Proof of Reserves

Proof of Reserves (PoR) is a verification process that demonstrates a centralized custodian (exchange, lender, stablecoin issuer) holds the assets it claims to hold on behalf of its users. The strongest forms are cryptographic and verifiable by any user.

By Crypto University EditorialLast updated June 4, 2026

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✦ Key Insight

After the 2022 collapse of FTX and others, PoR became a standard demand from depositors. For traders choosing exchanges or stablecoins, the quality of the PoR — and whether it includes liabilities, not just assets — is one of the few hard signals of custodial integrity.

✕ Common Misconceptions

Trusting "Proof of Reserves" that only shows assets and not liabilities.

Forgetting that PoR is a snapshot — it does not prevent borrowing assets just for the snapshot moment.

Confusing audited financial statements with cryptographic proofs.

Detailed Explanation

How It Works: Reserves are demonstrated by publishing on-chain wallet addresses and signing messages from them. Liabilities are typically attested by a Merkle tree of user balances: each user can verify their balance is included in the total. The two figures together prove the custodian is solvent at the snapshot moment.

FAQs:

Does PoR mean my funds are safe? It improves visibility but does not eliminate operational, legal, or jurisdictional risk.

Why don't all exchanges publish PoR? Some claim operational complexity; others avoid it for regulatory or business reasons.

In Practice

“An exchange publishes a Merkle root of user balances and a list of cold wallet addresses. A user logs in, sees their balance hashed into the Merkle tree, and can verify independently that the wallets hold more than the sum of liabilities.”

Dig Deeper

Stablecoin

A cryptocurrency designed to maintain a stable value, usually pegged 1:1 to fiat like USD (e.g., USDT, USDC).

Hardware Wallet

A physical, offline device (such as Ledger Nano S/X, Trezor Model T, or KeepKey) that securely stores your cryptocurrency private keys and signs transactions without ever exposing the keys to the internet or your computer/phone.