Bitcoin Myths · #11 of 20
The Myth
Your bitcoin is yours on an exchange.
Reality check
A balance is not bitcoin.
Keys are.
When you leave bitcoin on an exchange, the exchange holds the private keys. You hold a balance in their accounting system, a record of what they owe you, not direct control over the on-chain bitcoin itself. The distinction only becomes visible when something goes wrong.
850,000
BTC lost in the Mt. Gox collapse
The largest exchange in the world. Customers had no warning.
In 2014, Mt. Gox, then handling the majority of all global Bitcoin trading volume, collapsed. Approximately 850,000 bitcoin belonging to customers had gone missing since 2011. The loss was invisible because customers trusted the exchange to hold their keys.$8B
Hole in FTX customer accounts at collapse, November 2022
Funds moved to a sister firm without customer consent. Repaid years later through bankruptcy proceedings.
72%+
Of all mined bitcoin held in long-term storage outside exchange circulation
Glassnode, 2026. Exchange reserves fell to a seven-year low after FTX collapsed.
0
Counterparty risk when you hold your own private keys
No platform between you and your bitcoin. Self-custody eliminates exchange failure as a risk entirely.
Exchange custody vs self-custody, what you actually control
| Exchange custody | Self-custody | |
|---|---|---|
| Private keys | Exchange holds them | You hold them |
| Withdrawal | Requires platform approval | Immediate, permissionless |
| Platform failure risk | Full exposure | None |
| Account freeze risk | Yes, exchange or regulator | None |
| What you own | A claim on the platform | The bitcoin itself |
Worth knowing
Not your keys, not your coins. That principle is true, but it is also not a deadline. For a small amount while you are learning, a reputable exchange is a reasonable starting point. The goal is an informed choice, not immediate action.