Definition
A watch-only wallet lets a user view balances, transaction history, or receiving addresses without importing the corresponding private keys. It may use a single public address, an extended public key, or another public account description. The exact information available depends on the blockchain and wallet. The displayed balance is not evidence that the observer owns the assets or can withdraw them.
How It Works
A user can monitor a cold-storage account on an internet-connected device while keeping signing keys elsewhere. Some watch-only tools can prepare unsigned transactions, but a separate authorized signer must approve them before spending is possible. This separates observation and transaction preparation from authorization. An address can be watched by anyone when its activity is public; adding it to an interface does not transfer ownership.
Key Considerations
Protect viewing information as well as signing secrets where privacy matters. An extended public key can reveal multiple related addresses and activity that would otherwise be harder to associate. Verify the account description and network so that the display reflects the intended wallet. No legitimate payment or deposit can transform an unrelated watch-only balance into assets you control. Requests to pay an unlock fee for a watched account are a warning sign. If genuine signing credentials are lost, the watch-only interface cannot reconstruct them; recovery requires the wallet’s actual backup or recovery mechanism.