Sweep Taproot and native Segwit v0 coins in a single transaction using Bitcoin Core wallet

Question

My goal

Learn how to send an imported tr(wif) and wpkh() utxo in the same transaction.

What I've tried

I imported a WIF utxo containing a v1 segwit utxo.

bitcoin-cli importdescriptors '[{"desc":"tr(wifkey)#checksum", "timestamp":unixts}]'

I didn't know the checksum, but when importing I got an error that told me what the checksum should be, so I used that.

The balance showed up after import, I assume it was imported correctly.

Learned createrawtransaction, fundrawtransaction, signrawtransactionwithwallet are not acceptable for taproot. This was resulting in "Witness program was passed an empty witness".

It seems psbt commands are more appropriate. However, I couldn't figure out how to successfully sign with cli. I kept getting "complete": false returned.

I then tried bitcoin-qt and attempted to sweep funds to an address as a test. I received this:

While using bitcoin-cli and running bitcoin-cli listunspent I see:

[
  {
    "txid": "TX_1",
    "vout": x,
    "address": "ADDR_1",
    "label": "xxx1",
    "scriptPubKey": "44_LEGNTH_HEX_STRING",
    "amount": xxxxxx.xxxxxx,
    "confirmations": xxx,
    "spendable": true,
    "solvable": true,
    "desc": "wpkh([FINGERPRINT/84'/0'/0'/0/0]KEY)#CHECKSUM1",
    "parent_descs": [
      "wpkh(xpub_key/84'/0'/0'/0/*)#CHECKSUM-parent"
    ],
    "safe": true
  },
  {
    "txid": "TX_2",
    "vout": xx,
    "address": "ADDR_2",
    "label": "xxx2",
    "scriptPubKey": "68_LENGTH_HEX_STRING",
    "amount": xxxxxx.xxxxxx,
    "confirmations": xxxx,
    "spendable": true,
    "solvable": true,
    "desc": "tr([FINGERPRINT2]KEY2)#CHECKSUM2",
    "parent_descs": [
      "tr(KEY2)#CHECKSUM2"
    ],
    "safe": true
  }
]

Output sanitized

Question

• What are the methodical steps starting with an imported WIF/taproot utxo + wpkh utxo and creating a signed tx to send funds?

Answer 1

Regularly you'd use walletcreatefundedpsbt and then walletprocesspsbt. But since you've only got two coins in your wallet that you want to sweep you can simply use sendall.

Let's walk through a reproduction of your scenario. I've created two regtest-WIF-encoded private keys:

• cRZ9wuYhwKYm82rXfSk9hhc9beJy6p7rV4y3aoAdzqFD6YAUVQcJ (corresponding to 029d759b09cec94b6f2bd322cedd5d136e7f24a4936998fe24da09827d8a12e9dd)
• cVFkDn9fS1rwU1SR7geC3rgoGNXLpZXsnrCq2gutYVsGA2FoLpCD (corresponding to 03bd0d0b820dae844107803c9323fe73e81b9adf8abe329930ae9311dab6c3573e)

I'm creating a new wallet and importing a tr() and wpkh() descriptor.

$ bitcoin-cli -regtest createwallet repro_stackexchange
{
  "name": "repro_stackexchange",
  "warning": ""
}
$ bitcoin-cli -regtest -rpcwallet=repro_stackexchange importdescriptors '[{"desc":"tr(cRZ9wuYhwKYm82rXfSk9hhc9beJy6p7rV4y3aoAdzqFD6YAUVQcJ)#uj39yr2v","timestamp":"now"},{"desc":"wpkh(cVFkDn9fS1rwU1SR7geC3rgoGNXLpZXsnrCq2gutYVsGA2FoLpCD)#nayxphlw","timestamp":"now"}]'
[
  {
    "success": true
  },
  {
    "success": true
  }
]

Now i'm sending a coin to each descriptor:

$ bitcoin-cli -named -regtest -rpcwallet=main sendtoaddress address=bcrt1ps66a3wss3l0ay0agnkd57cfu6qrw26z632e0kez0ppjzkyaq0vhskxlrvs amount=0.00042 fee_rate=1
b2e975dee4ab0c68748e85fc847d7ef3fef44f53ee95e4765b1cc2b2c33939d2
$ bitcoin-cli -named -regtest -rpcwallet=main sendtoaddress address=bcrt1q9vsfxgf4t3wmtj9429g539txyv4p2qnuak03sv amount=0.00043 fee_rate=1
e34a3b8116f328d2b1529134dfcc795fbe27eae3991eeb017bc582879cb73b81

We can see that the reproduction wallet got the two coins:

$ bitcoin-cli -regtest -rpcwallet=repro_stackexchange listunspent 0
[
  {
    "txid": "e34a3b8116f328d2b1529134dfcc795fbe27eae3991eeb017bc582879cb73b81",
    "vout": 0,
    "address": "bcrt1q9vsfxgf4t3wmtj9429g539txyv4p2qnuak03sv",
    "label": "",
    "scriptPubKey": "00142b209321355c5db5c8b55151489566232a15027c",
    "amount": 0.00043000,
    "confirmations": 0,
    "ancestorcount": 1,
    "ancestorsize": 130,
    "ancestorfees": 130,
    "spendable": true,
    "solvable": true,
    "desc": "wpkh([2b209321]03bd0d0b820dae844107803c9323fe73e81b9adf8abe329930ae9311dab6c3573e)#k6qfdnw5",
    "parent_descs": [
      "wpkh(03bd0d0b820dae844107803c9323fe73e81b9adf8abe329930ae9311dab6c3573e)#45n94hja"
    ],
    "safe": false
  },
  {
    "txid": "b2e975dee4ab0c68748e85fc847d7ef3fef44f53ee95e4765b1cc2b2c33939d2",
    "vout": 1,
    "address": "bcrt1ps66a3wss3l0ay0agnkd57cfu6qrw26z632e0kez0ppjzkyaq0vhskxlrvs",
    "label": "",
    "scriptPubKey": "512086b5d8ba108fdfd23fa89d9b4f613cd006e5685a8ab2fb644f08642b13a07b2f",
    "amount": 0.00042000,
    "confirmations": 0,
    "ancestorcount": 1,
    "ancestorsize": 154,
    "ancestorfees": 154,
    "spendable": true,
    "solvable": true,
    "desc": "tr([caa3ae90]9d759b09cec94b6f2bd322cedd5d136e7f24a4936998fe24da09827d8a12e9dd)#e2lr407t",
    "parent_descs": [
      "tr(9d759b09cec94b6f2bd322cedd5d136e7f24a4936998fe24da09827d8a12e9dd)#u9ras3xm"
    ],
    "safe": false
  }
]

Now i'll get the transactions confirmed and sweep the coins using sendall:

$ bitcoin-cli -regtest -rpcwallet=main generatetoaddress 1 $(bitcoin-cli -regtest -rpcwallet=main getnewaddress)
$ bitcoin-cli -named -regtest -rpcwallet=repro_stackexchange sendall recipients='["bcrt1qre2fezscuke8qaj9ham2klddj2rt7m4s78tvqq"]' fee_rate=1
{
  "txid": "a39b70bf4636bb78053d10a3bc03eb6866e6777e84aeb274bb4002a543b7bb99",
  "complete": true
}

Let's inspect the transaction. It does indeed spend the two coins from the wallet (one Taproot and one native segwit v0 as you can see from the witness):

$ bitcoin-cli -regtest getrawtransaction a39b70bf4636bb78053d10a3bc03eb6866e6777e84aeb274bb4002a543b7bb99 1
{
  "txid": "a39b70bf4636bb78053d10a3bc03eb6866e6777e84aeb274bb4002a543b7bb99",
  "hash": "be1fcf89ec92649ee0780a8ea86ade1512a7fff6cfc8f75430b1115f1321b8f1",
  "version": 2,
  "size": 298,
  "vsize": 167,
  "weight": 667,
  "locktime": 0,
  "vin": [
    {
      "txid": "e34a3b8116f328d2b1529134dfcc795fbe27eae3991eeb017bc582879cb73b81",
      "vout": 0,
      "scriptSig": {
        "asm": "",
        "hex": ""
      },
      "txinwitness": [
        "304402201e3ba83ca58a357e72d9df4d555f11a747e128ab2131868cb5620afc9b383d540220011c6fe77e37ed8ca83d50870fc5cc3995ecbd1cbd6305ede59bd4fd8aa05c2901",
        "03bd0d0b820dae844107803c9323fe73e81b9adf8abe329930ae9311dab6c3573e"
      ],
      "sequence": 4294967293
    },
    {
      "txid": "b2e975dee4ab0c68748e85fc847d7ef3fef44f53ee95e4765b1cc2b2c33939d2",
      "vout": 1,
      "scriptSig": {
        "asm": "",
        "hex": ""
      },
      "txinwitness": [
        "6cd85a806478d00f062e0bd7a43f46d7be082e4287819fcf07d3dda1d6a613a11e1197d15021f87aad16a697e326181d82156ff957fcb6593f5d030f33516471"
      ],
      "sequence": 4294967293
    }
  ],
  "vout": [
    {
      "value": 0.00084833,
      "n": 0,
      "scriptPubKey": {
        "asm": "0 1e549c8a18e5b2707645bf76ab7dad9286bf6eb0",
        "desc": "addr(bcrt1qre2fezscuke8qaj9ham2klddj2rt7m4s78tvqq)#5gumgp89",
        "hex": "00141e549c8a18e5b2707645bf76ab7dad9286bf6eb0",
        "address": "bcrt1qre2fezscuke8qaj9ham2klddj2rt7m4s78tvqq",
        "type": "witness_v0_keyhash"
      }
    }
  ],
  "hex": "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"
}