🔑 Not Your Keys, Not Your Coins
The saying you keep hearing — and what avoiding it actually costs.
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The saying
There's a saying in Bitcoin you'll hear constantly:
"not your keys, not your coins."
By the end of this course, you'll know exactly what that means — and what it actually costs to avoid it.
What a key really is
A private key is the actual proof of ownership of bitcoin.
Whoever controls the private key controls the funds. Full stop.
Everything else in this course is really just a variation on that one fact.
A spectrum, not a switch
Custody isn't one choice — it's a full spectrum.
On one end, you hold zero keys yourself. On the other, you hold every key alone.
In between are options that split the responsibility across multiple parties.
The trade at the heart of it
More convenience and less responsibility on one end.
More control and more responsibility on the other.
Self-sovereignty is the deliberate act of choosing where on that spectrum you actually want to sit — not automatically sliding to one extreme.
Try it: Guess the spectrum
Order all five before you know anything about them. No score — we'll come back to it at the end.
ETF, exchange, hot wallet, hardware wallet, multisig — put them in order from least to most self-sovereign. Nothing is marked right or wrong: it's a pre-test, and the real order is revealed at the end of The Custody Spectrum course. See how much your instinct moves. Open the Guess the Spectrum tool →
Quick check: What actually proves ownership of bitcoin?
- The private key ✓
- Your account with a regulated provider
- A receipt from your purchase
Ownership is the ability to sign a transaction. Nothing else on the list can do that.
Quick check: Is custody a single choice, or a spectrum?
- A single choice — either you self-custody or you don't
- A spectrum, with different trade-offs at every point ✓
- A spectrum, but only for institutions
Five distinct positions in this course alone — and most people sensibly occupy more than one at a time.
Next up
Let's start at the end furthest from self-custody — owning "bitcoin" without ever touching a key at all.