Account Number

An account number is a unique identifier used to distinguish one account from another so payments and transfers reach the correct destination. In traditional finance, it is typically a series of digits, sometimes including letters, assigned by a bank to a specific customer account.

In banking, account numbers work alongside other routing details, such as sort codes, ABA numbers, or IBANs, to direct funds through payment networks. Sharing your account number generally lets others send money to you, but it does not by itself authorize withdrawals. Security is enforced by separate authentication methods like passwords, signatures, or bank verification.

In crypto, the closest equivalent to an account number is a wallet address, sometimes described as being derived from a public key. While terminology differs by network, the idea is similar: it is the destination identifier you provide when receiving assets. For example, sending bitcoin requires the recipient’s Bitcoin address, and sending tokens on Ethereum requires an Ethereum address. Some systems also use “account-based” models, where an address represents an account balance, while others use models like Bitcoin’s UTXO approach, where addresses function more like payment destinations than named accounts.

Bank account numbers are issued by institutions and follow standardized formats. Crypto addresses are generated using cryptographic algorithms, and they often include checksum features to reduce the risk of typos. Even so, transactions are typically irreversible, so copying the correct address and matching the correct network is essential. In practice, exchanges may also assign internal “account numbers” for user ledgers, while requiring an on-chain address for deposits and withdrawals.

Understanding account numbers matters because correct identifiers are the foundation of transaction routing, and mistakes or poor security hygiene can lead to misdirected funds or loss across both traditional finance and blockchain systems.