user888: I was wondering the other day how many unspent transaction outputs there are ?
If you just keep track of the unspent transaction outputs you could import private keys, know its balance  and perform spends. How much data is this compared to the full blockchain ?
The biggest downside is that you would not have the full transaction list for a private key/address - just the transactions that you can use for future transaction inputs. 

user208: As of block 177778 (Apr 29, 2012 6:17:33 PM):

2944702 transactions
6904591 transaction outputs
5376092 transaction inputs
1528499 unredeemed outputs left
642432 addresses with non-zero balance


888: <p>I was wondering the other day how many unspent transaction outputs there are ?</p>

<p>If you just keep track of the unspent transaction outputs you could import private keys, know its balance  and perform spends. How much data is this compared to the full blockchain ?</p>

<p>The biggest downside is that you would not have the full transaction list for a private key/address - just the transactions that you can use for future transaction inputs. </p>
 208: <p>As of block 177778 (Apr 29, 2012 6:17:33 PM):</p>

<ul>
<li>2944702 transactions</li>
<li>6904591 transaction outputs</li>
<li>5376092 transaction inputs</li>
<li>1528499 unredeemed outputs left</li>
<li>642432 addresses with non-zero balance</li>
</ul>
