of reserves adequacy. BDO Italia replaces Moore Cayman for quarterly attestations, signaling a move toward larger, more credible firms.
2023 · The Treasury Pivot
Tether eliminates commercial paper entirely from its reserves — the asset class that drew the most criticism. Replaces it with US Treasuries, reaching 73% of total reserves. Reports $6.2B in profit for the year. Bitcoin and gold added as reserve assets. The reserve composition now resembles a conservative money market fund with crypto exposure — a deliberate repositioning.
2024 · Infrastructure & Setbacks
Cantor Fitzgerald becomes US Treasury custodian for Tether reserves — a major institutional partnership. But MiCA takes effect in the EU and USDT is delisted from European exchanges for non-compliance. Tether is now the largest stablecoin globally but locked out of the world's second-largest regulated market. The compliance gap becomes a strategic liability.
2025 · The Institutional Turn
Hires CFO Simon McWilliams (ex-BNY Mellon) to modernize financial architecture. GENIUS Act passes with §4 mandating annual audits for issuers above $50B — Tether is squarely in scope. Launches USAT, a new US-compliant stablecoin designed for GENIUS Act from the ground up. Reports $13B in profit for 2024 — the largest annual profit in crypto history. Establishes Tether Data (AI infrastructure) and acquires a stake in Rumble, signaling diversification beyond stablecoins.
2026 · The Audit
KPMG engaged for the first full financial statement audit — the largest inaugural audit in financial markets history. PwC hired in a secondary role for audit readiness assessment. The engagement covers $144B in reserves across US Treasuries, cash, Bitcoin, gold, and secured loans. Tether is reportedly eyeing a $15–20B equity raise at approximately $500B valuation. Audited financials are a prerequisite.
What It Means
Six implications of Tether's compliance transformation
GENIUS Act Compliance
§4 mandates annual audits for issuers with ≥$50B in circulation. Tether's $144B market cap puts it squarely in scope. The KPMG engagement positions Tether ahead of the compliance deadline — a first for an issuer that historically trailed regulatory expectations.
Institutional De-risking
A Big Four audit removes the single largest barrier to institutional USDT adoption. Banks, asset managers, and payment processors can reference an audited financial statement rather than attestation letters. This is the difference between "we checked" and "KPMG checked."
IPO Positioning
Audited financials are a prerequisite for any serious capital markets transaction. The $15–20B equity raise at ~$500B valuation requires institutional-grade financial disclosure. KPMG's involvement is the clearest IPO readiness signal Tether has sent.
Industry Precedent
If KPMG can audit $144B in crypto-native reserves — Treasuries, BTC, gold, secured loans — it sets the template for every other stablecoin issuer. The audit methodology becomes the industry standard. Smaller issuers will be expected to follow.
The MiCA Gap
Despite the KPMG engagement, USDT remains non-compliant with MiCA and delisted from EU exchanges. The audit addresses US regulatory requirements but does not solve Tether's European market access problem. USAT may be the vehicle for EU re-entry, but the timeline remains unclear.
The TRON Question
Approximately 50% of USDT volume flows through the TRON network — a chain flagged by the UN for facilitating illicit finance in Southeast Asia. A Big Four audit covers the reserves, not the on-chain distribution. Tether's compliance transformation is real but incomplete until network-level exposure is addressed.
The bottom line: Tether's compliance arc is the most dramatic repositioning in stablecoin history. From NY AG settlements and CFTC fines to KPMG and a potential IPO in under five years. The audit doesn't erase the history — but it transforms the forward-looking story. For compliance professionals, the question is no longer "is Tether backed?" It's "is the compliance infrastructure around USDT adequate for its market dominance?"
Methodology
How reserve data is sourced
Reserve composition percentages are derived from the most recent published attestation or financial disclosure for each issuer. Timeline events are sourced from public announcements, regulatory filings, and attestation reports. Market capitalization figures reflect approximate values as of March 2026. Audit status reflects publicly confirmed engagements — "full-audit" means a Big Four or equivalent firm has been formally engaged for a financial statement audit, not merely attestation.
Go deeper: See Compliance Checkpoints for the obligation framework, GENIUS Act for the §4 audit mandate, and Dev Tools for the SDKs that implement compliance.