Risks in Crypto
You can see it. That is not the same as being able to move it.
Leave assets on a central platform and the platform holds the keys. Your account still shows a number — whether that number moves now depends on somebody else's condition as well as your own.
The problem
Two holders. The same coin. One event at a time.
You hold on a platform. Somebody else holds the same coin in self-custody. Fire each event and watch which side it lands on.
One event, two holders
ILLUSTRATIVE MODELThe platform holds the keys. You hold an account. The figure is illustrative — what happens to it is the point.
They hold the keys themselves. No platform stands between them and the coin.
Both balances are movable. Fire any of the three events above.
Three different events, one shared shape. Your balance was displayed the whole way through — it never dropped, never greyed out, never warned you. What changed was not the number, it was whether you could act on it. That is custody risk: on a custodial platform you normally do not control the private keys, you control an account, and access through an account can be paused, degraded or restricted by somebody who is not you.
None of the three touched the other holder — not because self-custody is stronger, but because none of those three failures had anywhere to land. There was no withdrawal queue, no platform app, no account to restrict. Now let the failure be theirs instead.
Read that in both directions. The party who can stop you is also a party you can ask — and the holder nobody can stop is the holder with nobody to call when the failure is their own. Same end state on screen, opposite causes, and a completely different set of people who could undo it.
So this is not an argument for one model over the other, and nothing here says where anything should be held. It maps which failures reach which holder. The custody decision itself — what custodial and non-custodial each cost you — is made in 05.4 · Custodial vs Non-Custodial, and this lesson does not re-open it.
The definition
Three claims worth turning over.
Tap each card for what sits behind it.
Hands on
Five situations. Three risks.
Custody risk is the source; these are the shapes it actually arrives in. Pick a situation, then file it under the risk it belongs to.
Choose a situation above, then file it.
Withdrawal stop, technical outage, regulatory intervention — in all three you can still see the assets in the account and still cannot move them freely. Access depends on the platform as well as on you.
The bridge
One fact, three consequences, one question.
The last card is the only thing you have to answer for yourself.
Exchange risk does not mean every platform is unsafe. It means control over access is shifted onto the platform, and that shift is worth making on purpose rather than by leaving things where they happen to be. Convenience against control, decided deliberately. The next lesson stays with risk but changes where it lives — from a company that can pause you to code in DeFi that cannot pause at all: smart contract risks.
Check yourself
Five questions.
Answers come straight from this lesson. Submitting completes it.