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Nine addresses
Nine is a lot, and new readers reasonably take it as a sign something is wrong. It is not. Four pages on what the set is for and what it cannot do.
The short version
Almost everything that makes an onion unreachable happens along the path rather than at the destination. Those failures are per address, so several addresses make them independent of each other. That is the whole argument, and it explains why a large set is a design choice rather than a warning sign.
Why nine and not oneA single address is a single point of failure in a very specific way.Keeping your own listSaving new ones is easy. Deleting old ones is the half that protects you.Reading an addressCheck the middle. That is where a forgery differs, and where reading stops.
What is not hereNone of these pages tell you which address is genuine, because a list cannot answer that. Only a signature can, and that is a decision of its own.