What Is Proof of Reserves?
Proof of reserves is an exchange publicly demonstrating it holds the assets customers deposited: wallet attestations, Merkle-tree inclusion proofs that let you verify your own balance was counted, sometimes an accountant's report stapled on. The practice went mainstream after FTX, whose collapse was precisely a reserves lie.
How It Actually Works
- The exchange signs messages from its wallets (proving control of assets) and publishes a cryptographic commitment to customer balances (letting each user check their inclusion without exposing everyone's data).
- Done honestly and regularly, it makes one specific fraud, claiming coins that do not exist, much harder to sustain.
- What it does not prove: liabilities. Assets shown minus debts hidden equals nothing learned. Borrowed coins can dress a snapshot; obligations to lenders do not appear in wallet signatures. Reserves without a liability audit is a photo of one side of a balance sheet.
Risks and Common Mistakes
- Reading a reserves page as solvency. Solvency is assets exceeding liabilities under audit, a bar most attestations never claim to clear.
- Ignoring freshness and coverage: a stale attestation covering some assets on some chains is marketing with math on it.
- Concluding that any transparency is worthless. Directionally, exchanges publishing verifiable reserves beat those refusing; it is a floor, not a ceiling.
When It Matters
Choosing where to hold trading balances, and calibrating how much stays there. The full answer remains structural: the only reserves you can fully audit are the ones behind your own keys, per self-custody and my Security page. Deposit-insurance reality: the insurance guide.
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