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.
✦ 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
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.