Looks for the datum hash presence in the mempool.
## Request Structure
`JSON object:`
```JSON
{
"method": "mempool",
"subcommand": ["check"],
"arguments": {
"net": "network_name",
"chain": "chain_name",
"datum": "datum_hash"
},
"id": "1"
}
```
`Parameters:`
**`net (network_name)`** - name of the Cellframe Network. The list of networks can be found in the `<Config_dir> \ etc \ network` folder or received using - [[Node Command - NET LIST]]
**`chain`** - the name of chain (`main` or `zerochain`) `optional`
**`datum`** - hash of the datum
### Curl Example
`Request:`
```actionscript
curl --unix-socket /opt/cellframe-node/var/run/node_cli -X POST http://localhost/connect -d '
{
"method": "mempool",
"subcommand": ["check"],
"arguments": {
"net": "Backbone",
"datum": "0x71334188E13A94D50D45961CF4DA739BE4045CA01AE79CA787532AADDDFACCA4"
},
"id": "1"
}'
```
`Response:`
```json
{
"type": 2,
"result": [
{
"hash": "0x71334188E13A94D50D45961CF4DA739BE4045CA01AE79CA787532AADDDFACCA4",
"net": "Backbone",
"chain": "main",
"find": true,
"source": "mempool",
"datum": {
"Datum": {
"first transaction": "",
"hash": "0x71334188E13A94D50D45961CF4DA739BE4045CA01AE79CA787532AADDDFACCA4",
"tx created": "Thu, 24 Apr 2025 15:49:32 +0700",
"token ticker": "",
"ITEMS": [
{
"item type": "IN",
"Tx prev hash": "0x59FA146BDFBF34F2ACB9D6B93346F3B241AF1729E7A22CA567067A692EEB1B8E",
"Tx out prev idx": 2
},
{
"item type": "OUT",
"Coins": "14.898",
"Value": "14898000000000000000",
"Address": "Rj7J7MiX2bWy8sNyWy27HUx2kbDhinuuQ9L9JGMC9sKpjhB3FsnMvvGq9TKsdVULkGPAoAtFZzcHhMmdZCbCFKTXJRqgMdhcfSnQDyLY"
},
{
"item type": "OUT",
"Coins": "0.002",
"Value": "2000000000000000",
"Address": "Rj7J7MiX2bWy8sNyX38bB86KTFUnSn7sdKDsTFa2RJyQTDWFaebrj6BucT7Wa5CSq77zwRAwevbiKy1sv1RBGTonM83D3xPDwoyGasZ7"
},
{
"item type": "SIG",
"Type": "sig_dil",
"Public key hash": "0xC95D4B79D94523D9C42A38C72C9AF901537CCAB7C18766A7670142E8D01299EF",
"Public key size": 1196,
"Signature size": 2096,
"Sender addr": "Rj7J7MiX2bWy8sNyacCvwxRtX7jYLUUXRUufSxdbJwd4CksRYuhfbsEuvar4Htv28p7Vt9vszdgTHFtaEJ7RUqWPt3J8RxJBZTMGDPao"
}
]
}
}
}
],
"id": 1
}
```