user8725: I sent bitcoins for the first time to my friend. He has an address 1JkqP4qMvVpQApqyH4m9J4LBdqfFacMKSf 
I chose to send them through my wallet on Bitcoin-QT, but I was interested to check blockchain.info about the transaction as well. 
I see that blockchain.info shows that I sent bitcoins to another address as well! Can anyone explain why it shows that I sent bitcoins (about $30) to the address 1NTyaVoNrQYx2PA5ce7bVmqA6jfmSSkvxU on blockchain.info? I definitely did not send to that address...

This is my Bitcoin-QT client window. It shows the correct transaction amount.


user4708: This is because you did not have a coin that exactly matched the amount you wanted to send to your friend.  So bitcoin had to split a larger coin into 2 coins... 1 with the amount to send to your friend and the rest as "change" to send back to you.  The address you don't recognize is a new address that was created for the change, and it's in your wallet.

8725: <p>I sent bitcoins for the first time to my friend. He has an address 1JkqP4qMvVpQApqyH4m9J4LBdqfFacMKSf </p>

<p>I chose to send them through my wallet on Bitcoin-QT, but I was interested to check blockchain.info about the transaction as well. </p>

<p>I see that blockchain.info shows that I sent bitcoins to another address as well! Can anyone explain why it shows that I sent bitcoins (about $30) to the address 1NTyaVoNrQYx2PA5ce7bVmqA6jfmSSkvxU on blockchain.info? I definitely did not send to that address...</p>

<p><img src="https://i.stack.imgur.com/THq95.png" alt="enter image description here"></p>

<p>This is my Bitcoin-QT client window. It shows the correct transaction amount.</p>

<p><img src="https://i.stack.imgur.com/3HKEF.png" alt="enter image description here"></p>
 4708: <p>This is because you did not have a coin that exactly matched the amount you wanted to send to your friend.  So bitcoin had to split a larger coin into 2 coins... 1 with the amount to send to your friend and the rest as "change" to send back to you.  The address you don't recognize is a new address that was created for the change, and it's in your wallet.</p>
