user836: I have a question concerning the transaction of bitcoins. If, for example, I send some BTC to a specific address, does the receiver have any chance in verifying that I have already sent the BTC, before they are being registered in his wallet? I know there is http://blockexplorer.com/, where I can look the transactions up. But is there any functionality for it in the Bitcoin-Client, which I could use in RPC-Calls?
Use case for this: Assume there is an application that uses Bitcoin via RPC-Calls to the Client. I want to buy something via the application and the seller should be able to see that I paid the correct amount of BTC without having to wait for the transaction to be finally redeemed in his client.
Thanks in advance!

user403: The client will often know about received transactions seconds after they have been sent. Transactions that have not gotten into a block yet are said to have 0 confirmations. You can see them by adjusting the parameters of listreceivedbyaddress, etc. so that they show 0-confirmation transactions.

836: <p>I have a question concerning the transaction of bitcoins. If, for example, I send some BTC to a specific address, does the receiver have any chance in verifying that I have already sent the BTC, before they are being registered in his wallet? I know there is <a href="http://blockexplorer.com/" rel="nofollow">http://blockexplorer.com/</a>, where I can look the transactions up. But is there any functionality for it in the Bitcoin-Client, which I could use in RPC-Calls?</p>

<p>Use case for this: Assume there is an application that uses Bitcoin via RPC-Calls to the Client. I want to buy something via the application and the seller should be able to see that I paid the correct amount of BTC without having to wait for the transaction to be finally redeemed in his client.</p>

<p>Thanks in advance!</p>
 403: <p>The client will often know about received transactions seconds after they have been sent. Transactions that have not gotten into a block yet are said to have 0 confirmations. You can see them by adjusting the parameters of <em>listreceivedbyaddress</em>, etc. so that they show 0-confirmation transactions.</p>
