A crypto wallet address changing every time you receive funds confuses almost every beginner, who often fears the old address has “expired” or that their coins are lost. In reality, this is a deliberate privacy feature of modern wallets, and every address you’ve ever generated still belongs to you. This article explains how these wallets create endless addresses from a single backup, why a fresh address improves your privacy, whether old addresses still work, and how it differs between Bitcoin and Ethereum.