Address Book

Overview

A crypto address book associates a human-readable label with a blockchain address and, ideally, its network, asset context, and any required memo or destination tag. It reduces repetitive data entry and can lower the risk of copying an outdated or incorrect destination.

Because blockchain transfers are usually difficult or impossible to reverse, an address book should be treated as security-sensitive data. An attacker who changes a saved withdrawal address can redirect future payments even when the user carefully selects the expected label. Strong implementations therefore protect address changes with authentication, approval rules, notifications, waiting periods, or withdrawal allowlisting.

Address books can also create false confidence. A saved address may remain syntactically valid while the recipient changes custody providers, stops using the network, or requires a new routing identifier. Users should confirm material transfers through an independent channel, especially after a recent address change.

The feature is distinct from an on-chain naming service. An address book is generally local to a wallet or platform account, while a naming service resolves a shared name according to its own registry rules. Both ultimately need to produce a correct network-specific destination.

Well-designed address books maintain change history and clearly distinguish personal contacts, exchange deposits, treasury accounts, and smart contracts. They may also record when an address was last verified and whether it is approved for a specific asset or transaction limit.

Address books improve convenience, but they can preserve outdated information. Exchanges sometimes change deposit arrangements, and a recipient may move to a new wallet or network. High-value transfers should therefore include an independent confirmation step, especially after a recent edit. Organizations can strengthen the feature with multi-person approval, notifications, and a waiting period before a newly added destination becomes usable.