Is there a working and reliable escrow that works on the blockchain?
As far as i know there's no reliable escrow that works on blockchain. This could be an opportunity.
If there isn't would you use it if I made one? Image creating escrow smart contacts as per your conditions, neither seller nor buyer wouldn't need to trust each other as well as to pay a fee to third-party escrow service providers (of course creating a smart contract costs money but when chosen the right smart contracts platform you could lower it to a minimum).
Or, kindly recommend one you already are using. Thanks.
I never heard any escrow platform that was using smartcontract for that thing. The question is how reliable the code that implemented in the smartcontract? How can we trust the developer for this? If the smartcontract was not getting any audit and there will always be possibility for back door to be implemented in the contract.
Seller and buyer didn't need to trust each other but they need to trust the code that already deployed. This is the main concern.