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I would like to prove that a certain transaction was in the mempool on a certain date before it got replaced via RBF with another transaction. Is there any service that provides this data?

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  • 2
    Don't know about any service, but if you are running with debug=mempool you can grep your debug.log for replacing tx <original txid>.
    – darosior
    Jul 23 at 12:17
  • I'm assuming you don't want to prove it e.g. cryptographically?
    – 0xb10c
    Jul 23 at 14:09
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I would like to prove that a certain transaction was in the mempool on a certain date before it got replaced via RBF with another transaction.

Consider Tx de8ba282831c6d645aa777a35a5b9f2107cbd96913a9cd4c5880420db092e399 as an example.

gettransactionin Bitcoin Core returns:

"time": 1615601043,
"timereceived": 1615601043,
"replaced_by_txid": "f77e6928c1c12bc91858c95b32dab1e493b24cdf3e19c02372aa11e6dc5ec3c9",

Time of this tx: Saturday, March 13, 2021 2:04:03 AM

Got replaced by another tx on: Saturday, March 13, 2021 2:04:11 AM

I am not sure but maybe this information is only available for transactions that belong to your wallet because no other RPC returns replaced_by_txid.

Is there any service that provides this data?

Couldn't find such information in any of the famous bitcoin explorers. Best I could find was one explorer that shows invalid type for tx which got replaced:

https://tbtc.bitaps.com/de8ba282831c6d645aa777a35a5b9f2107cbd96913a9cd4c5880420db092e399

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  • I think it doesn't correctly answer the question as the OP asks about "a transaction from my mempool" and gettransaction is only about transactions from our wallet.
    – darosior
    Jul 23 at 12:15
  • 1. gettransaction is only for wallet transactions which is the only RPC that returns replaced_by_txid so it's not possible to check if Tx2 transaction was replacement for Tx1 2. OP is looking for a certain transaction that "was in the mempool" but "got replaced". Got replaced = Got included in block or again replaced until confirmed.
    – Prayank
    Jul 23 at 12:46

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