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I am interested in figuring out at what height a transaction was mined, but I cannot find the right command to extract this information. Perhaps it's not possible?

My Bitcoin Core was not involved as sender or receiver of the transaction.

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  • Is your Bitcoin Core wallet involved in the transaction (i.e., did it send/receive the transaction, or is it sending to an address created by it)? May 16 at 12:51
  • @PieterWuille. It’s neither. The transaction in question was sent from from a centralized exchange to a non-Bitcoin Core wallet. May 16 at 12:59

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For a transaction that's not considered "yours" by the Bitcoin Core wallet, the only way to learn anything about it is through the optional transaction index.

If you have the transaction index enabled (-txindex on the command line or txindex=1 in the configuration file), you can use the getrawtransaction RPC with a txid to find the transaction in the chain. If you add a true after the txid, it'll also report the transaction in decoded format, along with other information such as the number of confirmations. E.g. you'd run:

bitcoin-cli getrawtransaction f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16 true

and get as response:

{
  "in_active_chain": true,
  "txid": "f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16",
  "hash": "f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16",
  "version": 1,
  "size": 275,
  "vsize": 275,
  "weight": 1100,
  "locktime": 0,
  "vin": ...,
  "vout": ...,
  "hex": "0100000001c997a5e56e104102fa209c6a852dd90660a20b2d9c352423edce25857fcd3704000000004847304402204e45e16932b8af514961a1d3a1a25fdf3f4f7732e9d624c6c61548ab5fb8cd410220181522ec8eca07de4860a4acdd12909d831cc56cbbac4622082221a8768d1d0901ffffffff0200ca9a3b00000000434104ae1a62fe09c5f51b13905f07f06b99a2f7159b2225f374cd378d71302fa28414e7aab37397f554a7df5f142c21c1b7303b8a0626f1baded5c72a704f7e6cd84cac00286bee0000000043410411db93e1dcdb8a016b49840f8c53bc1eb68a382e97b1482ecad7b148a6909a5cb2e0eaddfb84ccf9744464f82e160bfa9b8b64f9d4c03f999b8643f656b412a3ac00000000",
  "blockhash": "00000000d1145790a8694403d4063f323d499e655c83426834d4ce2f8dd4a2ee",
  "confirmations": 732767,
  "time": 1231731025,
  "blocktime": 1231731025
}

If you already know in which block the transaction was confirmed, you can verify it using the same RPC (even without transaction index) by adding the block hash as parameter:

bitcoin-cli getrawtransaction f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16 true 00000000d1145790a8694403d4063f323d499e655c83426834d4ce2f8dd4a2ee

These commands can also be issued in the Bitcoin-Qt debug console.

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  • Fantastic. Thanks. I enabled txindex=1 in the configuration file. However, upon running getrawtransaction [txid] true I am getting the following error: No such mempool transaction. Use -txindex or provide a block hash to enable blockchain transaction queries. Use gettransaction for wallet transactions. (code -5). Any ideas why this could be? May 18 at 18:29
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    Are you sure you downloaded the whole blockchain with txindex=1 ? Because if you've just changed it from 0 to 1, when you will restart Bitcoin Core, it will reindex and download the whole blockchain again. If not, you have to provide the blockhash to tel bitcoin-cli where to look for.
    – mbh86
    May 19 at 13:50

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