How does a hidden Tideturner chain resolve, and does it go onto the chain as a champion permanent?

Ruling: Permanents (including champions like Tideturner) do create and go on chains, but upon finalizing they immediately resolve without any reactions possible.

Sequence:

• Tideturner is played and goes on the chain
• Upon finalizing, Tideturner resolves immediately without reactions
• Tideturner's "When you play me" trigger happens immediately after the permanent resolves
• This trigger creates a new chain (or adds to an existing one)
• You declare a unit at a different location than Tideturner's
• Reactions can now be played to this trigger
• When the trigger resolves, both the target and Tideturner are moved simultaneously

Nuances:

• The permanent itself resolves without reactions, but its triggered ability can be reacted to
• Tideturner has a card errata requiring the target to be at a different location than Tideturner's location