Definition
Self-custody means holding the private keys to your own Bitcoin, rather than trusting a custodian such as an exchange to hold them for you. It is the practical expression of the maxim "not your keys, not your coins": whoever controls the private key controls the bitcoin, full stop. When you leave coins on an exchange, you hold an IOU and trust that institution's solvency, security, and goodwill; when you self-custody, you alone can move the funds, and no third party can freeze, lend, or lose them.
What it requires
Self-custody is a responsibility as much as a right. You generate and protect a seed phrase, ideally on a dedicated hardware wallet, keep it in cold storage, and back it up against loss. There is no password-reset and no support line — the flip side of having no gatekeeper is having no safety net, which is why disciplined backup and verification matter so much.
Reducing single points of failure
Mature self-custody distributes risk. A passphrase adds a second factor beyond the written words; multisig spreads control across several keys so no single loss or theft is fatal; and running your own node lets you verify your balance without trusting anyone's server. The same sovereignty logic that drives Bitcoiners to run a node and self-host their tools applies directly to custody.
Self-custody is exercised with a hardware wallet and strengthened by multisig and careful coin control.
In Simple Terms
Self-custody means holding the private keys to your own Bitcoin, rather than trusting a custodian such as an exchange to hold them for you. It…