Key takeaways
- Proof of reserves shows that a crypto platform controls certain assets at a point in time, usually by signing with wallet keys or publishing wallet addresses.
- It does not, on its own, prove the platform owes customers less than it holds, because it says nothing about liabilities.
- A reserve attestation or examination by an accounting firm tests both assets and obligations against defined criteria, but is still a point-in-time opinion.
- Regulated regimes, such as the GENIUS Act, require monthly accountant examination; the strongest assurance comes from daily reconciliation behind it.
What proof of reserves is
Proof of reserves is a method crypto platforms use to show customers that assets exist. The platform publishes the addresses of its wallets, or signs a message with their private keys, so anyone can see the balances on the blockchain. Some platforms add a Merkle tree, a data structure that lets each customer check that their own balance is included in a published total, without revealing other customers' balances.
Methods vary. Some platforms publish wallet addresses so anyone can view balances. Others sign a message with each wallet's private key to prove control without moving funds. A small number commission an accounting firm to review the process. The quality of the assurance depends heavily on which method is used and what it covers.
Proof of reserves became widespread after several large crypto platforms failed in 2022 with customer assets missing. It improves transparency, but it has limits that buyers and regulators now understand well.
What proof of reserves does not prove
The main limit is liabilities. Showing that a platform controls 10,000 bitcoin says nothing about whether it owes customers 9,000 or 15,000. Without a complete and verified list of customer balances, proof of reserves can show assets that are already owed elsewhere, borrowed for the day, or double-counted. It is also a snapshot: assets present at the moment of the check may not be present the next day.
Proof of reserves can also miss assets that appear to be held but are encumbered, for example pledged as collateral or lent out, and assets held by a third party on the platform's behalf. An honest proof of reserves states clearly what it covers and what it does not.
| Question | Proof of reserves | Accountant attestation or examination | Daily reconciliation |
|---|---|---|---|
| Do the assets exist? | Yes, at a point in time | Yes, tested | Yes, every day |
| Are all customer obligations included? | Not on its own | Yes, tested against criteria | Yes, every day |
| Are assets free of other claims? | No | Partly, depending on scope | Partly, with custody records |
| Is coverage maintained between checks? | No | No | Yes |
| Independent? | Depends on method | Yes | Internal control, evidenced |
What a reserve attestation adds
An attestation or examination is performed by an accounting firm under professional standards. The firm tests the platform's statement of assets and obligations against defined criteria, such as the AICPA's criteria for stablecoin reporting, and issues an opinion. It covers liabilities as well as assets and is independent. But it is still an opinion at a date, or over a short period, and its scope depends on the engagement.
Regulators have moved toward accountant examination as the standard. The GENIUS Act requires a monthly reserve report examined by a registered public accounting firm, and NYDFS requires monthly independent attestation for the stablecoins it supervises.
The strongest assurance
The strongest assurance combines all three. Daily internal reconciliation of customer obligations against assets, per asset and per wallet, shows coverage every day and finds problems while they are small. Periodic accountant examination independently tests that process and its results. Public proof of reserves lets customers verify their own inclusion. A platform that can show all three gives customers, partners and regulators the clearest picture.
Safeheld provides the daily layer: reconciliation of ledgers, wallets, custodians and bank accounts per asset, with the history accountants test. See stablecoin reserve reconciliation and crypto custody reconciliation.
Frequently asked questions
What is proof of reserves?
A method for a crypto platform to show it controls certain assets at a point in time, usually by publishing wallet addresses or signing with wallet keys.
Is proof of reserves the same as an audit?
No. It shows assets exist but does not, on its own, verify liabilities or independent assurance.
What does a reserve attestation cover?
An accounting firm's examination of assets and obligations against defined criteria, resulting in a professional opinion.
What gives the strongest assurance?
Daily reconciliation of obligations and assets, tested by periodic accountant examination, with public proof of reserves alongside.
References
- GENIUS Act, S.1582, 119th Congress (Public Law 119-27)
- NYDFS, Guidance on the issuance of US dollar-backed stablecoins (June 2022)
About Safeheld
Safeheld reconciles client money every day, resolves every difference and prepares every regulatory return for sign-off, for regulated firms in the United States, the United Kingdom, the European Union, Canada, Australia, Singapore and Hong Kong. To discuss your operations, contact us at safeheld.com/contact.
This article is for general information and does not constitute legal or regulatory advice.