It's not trust, it's uptime. Tor trusts only the directory authorities, not any nodes. A node that is going up and down won't be used much. They can be used as middle nodes, since those are ephemeral.
If it's IP, it will be the incoming IP, not outgoing. You might want a stable central node that routes outgoing traffic to the currently active transient edge node.
You can't move a fingerprint's IP without bringing it down, anyway, because the directory consensus is cached for a while and your node will look down to other nodes until they get the latest one.
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How is that trust anchored? To public IPs or to public keys?
It's not trust, it's uptime. Tor trusts only the directory authorities, not any nodes. A node that is going up and down won't be used much. They can be used as middle nodes, since those are ephemeral.
If it's IP, it will be the incoming IP, not outgoing. You might want a stable central node that routes outgoing traffic to the currently active transient edge node.
You can't move a fingerprint's IP without bringing it down, anyway, because the directory consensus is cached for a while and your node will look down to other nodes until they get the latest one.