"Not Your Keys, Not Your Coins": What It Really Means
CryptoRebateHub Editorial Team
This crypto adage means: if your coins are on an exchange, the exchange controls them and you only hold its IOU; only by withdrawing to a wallet whose keys you control do you truly own them. Here is the principle, the trade-offs, and what to actually do.
It's the most-quoted — and most-ignored — line in crypto. Understanding it helps you avoid an FTX-style disaster.
The literal meaning On a blockchain, whoever holds the private key controls the coins. When your coins are on an exchange, the keys are the exchange's — the address on the ledger is theirs, and the number in your account is just its IOU to you. Whether you can withdraw depends on the exchange honoring its promise. That's "not your keys, not your coins."
Why it matters FTX users all saw balances in their accounts, but once the exchange had misused the underlying assets and couldn't pay out, those numbers became unwithdrawable. Holding the keys (self-custody) is different: your coins are on-chain, controlled by your private key, with no intermediary able to misuse or freeze them.
The trade-off: self-custody isn't free Self-custody hands you control and the full responsibility:
- Lose your key/seed phrase and no one can recover it — the coins are gone forever.
- A phishing signature or wrong transfer can't be reversed.
So self-custody demands real care with your seed phrase and cold wallet.
What to actually do (a balanced approach) You don't have to go to extremes. The practical move is to layer:
- Trading funds: keep on a reputable major exchange for convenience and rebates.
- Long-term savings: withdraw to your own self-custodied wallet.
See the self-custody guide and is crypto safe on an exchange.
In one line Exchanges are for trading, not for safekeeping. Grasp this adage and you'll know how much to leave on an exchange and how much to hold yourself.
Keep reading Surviving an exchange collapse, cold vs hot wallet, self-custody guide
