What an attestation must prove

The argument about whether stablecoin issuers should publish their reserves is finished. Federal law requires it. The argument that replaced it is narrower, more technical, and determines whether the requirement means very much: what an examination of those reserves has to establish.

The statute sets the frame. The GENIUS Act requires permitted issuers to publish the composition of their reserves monthly, to have those reports examined by a registered public accounting firm, and to obtain certifications from the chief executive and chief financial officer.

Monthly is a demanding cadence for anything an accounting firm signs. Most public company reporting is quarterly with a single annual audit, so the law is asking for a recurring procedure that has no exact precedent at this frequency.

The open question is the assurance level, and it is not a technicality. An examination performed at limited assurance concludes that nothing came to the practitioner's attention suggesting a problem. One performed at reasonable assurance states positively that the reserves are what the issuer says they are.

Those are different products with different costs and very different meanings to a reader, and the same document title can describe either. A holder comparing two issuers' monthly reports has no reliable way to tell which standard produced them without reading the fine print.

Regulators are consulting rather than assuming. Rulemaking has asked directly whether the examination should be conducted at reasonable assurance, under established attestation standards, or under an alternative framework built for the purpose.

The content of the disclosure is comparatively settled. The expected reporting covers the par value of coins outstanding, the fair value of reserve assets by category, the weighted average maturity of Treasury holdings, the names of custodians and depository institutions, and a reconciliation showing reserves at least equal outstanding coins.

That reconciliation is the heart of it. Everything else describes the portfolio; the reconciliation is the statement that the portfolio covers the liability, and it is the sentence a holder is actually relying on when they treat a token as a dollar.

Supervisors have published implementation requirements through the ordinary rulemaking process, including standards for insured depository institutions and supervised issuers, which is how a novel instrument gets absorbed into an existing supervisory apparatus.

The practical effect of a strong answer would be consolidation. A monthly reasonable-assurance examination is expensive, requires reserve assets an accounting firm can verify quickly, and is easiest for issuers holding short Treasuries at large custodians, which is a narrower field than the one that exists today.

That may be the intended outcome. A payment instrument that circulates as a dollar substitute is a poor place for structural creativity, and the assurance standard is the lever that decides how much of it survives.