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 The Attestation Provider and the Attestation itself are distinct. 
 Nice! Yeah, it feels like BTC Map can attest for who currenctly controls each place in this PR. We just need to create a new kind with the d-tag equals to the identifier of the place. That event would then have a "result" field with the pubkey of the current owner.

Or maybe the opposite, the event's d-tag is the user and BTC Map lists the locations that user owns.