xpub

An xpub is an extended public key from which a hierarchical deterministic wallet derives an unlimited sequence of child addresses without any private key.

A hierarchical deterministic wallet generates all its addresses from a single seed. The extended public key, or xpub, sits at a branch of that tree and can derive every child receiving and change address beneath it, without exposing private keys. This lets a service watch an entire wallet's activity and generate fresh addresses for each payment while keys stay offline. Deriving and monitoring the full address range is essential for exchanges. Our wallet-infrastructure primitives derive addresses from an xpub and aggregate UTXOs and balances across the whole derivation path.