Check when transaction was added to the mempool?

The getrawmempool interface provides this information in the time field, though it is potentially very slow to respond with a large number of transactions in the mempool. It does not record this time once the transaction is removed from the mempool for non-wallet transactions, so it either needs to be gathered from this interface or recorded on addition with the zmq socket.

"result": {
    "89ee39117b4b55e54ace29c631eef80a875ae109a4fbd79ddd10b6f21329e88d": {
        "size": 225,
        "fee": 0.00000573,
        "modifiedfee": 0.00000573,
        "time": 1556802637,
        "height": 574268,
        "descendantcount": 2,
        "descendantsize": 451,
        "descendantfees": 3247,
        "ancestorcount": 1,
        "ancestorsize": 225,
        "ancestorfees": 573,
        "wtxid": "89ee39117b4b55e54ace29c631eef80a875ae109a4fbd79ddd10b6f21329e88d",
        "depends": [

        ]
    }
}

Anonymous

Posted 2019-05-02T14:32:19.803

Reputation: 10 054

3Doesn't getmempoolentry give the same information? – Pieter Wuille – 2019-05-02T16:16:15.113

I assumed they wanted to do bulk analysis. – Anonymous – 2019-05-02T16:43:46.600

Thank you both, these are the useful commands One clarification though: am I right that once the transaction is confirmed and gone from the mempool- there is no way to check when it was first seen? – Dmitry Laptev – 2019-05-02T19:28:04.210

2Yes, that information is not kept around. In fact, apart from historical blocks (and only when not pruning), nothing at all is kept around about confirmed transactions (in general you can't test whether a particular transaction was confirmed in the past). – Pieter Wuille – 2019-05-02T19:34:38.097

Check when transaction was added to the mempool?

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