Technical Definition
Wallet Fingerprint
A wallet fingerprint is a short identifier derived from key material and used to help identify an HD-wallet key or signing source.
By Crypto University Editorial
BIP-32Extended Public Key (xpub)Signer
✦ Key Insight
It helps hardware wallets and coordinators match derivation information with the correct signer.
✕ Common Misconceptions
A fingerprint is not secret and is not unique enough to serve as strong authentication by itself.
Detailed Explanation
Bitcoin wallet standards often use fingerprints in descriptors and PSBT metadata.
In Practice
“A PSBT coordinator identifies which hardware wallet should sign an input by matching its key fingerprint.”
Dig Deeper
Public Key
The key derived from your private key that others use to verify your signatures and send you funds.
Wallet
Software or hardware that stores your private keys and lets you sign transactions.
Extended Public Key (xpub)
An extended public key can derive a branch of public keys and addresses without exposing the corresponding private keys.