wsbnever,
I understand that your post was auto-translated to English. I think this can be a major hurdle, because auto-translating complex ideas does not lead to a fruitful conversation.
Nonetheless, let me suggest that you look into OpenTransactions before you plunge into "rolling your own".
Here's how OpenTransaction (OT) meets your characterstics.
1. completely decentralized . System runs on all nodes , can not be turned off.
OT servers can be run as Tor hidden services. In this sense they can't be "turned off" by an attacker.
2. complete privacy. All information exchange should be signed , encrypted , anonymous and can not be tracked.
In OT, only the parties to the transaction and the OT server operator are aware of the transaction happening.
3. asset security . All transactions the system can be signature-locked ,otherwise ths assets should have doubled collateral in the transactions system .
As I understand, you're suggested that each transaction has a collateral posted by both parties. That can be done in OT.
4. arbitration. Tracking system mandatory transaction flow , so that the whole transaction process has produced evidence to support the dispute after the proceedings.
Arbitration is available in OT. I'm working right now on implementing a mechanism in OT which will make it almost 100% certain for an arbiter to ascertain whether or not a buyer has indeed made a bank transfer to the seller.
5. automatically stable. System has a self-stabilizing mechanism to ensure that the total market value of the collateral to be able to run in a stable range .
Sorry, I could not follow what you are saying here. Are you reiterating the collateral idea mentioned in 3.?