<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>

CC BY-SA 3.0
2013-06-14T22:01:04.870Z
A less time-specific answer to the question "How many unspent transaction outputs are there?" would be appreciated.
Steven Roose
CC BY-SA 3.0
2017-05-13T03:35:29.850Z
@StevenRoose The number isn't fixed, so an answer would have to be "time-specific."
Geremia
CC BY-SA 3.0
2017-05-13T03:37:05.930Z
Where/how did you obtain this info?
Geremia
CC BY-SA 3.0
2017-05-13T17:37:15.820Z
@Geremia [This](https://bitcoin.stackexchange.com/a/35987/4334) shows how.
Geremia
CC BY-SA 3.0
2012-04-29T18:43:04.047Z
Looking at the number of addresses with nonzero balance, an index versus 'list of blocks address has an unspent tx output in' I calculate would be less than 28 MB. It would then be quick to get the blocks from bitcoind and hence the key's transactions.
jim618
CC BY-SA 3.0
2012-04-29T20:59:33.717Z
Would a script that reports these numbers be available anywhere?
Stephen Gornick
CC BY-SA 3.0
2012-04-30T00:53:42.760Z
I calculated it using a patch for bitcoind that scans the blockchain  at startup, not very user-friendly :)
Pieter Wuille
CC BY-SA 3.0
2012-04-29T16:34:36.130Z
2017-05-20T19:27:31.307Z
2017-05-20T19:27:31.307Z
Pieter Wuille
<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>

CC BY-SA 3.0
2017-05-20T21:12:54.173Z
https://blockchain.info/unconfirmed-transactions
abelenky
<utxo-set>
How many unspent transaction outputs are there?
jim618
# How many unspent transaction outputs are there?

(Asked by: username_0 on 2012-04-29)

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.

**Tags:** utxo-set

> **Comments:**
> **username_1**: https://blockchain.info/unconfirmed-transactions  

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## 1 answers

### Answer by username_2 on 2012-04-29. Score: 8 | Accepted answer

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

> **Comments:**
> **username_0**: Looking at the number of addresses with nonzero balance, an index versus 'list of blocks address has an unspent tx output in' I calculate would be less than 28 MB. It would then be quick to get the blocks from bitcoind and hence the key's transactions.  
> **username_5**: Would a script that reports these numbers be available anywhere?  
> **username_2**: I calculated it using a patch for bitcoind that scans the blockchain  at startup, not very user-friendly :)  
> **username_3**: A less time-specific answer to the question "How many unspent transaction outputs are there?" would be appreciated.  
> **username_4**: @username_3 The number isn't fixed, so an answer would have to be "time-specific."  
> **username_4**: Where/how did you obtain this info?  
> **username_4**: @username_4 [This](https://bitcoin.stackexchange.com/a/35987/4334) shows how.  

---

