Doing business with stranger under condition of the trustlessness

Hi guys
Honestly I cannot take in mind how the blockchain helps us.
let’s consider a simple deal. I have a vase which I am going to sell and I live in Moscow. Li Sun would like to buy it and she is in Beijing.We haven’t known each other before. Obviously we don’t trust each other.
Who should send the asset first ? How can blockchain infrastructure sort this dilemma?
Usually there is a simple answer. People meet at the trading platform and the platform could rate them and keep money unless both are happy. However it is not P2P communication I think because the third party, middle man, is heavily involved. It resolves a conflict, if any, and you must comply.
What do you think?

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@Arie i think its possible only with Defi and smart contracts… :thinking: