Once you understand keys, storage is really one question: who holds the private key? Everything else — apps, devices, exchanges — is just different answers to that.
Custodial vs. self-custody
- Custodial: a company (typically an exchange) holds the keys for you. You log in with a password like a normal website. Convenient, recoverable if you forget your password — but you're trusting that company, and "not your keys, not your coins" applies. If it freezes withdrawals, gets hacked or fails, your funds are at risk.
- Self-custody (non-custodial): you hold the keys via a wallet. No one can freeze your funds and no one can bail you out either. Full control, full responsibility.
The three practical setups
1. Exchange (custodial)
Where most people start. Good for buying and selling; treat it like a cashier's desk, not a vault. Enable strong two-factor authentication and withdraw larger amounts to your own wallet.
2. Hot wallet (self-custody, connected)
A software wallet on your phone or browser. You hold the keys, and it's always online — great for everyday use and interacting with apps, but the connected device is the attack surface. Keep balances modest.
3. Hardware wallet (self-custody, cold)
A small physical device that keeps your private keys offline. Transactions are signed on the device, so keys never touch the internet. The standard choice for holding meaningful amounts long term.
Mistakes that lose funds
- Storing your seed phrase as a photo, cloud note or screenshot.
- Entering your seed phrase into a website or giving it to "support."
- Sending to the wrong network or a mistyped address (transactions are irreversible).
- Keeping everything on one exchange and assuming it can never fail.
- Approving malicious signing requests without reading them.
Why it matters
More crypto is lost to bad storage and scams than to price crashes. Getting this right — before you hold anything significant — is the difference between owning your assets and hoping someone else keeps them safe.
Next up: see which networks your assets might live on in Top chains and their features.