<p>No.</p>

<p>The miners use Bitcoin Core or similar full node software to determine which transactions are valid and suitable for inclusion in a block.  Bitcoin Core maintains a database of all unspent UXTOs.  This database is constructed when the node first downloads the blockchain and is updated as new blocks and transactions arrive.  It's random access and any transaction, regardless of age, can be found by its ID in a very short time.</p>

CC BY-SA 3.0
2017-05-13T03:11:29.160Z
How many unspent UXTOs are there currently?
Geremia
CC BY-SA 3.0
2017-05-13T04:09:05.940Z
@Geremia: See https://bitcoin.stackexchange.com/questions/35980/how-big-is-the-utxo-database.  I don't have a full node running to get a current figure.
Nate Eldredge
CC BY-SA 3.0
2017-02-03T02:00:26.573Z
2017-02-03T02:00:26.573Z
Nate Eldredge
<p>Suppose I do a transaction with an UXTO created years ago. Would that take longer to confirm because miners would have to look further back in the transaction chain to verify it?</p>

<unconfirmed-transactions><confirmations><utxo>
Do transactions with old UTXOs take longer to confirm?
Geremia
# Do transactions with old UTXOs take longer to confirm?

(Asked by: username_0 on 2017-02-03)

Suppose I do a transaction with an UXTO created years ago. Would that take longer to confirm because miners would have to look further back in the transaction chain to verify it?

**Tags:** unconfirmed-transactions, confirmations, utxo


---

## 1 answers

### Answer by username_1 on 2017-02-03. Score: 5 | Accepted answer

No.

The miners use Bitcoin Core or similar full node software to determine which transactions are valid and suitable for inclusion in a block. Bitcoin Core maintains a database of all unspent UXTOs. This database is constructed when the node first downloads the blockchain and is updated as new blocks and transactions arrive. It's random access and any transaction, regardless of age, can be found by its ID in a very short time.

> **Comments:**
> **username_0**: How many unspent UXTOs are there currently?  
> **username_1**: @username_0: See https://bitcoin.stackexchange.com/questions/35980/how-big-is-the-utxo-database.  I don't have a full node running to get a current figure.  

---

