same input added twice to PSBT

[nicbus]

Using this branch of rgb-sandbox and trying to execute a transfer that needs to spend two allocations from the same UTXO, the PSBT ends up containing the same input twice.

The unspents before the transfer come up as:

Height     Amount, ṩ    Outpoint
bcrt1prsq0tuu06w0r8sp28y0tayfryfa5r378r2ewgh5klmdfky245hps9x0wcd        &9/0
105        100000000    5be9f41b47f59fa5f7754cf43dc093b0677585438fdb22d0465ece403a23b2bb:0

bcrt1ptu25fk6a7plumpxmu9tea8uyhq2yr8e00ljpeerlrjs23davn20ss50hrf        &9/1
107        100000000    d6c7f57ff8bd18496af46c3166f5692a9f96e0fcda802c4c62b41febe34d96e7:1

The vin section of the PSBT contains:

    "vin": [
      {
        "txid": "5be9f41b47f59fa5f7754cf43dc093b0677585438fdb22d0465ece403a23b2bb",
        "vout": 0,
        "scriptSig": {
          "asm": "",
          "hex": ""
        },
        "sequence": 0
      },
      {
        "txid": "5be9f41b47f59fa5f7754cf43dc093b0677585438fdb22d0465ece403a23b2bb",
        "vout": 0,
        "scriptSig": {
          "asm": "",
          "hex": ""
        },
        "sequence": 0
      }
    ],

Trying to broadcast the transaction (via bitcoind sendrawtransaction) fails with the bad-txns-inputs-duplicate error.

This might be worth looking into together with #13, which is also about input selection.

[dr-orlovsky]

No, this is unrelated to #13. It seems the issue is in RGB wallet and not in BP wallet. @nicbus can you please open the same issue and copy-paste this content into https://github.com/RGB-WG/rgb?

[dr-orlovsky]

Actually we already have it there: RGB-WG/rgb#117

[dr-orlovsky]

Closing it here since it is referenced from RGB wallet issue