Of course in the real world there would need to be some way to prevent "predatory" offers (where the "buyer" can't or won't actually close the deal if you accept the offer) but that seems solvable to me. You may have to put down a non-refundable deposit or escrow the sale price, etc.
So it might be better to establish a prediction market for any such asset that settles on the owner of the asset on, say, a quarterly basis. Instead of predicting the value of the asset, it predicts the owner of the asset at a particular price level. Instead of presenting the current owner with a bid directly, ownership transfers and tax payments would be handled exclusively through the market platform.
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That said, this is all getting pretty complex.
Y’all underestimate the number of people with enough money to screw someone (or everyone) over just because they can.
Like when someone made a phoney valuation for a web site at $44B.
If I had to propose a mechanism, I'd suggest using prediction markets instead.