Key takeaways
- Coins live on the blockchain. The wallet stores keys that authorize transfers.
- Custodial apps (exchanges) hold keys for you. Self-custody means you hold them.
- A seed phrase is not a username. Anyone who copies it can empty the account.
Search interest in crypto cools and spikes with prices, but the mechanical question does not change: what do you actually possess? On public chains, balances are entries. A “wallet” is software or hardware that stores cryptographic keys. Those keys sign transactions. No key, no move.
Custodial vs self-custody
If an exchange holds the keys, you have an IOU from that company, plus whatever legal claim your jurisdiction gives you if it fails. If you hold a seed phrase, you are the custodian. That is power and a single point of failure: phishing, a photo of the phrase, or a house fire with no backup.
What a price chart does not tell you
Transfers, fees, and irreversible mistakes are independent of whether “Bitcoin” is trending. If you cannot explain who can sign a send, you do not yet understand the product.
This is a mechanics explainer, not a prediction or a pitch to buy crypto.
