A wallet that can monitor funds and build transactions but cannot sign with private keys.
Watch-only wallet meaning
A watch-only wallet imports public information such as addresses, public keys, or descriptors. It can calculate balances, create receive addresses under supported setups, and prepare unsigned transactions without possessing spend-capable secrets.
How it works in Bitcoin
This separation is useful in cold storage. An online coordinator watches the chain and prepares a transaction, while an offline signer verifies and authorizes it. The signed transaction can then return for broadcast.
A simple example
A shop can monitor incoming payments from an internet-connected system while keeping treasury signing keys on offline devices.
Why Watch-only 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
Watch-only data can reveal balances and transaction history. Extended public keys also carry privacy and derivation risks, so they should not be treated as harmless public website data.
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 ↗