Does observer-key work like this?

[logxing]

Now we have mutisig.
I think this method is simple than Mail System, doesn't it?

[logxing]

Oh, much nicer   

[xeroc]

As fas as I know, there currently is no such thing as an observer key ... BM told us a few days ago in the dev hangout that there are much nicer plans for the observation of accounts without the privatekeys .. no idea how it is going to work though

[logxing]

1, Claim observer-keypair (write public key to blockchain) by the signature of account. User can off/change observer-key also.

2, Titan transfer for observer mode
"public key of observer-keypair" + "private key of random keypair" ==> public key of sub-address
"public key of sub-address" + "public key of account" ==> mutisig-address

then send money to mutisig-address.

3, I can tell my private key of observer-keypair to the manager of wallet (like blockchain.info).
So they can :
"private key of observer-keypair" + "public key of random keypair" ==> public key of sub-address
"public key of sub-address" + "public key of account" ==> mutisig-address
then tell me my balance of my account( relate with the observer-keypair).
They can not spend it because they have not the private key of account.

4, I can off/change my observer-keypair to take back the right of Observer (future).