A cryptocurrency address is a unique alphanumeric string that functions as your public identifier on a blockchain — the equivalent of a bank account number. When someone wants to send you cryptocurrency, they send it to your address. Addresses are derived from your public key through a cryptographic hashing process, and each blockchain has its own address format. Bitcoin addresses start with 1, 3, or bc1; Ethereum addresses start with 0x; Solana addresses are base-58 encoded strings of around 44 characters. Addresses are case-sensitive on some networks (Ethereum) and not others (Bitcoin).
Key address concepts: One wallet, many addresses — modern HD (hierarchical deterministic) wallets can generate billions of unique addresses from a single seed phrase, and it is best practice to use a new address for each transaction for privacy reasons. Address reuse risks — reusing the same address links your transaction history publicly on the blockchain, reducing privacy. No recovery for wrong-network sends — sending ETH to a BTC address, or ERC-20 tokens to the wrong network (e.g. sending on BSC when Ethereum was intended), typically results in permanent loss. Always double-check the network and address before sending.
Always verify addresses by checking the first and last 4–6 characters — clipboard-hijacking malware exists that replaces copied addresses with attacker-controlled ones mid-paste. Hardware wallets display the address on-device for confirmation, eliminating this attack vector.
Example: A Bitcoin address: bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh. An Ethereum address: 0x71C7656EC7ab88b098defB751B7401B5f6d8976F. Always use QR codes or verified copy-paste when sending large amounts.
Learn more: Coinbase — What is a Crypto Address?
