Understanding Crypto · Lesson 11 · Beginner

Custody and Counterparty Risk

You understand why an exchange balance is a deliberate counterparty risk and how to store holdings safely.

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Not your keys, not your coins

Ownership exists only through control of the private key. Loss is final, James Howells threw away a hard drive with 7,500 BTC. The seed phrase, usually 12 words, never belongs online.

Counterparty Risk

BTC and gold are not a liability of a third party. Bank balances, stablecoins and exchange balances very much are. The protocol has never been hacked, exchanges and wallets very much have, FTX and Mt. Gox.

Check your setup against the custody logic.

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Test yourself

You have 5 BTC on an exchange. What exactly do you own?

A claim against the exchange, not direct ownership
Direct on-chain ownership like with your own wallet

What has never been hacked in BTC history?

The Bitcoin protocol itself
The large exchanges

The key points at a glance

Ownership exists only through control of the private key, loss is final.
BTC is not a liability of a third party, exchange balances and stablecoins are.
Margin capital on the exchange is a deliberate risk, long-term holdings go into cold storage.

Deep dive

What do you own when your bitcoin sits on the exchange?

'Not your keys, not your coins' is precise accounting. Ownership of bitcoin exists only through control of the private key. If 5 bitcoin sit on an exchange, the exchange holds the keys, and you own a claim against the company, not direct on-chain ownership.

bitcoin and gold are not a liability of a third party.
Bank balances, stablecoins and exchange balances are always someone's debt.
In insolvency you stand in the creditor queue, see FTX and Mt. Gox.
The exchanges and wallets got hacked, never the protocol itself.

The four-quadrant model of custody

Custody has two axes: hot versus cold, and self versus third-party controlled. Hot means online and convenient, but exposed. Cold means offline and immune to remote attacks. The riskiest corner is hot and third-party, the large exchange balance. The safest is cold and self-controlled.

Keep on the exchange only what you need for open trades.
Store the long-term holdings in cold storage.
The loss is final: James Howells threw out roughly 7500 bitcoin on a hard drive.
There is no forgot-password function and no hotline.

Securing the seed phrase: the expensive mistakes

The seed phrase, usually 12 or 24 words, is the master key to your entire holdings. Whoever has it has the coins, without password or hardware. It belongs offline, on paper or metal, never in a field that a browser or app can submit.

Never digital: no screenshot, no cloud, no notes app, no email.
Phishing: no reputable service ever asks for the seed, the request is the attack.
Long-term holdings cold, only active capital on the exchange.
Move profits regularly from the trading pot into the long-term pot.

Sources: Ammous, Burniske/Tatar, Goodman

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