EXPLAINER
Reading an exchange proof of reserves without fooling yourself
Proof of reserves shows assets. It does not show liabilities. What these attestations actually establish, and the question they leave open.
Quick answer
Proof of reserves demonstrates that an exchange controls certain assets at a point in time. Without a matching proof of liabilities it does not show solvency, because it says nothing about what is owed.
Proof of reserves became standard after several large failures, and it is a genuine improvement on nothing. It is also routinely over-read.
What it shows
That an exchange controlled particular addresses holding particular balances at a particular moment. Usually demonstrated by signing a message with the relevant keys.
What it does not show
What the exchange owes. Solvency is assets minus liabilities, and an attestation covering only assets is half a balance sheet. An exchange holding a billion dollars is solvent if it owes nine hundred million and deeply insolvent if it owes two billion. The proof looks identical.
The snapshot problem
Point-in-time attestation can, in principle, be satisfied with assets that are not there the next day. This has happened. Frequent or continuous attestation reduces the concern; an annual snapshot barely touches it.
What good looks like
- A liability proof alongside the asset proof, usually a Merkle tree letting you verify that your own balance was included in the total.
- Attestation by a named auditor who accepts responsibility for the work.
- Frequent publication rather than an annual event.
- Coverage of every asset, not only the flagship one.
The Merkle liability proof is the important one, because it is the only part you can personally verify. If you can check that your balance is in the tree and the tree totals to the published liability, the attestation means something. Without it you are trusting a summary.
The underlying point
None of this changes the basic position: assets on an exchange are a claim on a company, not assets you hold. Proof of reserves makes the company more legible. It does not convert the claim into possession.
Key takeaways
- Assets without liabilities is half a balance sheet.
- A point-in-time snapshot can be satisfied with borrowed funds.
- Look for a Merkle-tree liability proof you can verify your own balance against.
Frequently asked questions
Does proof of reserves mean my funds are safe?
No. It is evidence about assets at a moment in time. Without a liability proof it does not establish solvency, and it never changes the fact that you hold a claim rather than the asset.
How do I verify my balance is included?
Exchanges publishing a Merkle liability proof provide a record ID and a verification tool. If yours does not offer this, the attestation is not one you can check.
