PolicyBrief
S. 1405
119th CongressApr 10th 2025
PROOF Act
IN COMMITTEE

The PROOF Act mandates digital exchanges and custodians to obtain monthly attestations and proof of reserves from independent auditors to ensure the protection of customer assets, with penalties for non-compliance.

Thom Tillis
R

Thom Tillis

Senator

NC

LEGISLATION

Crypto Exchanges Face New 'Proof of Reserves' Rules Under PROOF Act: Monthly Audits Mandated

Alright, let's break down the PROOF Act – legislation aimed at making sure the crypto exchange holding your digital coins actually has your digital coins. Think of it as a potential safety net for the digital wild west.

The core idea? This bill tells digital exchanges and custodians (the companies holding digital assets for others) they need to get serious about proving they aren't playing fast and loose with customer funds.

Keeping Your Crypto Safe (On Paper)

First up, Section 3 lays down some ground rules for how exchanges handle your assets. They need clear accounting standards and must hold your 'covered assets' – basically, your money and crypto, not theirs – in a way that minimizes the risk you could lose it or face delays getting it back. Crucially, the bill says they have to treat your assets as yours. That means no mixing their operational funds with customer funds, and generally, no using your Bitcoin to fund their own ventures. There are exceptions for things like settling your transactions or paying fees you owe, and they can substitute assets if you explicitly agree, but the baseline is stronger separation.

Show Me the Money: The Monthly Check-Up

The real headline-grabber is Section 4: mandatory monthly check-ups. Within 30 days of this section becoming active (more on that timing in a sec), exchanges and custodians must get an independent auditing firm (or a 'disinterested third party' if they can't find one) to perform an 'attestation'.

What's that involve? Two key things:

  1. Proof of Reserves: The auditor verifies the exchange actually possesses or controls the private keys needed to access and transfer the customer assets it claims to hold.
  2. Liability Check: The auditor verifies the exchange's debts to customers, likely using tech like cryptographic proofs (think Merkle trees or zero-knowledge proofs – fancy ways to confirm totals without revealing individual account details).

These audit reports get sent to the Treasury's Office of Domestic Finance and will be made public, naming both the exchange and the auditor. Transparency is the goal here.

The Waiting Game and The Penalty Box

Here's the catch: Section 4, the part requiring these monthly audits, doesn't kick in right away. First, the big accounting standard-setters (the Public Company Accounting Oversight Board and the American Institute of Certified Public Accountants) have to work with the industry to create official standards for how these digital asset attestations should be done. They have 90 days to solicit proposals and then up to 18 months (potentially longer with extensions) to actually approve a standard. Only after that standard is approved does the monthly attestation requirement start.

If an exchange fails to get its monthly attestation once the rules are live, the Treasury can hit them with fines. These penalties scale up based on user numbers and total assets under management:

  • First failure (in 24 mo): The higher of 25 cents per customer OR 0.025% of assets.
  • Second failure (in 24 mo): The higher of 55 cents per customer OR 0.055% of assets.
  • Third+ failure (in 24 mo): The higher of 90 cents per customer OR 0.09% of assets.

There's an annual cap, and failures get published publicly. Exchanges can appeal, and significantly, the penalty gets waived if the auditor messed up, not the exchange. So, while this aims to hold exchanges accountable, the real teeth depend on those standards getting finalized and enforcement being consistent.