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Why a fixed address?
Feeds bury posts. A number on this map stays put while the site runs — even if the keeper changes.
Feeds reshuffle. Domains lapse. A numbered address on Named Atlas stays where it is while the service runs.
Someone can still take the keep if they pay 25% more. The number does not move. You share a coordinate, not a campaign.
You sit among other claimed work, with neighbours and a guestbook, not on an empty profile page.