CoinucationSelf-Custody
Self-custody means holding your own private keys, so you alone control your crypto without relying on an exchange or other third party.
Self-custody is when you, not a company, control the private keys to your crypto. Your funds sit at an address on the blockchain that only your wallet can spend from. No exchange can freeze them, no bankruptcy can take them, and no government can seize them without physically obtaining your keys. This is the property that makes crypto different from a bank balance.
The responsibility is total. There is no password reset, no fraud department, and no way to reverse a transaction sent to the wrong address. If you lose the seed phrase and the device, the funds are gone. If you sign a malicious transaction, the funds are gone. Surveys and blockchain analysis suggest that millions of bitcoin have been lost this way over the years.
Many people use a mixture: an exchange for buying and selling, a hot wallet for daily use, and a hardware wallet for long-term holdings. The slogan not your keys, not your coins became widespread after the 2022 exchange failures and summarizes why many participants consider learning self-custody a basic skill.
What is a private key? covers this in 6 minutes, with a quiz at the end.