Quick answer
Self-custody means the user controls the keys or signing authority needed to move the assets.
What is Self-custody?
Self-custody places transaction authorization with the user rather than a platform account. It can reduce reliance on a custodian, but it transfers recovery, key security, signing, and error-management responsibilities to the user.
The useful way to approach this term is to separate its definition from the assumptions people often attach to it. In crypto, the same word can appear in a protocol rule, a user interface, a market-data label, or a marketing claim. Check which layer the explanation is describing.
Why does self-custody matter?
There is no universal undo button for a lost phrase, wrong network, or malicious approval. Self-custody is a control model with responsibilities, not a badge that automatically makes funds safer.
Concrete example
See it in a real situation
A user holds a hardware wallet and keeps the recovery phrase offline. The user must still verify addresses, update the device safely, and plan recovery without disclosing the phrase.
Common misconceptions
What this term does not mean
- Self-custody does not mean the user controls the blockchain’s rules.
- Keeping keys yourself does not eliminate smart-contract, market, bridge, or device risks.
Related terms
Sources and further reading
Definitions are written for education and checked against the sources below where relevant. A source can explain a protocol or rule without endorsing every product built around it.