An address and a password. We send a link to the address, and following it is what lets the account sign in.
Where the confirmation link goes, and what you will sign in with. One account per address.
Ten characters or more, up to two hundred. No required digit, symbol, or mixture of cases — length is what helps. A password on the list of the hundred thousand most common is refused, so a passphrase of a few unrelated words beats a short one with punctuation in it.
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