Setting up a basic self-custody cryptocurrency wallet (such as MetaMask or Trust Wallet) generally does not require a traditional bank account because the software generates a decentralized cryptographic key pair independently. However, if you want to purchase digital assets using fiat currency (like USD or INR), centralized exchanges or on-ramp providers require a linked bank account, debit card, or credit card to fund the initial purchase. Thus, while a bank account is not strictly required to hold or transfer crypto within a wallet, it is practically necessary to convert traditional fiat money into digital tokens.