[Feature] Allow gettxout to return information for spent outputs #9641

kristovatlas commented at 9:00 PM on January 26, 2017: none

Related: #4007

I'm assuming this is non-trivial to do, but I wish that gettxout could return data for spent outputs. This would allow me to compute, for example, the height at which any transaction was mined. Currently, this is only possible if the transaction in question has one or more unspent outputs due to the current restriction on gettxout.

kristovatlas renamed this:
~~Feature request: Allow gettxout to return information for spent outputs~~
[Feature] Allow gettxout to return information for spent outputs
on Jan 26, 2017

TheBlueMatt commented at 9:02 PM on January 26, 2017: contributor

You can use -txindex and getrawtransaction for this, I believe.

On January 26, 2017 4:00:29 PM EST, Kristov Atlas notifications@github.com wrote:

Related: #4007

I'm assuming this is non-trivial to do, but I wish that gettxout could return data for spent outputs. This would allow me to compute, for example, the height at which any transaction was mined. Currently, this is only possible if the transaction in question has one or more unspent outputs due to the current restriction on gettxout.

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kristovatlas commented at 9:05 PM on January 26, 2017: none

Sadly, no. Here's an example of data you get from getrawtransaction/decoderawtransaction:


{
    "txid": "8131ffb0a2c945ecaf9b9063e59558784f9c3a74741ce6ae2a18d0571dac15bb",
    "version": 1,
    "locktime": 0,
    "vin": [{
            "txid": "efd9cf795917c178a8fdcc21ec668c17b66958d6cfdba9468561927abe0aaf9d",
            "vout": 0,
            "scriptSig": {
                "asm": "3046022100c2f7f25be5de6ce88ac3c1a519514379e91f39b31ddff279a3db0b1a229b708b022100b29efbdbd9837cc6a6c7318aa4900ed7e4d65662c34d1622a2035a3a5534a99a01",
                "hex": "493046022100c2f7f25be5de6ce88ac3c1a519514379e91f39b31ddff279a3db0b1a229b708b022100b29efbdbd9837cc6a6c7318aa4900ed7e4d65662c34d1622a2035a3a5534a99a01"
            },
            "sequence": 4294967295
        },
        {
            "txid": "fbce1a455da4dd974388f22d1241b94f2a63223db16da58d9475f0bd0e3316d5",
            "vout": 0,
            "scriptSig": {
                "asm": "3044022051243debe6d4f2b433bee0cee78c5c4073ead0e3bde54296dbed6176e128659c022044417bfe16f44eb7b6eb0cdf077b9ce972a332e15395c09ca5e4f602958d266101",
                "hex": "473044022051243debe6d4f2b433bee0cee78c5c4073ead0e3bde54296dbed6176e128659c022044417bfe16f44eb7b6eb0cdf077b9ce972a332e15395c09ca5e4f602958d266101"
            },
            "sequence": 4294967295
        },
        {
            "txid": "f9839848709b283623fe171142cd7c1be07c417971e544c3b327129633aaf5e1",
            "vout": 0,
            "scriptSig": {
                "asm": "30440220593252bb992ce3c85baf28d6e3aa32065816271d2c822398fe7ee28a856bc943022066d429dd5025d3c86fd8fd8a58e183a844bd94aa312cefe00388f57c85b0ca3201",
                "hex": "4730440220593252bb992ce3c85baf28d6e3aa32065816271d2c822398fe7ee28a856bc943022066d429dd5025d3c86fd8fd8a58e183a844bd94aa312cefe00388f57c85b0ca3201"
            },
            "sequence": 4294967295
        },
        {
            "txid": "d590fb81a021549e2eb8dd9f65ae6481662f44314848a7e60595121837e807e2",
            "vout": 0,
            "scriptSig": {
                "asm": "3045022067cf27eb733e5bcae412a586b25a74417c237161a084167c2a0b439abfebdcb2022100efcc6baa6824b4c5205aa967e0b76d31abf89e738d4b6b014e788c9a8cccaf0c01",
                "hex": "483045022067cf27eb733e5bcae412a586b25a74417c237161a084167c2a0b439abfebdcb2022100efcc6baa6824b4c5205aa967e0b76d31abf89e738d4b6b014e788c9a8cccaf0c01"
            },
            "sequence": 4294967295
        },
        {
            "txid": "94c366de3e715aaec53e3c442238e6febe37be4dc9b3fa77d9e9a9809d8d3be2",
            "vout": 0,
            "scriptSig": {
                "asm": "3045022020f2eb35036666b1debe0d1d2e77a36d5d9c4e96c1dba23f5100f193dbf524790221008ce79bc1321fb4357c6daee818038d41544749127751726e46b2b320c8b565a201",
                "hex": "483045022020f2eb35036666b1debe0d1d2e77a36d5d9c4e96c1dba23f5100f193dbf524790221008ce79bc1321fb4357c6daee818038d41544749127751726e46b2b320c8b565a201"
            },
            "sequence": 4294967295
        }
    ],
    "vout": [{
            "value": 250.00000000,
            "n": 0,
            "scriptPubKey": {
                "asm": "OP_DUP OP_HASH160 366a27645806e817a6cd40bc869bdad92fe55091 OP_EQUALVERIFY OP_CHECKSIG",
                "hex": "76a914366a27645806e817a6cd40bc869bdad92fe5509188ac",
                "reqSigs": 1,
                "type": "pubkeyhash",
                "addresses": [
                    "15xif4SjXiFi3NDEsmMZCfTdE9jvvVQrjU"
                ]
            }
        },
        {
            "value": 0.01000000,
            "n": 1,
            "scriptPubKey": {
                "asm": "OP_DUP OP_HASH160 ee8bd501094a7d5ca318da2506de35e1cb025ddc OP_EQUALVERIFY OP_CHECKSIG",
                "hex": "76a914ee8bd501094a7d5ca318da2506de35e1cb025ddc88ac",
                "reqSigs": 1,
                "type": "pubkeyhash",
                "addresses": [
                    "1NkKLMgbSjXrT7oHagnGmYFhXAWXjJsKCj"
                ]
            }
        }
    ]
}

TheBlueMatt commented at 9:10 PM on January 26, 2017: contributor

Ahh, so you want to add the mined-at-height to that info? That should be easily doable.

kristovatlas commented at 9:10 PM on January 26, 2017: none

Yes

jonasschnelli commented at 7:48 AM on January 27, 2017: contributor

I think you can... with the REST interface. Just call /rest/tx/<TX-HASH>.json and read out the confirmations attribute. (requires tx index though).

I think we should consider adding a RPC call in blockchain.cpp that is capable of returning a Tx over TxToJSON() (mempool & txindex). getrawtransaction lacks internal non-serialized data.