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Testnet: this chain resets when the protocol changes. Funds have no value.
The passkey on this device, your phone or your security key signs you in. You don't type your account id.
If your browser lists several
The passkey you made with your wallet is called “Zapp account”, and so is any passkey from before the chain last reset. A backup key carries your account id as its name. If one finds no account, try the next.