Thank you for your reply, your opinion is appreciated.
My first question to this would be why we need an escrow agent at all in this scheme. He has no power and doesn't do anything that the buyer or seller couldn't do.
You doesn't, if you are capable to perform such transaction (this will be great).
My second question is what happens if the seller is a scammer, and doesn't send any coins in step 3? The buyer has just lost 2x his coins and has no chance of getting them back if the scammer doesn't cooperate. The scammer can make a transaction paying 1.9x coins to himself and 0.1x coins to the buyer. The buyer has to choose between signing the transaction and getting 0.1x coins back or not signing it and getting 0 coins back.
This scheme
was modified, but I have not edited this post (
done). Actually, step 2 and 3 was combined in one, so the buyer and seller funds are sent to the MultiSig address at the same time and in the
same transaction.