Confidential pegin output not showing in 2FA Green Wallet

[levantah]

Description

There was a confidential peg-in transaction on Liquid recently and one of its outputs was sent to a 2FA 2-of-2 address on Green Wallet. It is not showing there.

Version

4.0.30 on Android, 2.0.7 AppImage on Linux

Steps to reproduce

1. Make a "MULTISIG / 2OF2" account and generate a new address there. This will be ADDR2 later.
2. Call elements-cli getpeginaddress and send some bitcoin to that address. We will refer to this address as PEGINADDRESS later and to the claimscript as CLAIMSCRIPT.
3. Call elements-cli -stdin createrawtransaction with following input:

[{"txid":"UBLINDED","vout":UBLINDEDVOUT},{"txid":"PEGIN","vout":PEGINVOUT,"pegin_bitcoin_tx":"HEX_TX","pegin_txout_proof":"HEX_PROOF","pegin_claim_script":"CLAIMSCRIPT"}]
[{"ADDR1":ADDR1_AMT},{"ADDR2":ADDR2_AMT},{"fee":FEE}]

Where the capitalized variables mean following:

• Inputs:
  • an unspent transaction which was sent blinded
    • UBLINDED is an unspent Liquid transaction ID
    • UBLINDEDVOUT is the vout of used Liquid UTXO
  • a pegin
    • PEGIN is the Bitcoin transaction ID which sends an output to PEGINADDRESS
    • PEGINVOUT is the exact output index going to PEGINADDRESS
    • HEX_TX is the raw full hex of the transaction itself
    • HEX_PROOF is a hex-encoded proof that PEGIN transaction was included in a block
    • CLAIMSCRIPT was obtained above in step 2
• Outputs:
  • a confidential address that receives part of the inputs
    • ADDR1 receives ADDR1_AMT
  • a confidential address that receives the rest of the inputs minus fee
    • ADDR2 receives ADDR2_AMT
  • a non-confidential fee
    • FEE is the fee denominated in whole coins like all the other amounts here (e.g. 0.00000123 would be 123 sat fee)

Sum of the amounts (not explicitly written in the input but known) is the SUM.

SUM = ADDR1_AMT + ADDR2_AMT + FEE

After createrawtransaction also pipe the hex output to blindrawtransaction and consequently to signrawtransactionwithwallet from which output the .hex is to be broadcast.

Expected behaviour

I would expect Blockstream Green wallet to show the amount received to 2FA address. Same like Aqua Wallet shows similar output (coming from a blinded pegin transaction) to its 1of1 wallet.

Actual behaviour

The incoming transaction is not even shown in the wallet.

Screenshots

$ elements-cli gettxout caeb8e3703b8a1665c718b9426c91cf342c1d285fcc1693588ddc369009c4614 1

{
  "bestblock": "85ad26d9a8a062e2e3a0dc6e6401940e92761f3186de0c689a8234e7b5b96f2f",
  "confirmations": 2138,
  "valuecommitment": "08c33dee6a5d5535eeae17cd9c600c2be4458f87d123fc1d101c22d2d454aae9db",
  "assetcommitment": "0a0bab251a5d4a422af1818479810b08709bf59506eeb36468b52843fb4b1dfeab",
  "commitmentnonce": "",
  "scriptPubKey": {
    "asm": "OP_HASH160 644bb0b401a097c97d4e84e74e2a1a0bb38f3c84 OP_EQUAL",
    "desc": "addr(GrKqeUAzg1M2ZxHxgqtsUsYGLPaSJXxbVf)#0ng55r69",
    "hex": "a914644bb0b401a097c97d4e84e74e2a1a0bb38f3c8487",
    "address": "GrKqeUAzg1M2ZxHxgqtsUsYGLPaSJXxbVf",
    "type": "scripthash"
  },
  "coinbase": false
}

Device or machine

Android 11 smartphone running Blockstream Green wallet v4.0.30

Linux x86_64 Ubuntu running latest BlockstreamGreen-x86_64.AppImage (2.0.7)

Additional info

Sending an output to a clear 1of1 address in Blockstream Green wallet was not tried yet.

[levantah]

ElementsProject/elements#1325

[levantah]

Quoting from a related Tweet for record here:

Hello @Blockstream ! Here see that I have the address on @BlksGreenWallet
and The @Liquid_BTC funds are not showing. … https://liquid.network/address/GrKqeUAzg1M2ZxHxgqtsUsYGLPaSJXxbVf