testPsbtTrustlessSwap root asset mismatch

[youngzhenhao]

Hi, When I run this code:

taproot-assets/itest/psbt_test.go

Line 2362 in 331ac78

resp, err = bob.CommitVirtualPsbts(

My bobVPsbt has 2 outputs(0 to bob and 1 back to alice), then this error returns:

rpc error: code = Unknown desc = unable to create proof suffix for output 0 of vPSBT 0: root asset mismatch

It looks like come from here:

taproot-assets/proof/append.go

Line 191 in 331ac78

return nil, fmt.Errorf("root asset mismatch")

How could I solve this?

[guggero]

You mean without changing any code? Or did you change anything? What commit are you on?

[youngzhenhao]

I’d like to utilize PSBT to enable pending buy and sell orders for an exchange on the Bitcoin mainnet.

[guggero]

Yeah, I understand that. But why do you want 2 inputs? Will it always be 2 inputs? Or are you just trying to make this more generic?

[youngzhenhao]

No, the contrary. There should only be one asset output. But you can spend multiple inputs, if you have smaller UTXOs. But you cannot split the outputs for this to work, so there should only be one. I mean on the asset level.

Yes, I'm just trying to make this more general. When I want to sell an asset, I’d like to create a single trade to sell it all, without needing to generate a PSBT for each individual UTXO.

[shuishihang]

@guggero I'm having the same issue. Is there any itest reference available?

[guggero]

I didn't get around to looking into this. Basically because of the sighash flags used, there is a direct correlation between the inputs and outputs. So things need to be adjusted based on the number of inputs there are.

@shuishihang not sure what you mean by "itest reference"?