Quote from: toutankhamoun.c on March 06, 2013, 08:27:12 AM

Its a blockchain wallet i didnt import it i ve created it in the site. i ve send coins from an exchanger nd and for watch only i didnt do it .. can do it after ive funded the wallet ? i wont lost the coins if i do that ?

I'm not sure I'm following but let me answer the question I think you are asking.

When you use blockchain.info/wallet, you never need to touch private keys yourself. When you want to receive money it will give you a bitcoin address to use each time you click "New Address". That address will have a private key and can be used for spending.

It is possible to make an existing Bitcoin address into a "watching only" address by going into the Advanced mode and then delete the private key. Or you could simply take any Bitcoin address from anywhere and add it as a watching only address.

So in working with a "watching only" address you are going above and beyond the basic functionality provided by Blockchain.info/wallet. With that comes the necessity to understand when a private key is needed and it appears that is about where your question lies, so it is good that you are asking this question.

When you have a "watching only" address, you cannot spend any funds received to that address unless you have access to the corresponding private key.

So I am thinking that your question is this:

If a watching only address is added now, can that address be used to request payment from others even though it says "watching only?"

The answer to that is yes, as long as you have the private key for it somewhere and that key is kept secure.

The Blockchain.info/wallet can later import private keys. If you add a private key it will look to see if the address already exists. If it does and it is a "watching only" Bitcoin address then Blockchain.info/wallet will simply change the mode for that address so that it is no longer a "watching only" address and store the private key with it. You can then use any funds received to that address for spending.

So as long as you have a private key for a Bitcoin address you can always spend any funds received to that address. The private key is only needed at the time you plan to spend funds at that address. The private key does not necessarily need to be in the Blockchain.info/wallet at the time a payment is received to that "watching only" Bitcoin address.

You can see all the Bicoin address/private key pairs in your Blockchain.info/wallet by clickiing on Import/Export then Paper Wallet.

For any private key, you can use a tool to have it compute the corresponding Bitcoin address. BrainWallet.org generator can do this:
- http://brainwallet.org/#generator <-- Paste your private key, it will show the Bitcoin address.

So if you are seeing a problem reported with a certain address -- firstly a mismatch between private key and Bitcon address shouldn't happen, but just to know a bit more where your problem lies, perhaps check the private key on BrainWallet and ensure that it does indeed provide a Bitcoin address that matches the one shown on the Paper Wallet view.