Not Your Keys, Not Your Coins

Not your keys, not your coins is the bitcoin maxim stating that whoever controls the private keys owns the bitcoin, and anyone holding coins on an exchange or with a custodian owns only a promise. The phrase condenses bitcoin's custody model into a warning: custodial balances are IOUs, redeemable only while the institution remains solvent and willing.

Why it matters

The maxim is written in losses. Mt. Gox, once the dominant bitcoin exchange, collapsed in 2014 with roughly 850,000 BTC missing, and creditors waited a decade for partial recovery. FTX failed in November 2022 with billions in customer assets gone, and dozens of smaller platforms have frozen withdrawals, been hacked, or vanished. In every case, customers who believed they owned bitcoin learned they owned unsecured claims in a bankruptcy. Because bitcoin transactions are irreversible and coins are bearer assets, custodial failure is uniquely unforgiving, and the only complete defense is holding one's own keys, with the responsibility that entails.

In the gold vs bitcoin debate

The principle predates bitcoin: gold holders have always distinguished metal in hand from metal in someone else's vault, and unallocated gold accounts have burned claimants in exactly the Mt. Gox pattern. Both assets deliver their core promise, freedom from counterparty risk, only under self-custody. The comparison then turns practical: keys are easier to secure, back up, and move than bullion at any meaningful scale, while metal cannot be phished, wiped, or lost to a forgotten passphrase. The maxim's discipline applies equally to both. The phrase has earned its place as the first lesson offered to newcomers in either asset.