> ## Documentation Index
> Fetch the complete documentation index at: https://rexrex.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Find Duplicate Sender Nonces

> Find same-sender, same-nonce transaction conflicts in the txpool.

Use `txpool duplicates` to find same-sender, same-nonce transaction groups in the pool.

These groups represent conflicts that matter during [Replacement](/docs/txpool/replacement) experiments or other same-account nonce races when the node exposes more than one transaction for that nonce in `txpool_content`.

## Command

```sh theme={null}
rex txpool duplicates
```

## Example Output

No conflicts:

```text theme={null}
TXPOOL DUPLICATES

Groups: 0

No same-sender, same-nonce conflicts found.
```

Example conflict:

```text theme={null}
TXPOOL DUPLICATES

Groups: 1

Sender: 0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266  Nonce: 2  Txs: 2
STATUS     NONCE    TYPE         FEE BID            SENDER                                       HASH
queued     2        eip-1559     1.000 gwei         0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266   0xaaa...
queued     2        eip-1559     1.200 gwei         0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266   0xbbb...
```

## Why This Can Be Empty

Many normal replacement attempts do not leave two transactions in the local txpool. The node may reject the candidate, or accept it and evict the older transaction. In both cases there is no duplicate group left to display.

When duplicate groups do appear, they are useful for studying transaction replacement and nonce competition behavior.


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