A service balance where another party controls the keys used to move the bitcoin.
Custodial wallet meaning
A custodial wallet gives the user an account claim while the provider controls the private keys. Many exchanges and payment apps work this way. The interface may look like a wallet, but an internal transfer can occur entirely inside the provider's database.
How it works in Bitcoin
The custodian handles key storage, transaction construction, and recovery. In return, the user depends on its solvency, security, withdrawal rules, identity checks, legal environment, and operational availability.
A simple example
When an exchange shows a 0.1 BTC balance, that does not necessarily correspond to one dedicated on-chain output. The exchange may pool customer funds and owe 0.1 BTC under its account terms.
Why Custodial wallet matters
Wallet terms describe key control, signing and recovery rather than coins stored inside an application. The distinction becomes critical during backup or device failure.
What people often get wrong
Two-factor authentication protects an account login, not an on-chain private key held by the provider. A custodial balance and self-custodied bitcoin have different failure modes.
Quick checks before using the term
- Who controls the spending keys?
- How would recovery work after a lost device?
- Has the backup been tested without exposing it?
Apply these questions to the concrete example above. A precise answer is more useful than repeating the definition without naming the actor, rule or failure path.
Check the primary reference
This entry is written in plain English, but the technical source is available when you need exact protocol detail.
Bitcoin Developer Guide: Wallets ↗