How do you escrow goods which cannot be validated?
That Ethereum address containing UTRUST tokens was a good example.
The seller and buyer cannot trust the escrow with both the private key and the public address. The escrow cannot check whether the private key unlocks the public address.
Do not complicate things Try to read the whitepaper and you will be enlightened.
"Enlighten me then"

But seriously read white paper and you will know everything that you should know
Alice sells the private key of her Ethereum wallet to Bob. Bob pays through UTRUST. Alice is notified that the money is in escrow and sends the private key to Bob. Bob claims the key does not work. Alice opens a dispute.
Tell me how the UTRUST Mediator resolves this transaction.
i think, both alice and bob is real scammers, and we need answer from UTRUST dev about this question.
how utrust work