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Signing Custom Tapscript Sheets with “walletprocesspsbt” Using Bitcoind

As a Taproot wallet user, you’re probably familiar with the complexities of handling multisig scripts in Bitcoin. In this article, we’ll explore how to sign custom Tapscript sheets using the “walletprocesspsbt” RPC endpoint within a Bitcoin node.

Understanding Multisig Scripts and Tapscripts

In Taproot wallets, multisig scripts are used to allow multiple parties to spend funds without revealing their private keys. Each multisig script is defined as a tapscript, which is a sequence of transactions that specifies how funds are spent. In your case, you have three different script paths for each multisig.

Bitcoin Core (the default wallet software) can compile and optimize tapscripts into scripts that can be used to sign custom tokens. A “leaf” in this context refers to a single transaction output that is part of a multisig script.

Walletprocesspsbt RPC endpoint

The “walletprocesspsbt” endpoint is a powerful tool provided by Bitcoind, the official Bitcoin node software. It allows you to process payment requests and generate multiple transaction outputs from your wallet’s private keys. You can use this endpoint to sign custom leaves using Tapscripts.

First, make sure you have Bitcoin Core installed and running on your system. Next, navigate to your wallet’s configuration directory:

cd ~/.bitcoincorewallet

Next, edit the settings.conf file (usually located at ~/.bitcoincorewallet/settings.conf) to add the following line:

rpc-process-pssbt = true

This tells Bitcoin Core to use the walletprocesspsbt endpoint.

Signing Custom Sheets with Tapscripts

After enabling the walletprocesspsbt endpoint, you can sign custom sheets with Tapscripts. Here is an example of compiling a tapscript for route 1 of the multisig script:

taproot-compile -scriptpath /path/to/script1.txb --outputpath /path/to/output1.p2sh

Replace “/path/to/script1.txb” with the actual file containing your multisig script and “/path/to/output1.p2sh” with the desired output file format (e.g. “p2sh”).

After compiling the tap script, you can use the “walletprocesspsbt” endpoint to sign it with your private key:

bitcoincorewallet --rpc-process-pssbt p2sh --path /path/to/output1.p2sh --privatekey 

This will generate a single transaction output containing all the outputs of the multisig script.

Example Use Case

Suppose you have three different multisig scripts defined as tap scripts, and each has a different script path. You can compile them with “taproot-compile” and then use the “walletprocesspsbt” endpoint to sign custom sheets for each script:

Compile multisig scripts 1-3
taproot-compile -scriptpath /path/to/script1.txb --outputpath /path/to/output1.p2sh
taproot-compile -scriptpath /path/to/script2.txb --outputpath /path/to/output2.p2sh
taproot-compile -scriptpath /path/to/script3.txb --outputpath /path/to/output3.p2sh

Sign custom sheets for each multisig script
bitcoincorewallet --rpc-process-pssbt p2sh --path /path/to/output1.p2sh --privatekey  \
--scriptpath /path/to/script1.txb \
--script 0x1234567890abcdef \
--output /path/to/output1

This will generate three custom transaction outputs containing all multisig script outputs for each script.

In short, you can use “walletprocesspsbt” to sign custom Tap scripts and generate multiple transaction outputs from your wallet’s private keys. This allows you to easily handle complex multisig scripts in Taproot wallets.