Spending Multisig Outputs with Bitcoin-CLI: A Step-by-Step Guide

As a multisignature (MS) wallet user, spending funds from your descriptor wallet is crucial to managing your assets effectively. In this article, we’ll walk you through the process of using Bitcoin-CLI to spend multisig outputs in a funding transaction.

Prerequisites

• You have a descriptor wallet with multiple addresses and multisignatures enabled.

• You have created a funding transaction tx1 that includes the desired spending amounts for each address.

Step 1: Create a funding transaction with descriptor outputs

To create a funding transaction, you can use the following Bitcoin-CLI command:

bitcoind -regtest -quiet -server=0.0.0.0:8332 -config=native -datadir=/path/to/directory -txindex=0 txout 

Replace with the path to your descriptor wallet file (e.g., descriptor.conf).

This will create a new funding transaction in Regtest mode. You can verify that the transaction has been created by checking the regtest console output:

regtest 

Step 2: Get the spending amounts for each address

To spend funds from your descriptor wallet, you need to get the spending amounts for each address. You can do this using the following command:

bitcoind -regtest -quiet -server=0.0.0.0:8332 -config=native -datadir=/path/to/directory -txindex=0 txout  | jq '. expendable_amounts[]'

This will output an array of spending amounts for each address in the funding transaction.

Step 3: Create a descriptor wallet file with multisig descriptors

To use multisig outputs, you need to create a descriptor wallet file that includes multisig descriptors. You can do this using the following command:

bitcoind -regtest -quiet -server=0.0.0.0:8332 -config=native -datadir=/path/to/directory -txindex=0 txout  | jq '. multisig_descriptors[]'

This will output an array of multisig descriptors for each address in the funding transaction.

Step 4: Spend funds from your descriptor wallet

Now that you have the spending amounts and multisig descriptors, you can use Bitcoin-CLI to spend funds from your descriptor wallet. You can do this using the following command:

bitcoind -regtest -quiet -server=0.0.0.0:8332 -config=native -datadir=/path/to/directory -txindex=0 txout  | bitcoin-cli -regtest -quiet -server=0.0.0.0:8332 -config=native -datadir=/path/to/directory -txindex=0 spend 

Replace with the hash of the funding transaction you created earlier.

Example Use Case

Suppose you have a descriptor wallet file descriptor.conf that includes the following multisig descriptors:

[

  {

    "address": "addr1".

    "multisign_index": 2,

    "spendable_amounts":[

      {"amount": 100},

      {"amount": 200}

    ]

  },

  {

    "address": "addr2".

    "multisignal_index": 3,

    "spendable_amounts":[

      {"amount": 50},

      {"amount": 75}

    ]

  } }

]

And a funding transaction tx1 that includes the desired spending amounts:

“`json

{

“txid”: “1234567890abcdef”

“vote”: [1, 2],

“outpoints”:

{

“prevote”: null,

“amount_n”: {“n”: 100},

“scriptSig”: [{“pubkey”: {“hash”: “12…”}}, {“pubkey”: {“hash”: “13…”}}, {“pubkey”: {“hash”: “14…”}}],

“amount_out”: {“n”:200}

},

{

“prevote”: null,

“amount_n”:{“n”:50},

“scriptSig”: [{“pubkey”: {“hash”: “12…”}}, {“pubkey”:{“hash”:”13…”}}, {“pubkey”:{“hash”: