Foundations
How a wallet actually works, and what a wallet is not
The word is a bad metaphor. A wallet holds nothing. Understanding what it does hold removes a whole category of confusion about backups, recovery and what happens when a device breaks.
A physical wallet contains your money. If it burns, the money is gone. Nearly every wrong intuition people have about crypto storage comes from taking that metaphor literally, and the software industry has never corrected it because "wallet" sounds friendlier than what it is.
What is actually stored where
Your assets exist as entries on a public ledger, replicated across thousands of machines. They are not in your phone, your laptop, or the metal plate in your safe. Nothing you own is inside your wallet app.
What the app holds is a secret that authorises changes to those ledger entries. The wallet is closer to a signet ring than a purse: it does not contain the estate, it proves you may direct it.
The chain from seed to address
- A seed phrase — usually twelve or twenty-four ordinary words — encodes a single large random number. Everything else derives from it.
- Private keys are generated from that number by a fixed, public procedure. The same seed always produces the same keys, on any compatible software.
- Public keys are derived from private keys, one way only. You can compute the public key from the private one; the reverse is not feasible.
- Addresses are derived from public keys. These are what you share.
- A signature is produced by the private key to authorise one specific transaction. It proves control without ever revealing the key.
The consequences, which are the actual point
Because every step after the seed is a deterministic public procedure, several things follow that surprise people:
- The device does not matter. A broken, lost or stolen device is an inconvenience. The seed reconstructs everything on new hardware, from a different vendor, years later.
- The seed is the whole thing. Anyone who reads it has complete control, immediately and irreversibly. This is why photographing it, typing it into anything, or storing it in a notes app that syncs is catastrophic rather than merely unwise.
- A hardware wallet is not special storage. It is a device that keeps the key in a chip that will sign transactions but will not export the key. The protection is against your own general-purpose computer, which is a reasonable thing to distrust.
- "Sending to your wallet" is loose talk. You send to an address the wallet can authorise. The wallet never receives anything.
The question that catches almost everyone: if the wallet app is deleted, are the funds gone? No — provided you have the seed. If the seed is gone, a perfectly working app on a perfectly working phone will keep showing the balance right up until the day the device fails, and then it is unrecoverable. The app's health tells you nothing about your actual position.
Approvals — the part that is not about keys at all
On networks that run smart contracts there is a second mechanism that behaves very differently. You can grant a contract permission to move tokens on your behalf, and that permission persists after the transaction that created it. It is not a one-off; it is a standing authority.
Many thefts involve no compromised key at all. The victim approved something, often with an unlimited allowance, often months earlier, and the contract later used exactly the permission it was given. Nothing was hacked. Reviewing and revoking old approvals periodically is basic maintenance, and almost nobody does it.
Testing your backup
Write the seed on paper or stamp it into metal. Never photograph it, never type it into a computer, never store it anywhere that syncs. Then — and this is the step people skip — wipe a spare device, restore from the seed alone, and confirm the same addresses appear. Until you have done that, you have a plan, not a backup.
Last reviewed: 11 September 2026