In Web3 wallets, chain ID — not network name — is the only reliable identifier

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A developer setting up their first Web3 session discovered that searching 'Sepolia' in a wallet extension returned over 20 similarly named testnets, all belonging to different blockchain networks. Because network names are not unique in Web3 wallets, selecting the wrong entry can send funds to an entirely unintended chain. The only reliable way to identify the correct network is by its chain ID — a fixed number that has exactly one match; for the Sepolia testnet, that number is 11155111. The same principle applies more broadly: wallet addresses, not display names, are the true identifiers for recipients, and chain IDs, not labels, are the true identifiers for networks. The author also noted that some Sepolia faucets require existing mainnet ETH to function, recommending Alchemy's faucet as a no-prerequisite alternative for beginners.

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