Bitcoin Forum

http://blockchain.info/tree/8930499

I sent Jake 50 BTC for two 5850s.

He got 51.588 when I sent 50.

I most certainly did not over pay lol I tried to talk him down a BTC or two since the price of BTC went up .30 since we closed our deal.

He thinks its a fee or he thinks I sent it extra to him.  Trying to tell him I am not in this business to give free coins.

Can anyone explain what this is telling us?

Thanks.

Status: 3/unconfirmed, broadcast through 6 nodes
Date: 6/13/2012 11:21
To: Jake 1EKqx63zdoUumUE2NxW9Hfn5yafp2s4fu1
Debit: -50.00 BTC
Net amount: -50.00 BTC
Transaction ID: cbb52f167e10c965778fa7df442a68b0e16bb83ca290596895d36eab63c93eb5

http://blockchain.info/tree/8930499

^^^ Block Chain

Just to clarify, I didn't actually get the extra BTC, I got the 50, I am just wondering why the extra transaction is on this transaction ID

The block chain confirms you sent 50 BTC.  

On edit:
The "extra" tx is the change back to the sender. He only had an input worth 51.588.  In Bitcoin you have to spend an entire input.

Input:
Unspent output worth 51.588

Output:
50 BTC to you
1.588 BTC back to him.

Input - Output = 0 (so no fee to the poor miners)
Input >= Output so tx is valid.


Also tx don't have to be only to one destination.  If he owed you 50 BTC and me 5 BTC he could have made a tx like this:

Input:
Unspent output(s) worth 56.00

Output:
50 BTC to you
5 BTC to me
0.995 BTC BTC back to him.
Total: 55.995 BTC

Input - Output = 0.005 (fee to miners)
Input >= Output so tx is valid.

It's normal - that is a "change" transaction - since an input must be completely spent, the remainder is sent back to the sender's wallet, but to a new 'change' address.

I am just curious as to what this other transaction is. I've only done a couple of transactions and I've never seen something like this before so I am just wondering why it shows another transaction on this ID.

Thanks for the clarification :)

I knew you guys would have an answer for us.

Thanks!