Why, if I said I paid and you say I didn't and I release my side and you don't release yours then although there is not 100% proof you did not get paid it looks shady as hell.
So I can make you look shady by claiming I paid you and releasing my fake side and by definition you couldn't release yours?
It seems you want to transact with people whom you trust and don't trust at the same time.
You trust them to provide the goods/services you pay for, but
you don't trust them not to disclose tx info without your consent.
You could only get away with it once possibly twice before people assume it's you doing the scamming.
Perhaps 3 flags.
1) open and public transactions
2) closed either side can release the transaction information
3) closed both sides have to agree to release the transaction
You would also have to have a way of forcing that. i.e. addresses that begin with 1 are option 1, addresses that begin with 2 are option 2, addresses that begin with a 3 are option 3.
That way when you pay you know what you are getting into. If we really don't trust each other 1 or 2. One is fully public 2 is private but can be released without my consent or knowledge so there is proof for the sender. 3 is private and secure.
-Dave