xpub (Extended Public Key)
An extended public key is a master public key in an HD wallet that can derive all the public keys and addresses in the wallet's hierarchy.
Xpubs are commonly shared for watch-only wallet monitoring, payment tracking, and accounting. While xpub sharing is a privacy concern today (it reveals all your addresses to whoever has it), in a post-quantum world it could become a security concern, as the derived public keys could potentially be targeted by a CRQC. Treat xpubs as sensitive information.
An extended public key is a master public key in an HD wallet that can derive all the public keys and addresses in the wallet's hierarchy.
Frequently Asked Questions
What is xpub?
An extended public key is a master public key in an HD wallet that can derive all the public keys and addresses in the wallet's hierarchy.
Why does xpub matter for Bitcoin?
Xpubs are commonly shared for watch-only wallet monitoring, payment tracking, and accounting. While xpub sharing is a privacy concern today (it reveals all your addresses to whoever has it), in a post-quantum world it could become a security concern, as the derived public keys could potentially be targeted by a CRQC.
What are the security implications of xpub?
Treat xpubs as sensitive information.
