Importing a 2-of-3 multisig descriptor (prv, pub, pub) into Bitcoin Core can be tricky, and sometimes the process fails with the error “ListDescriptors true fails”. This error message indicates that the descriptor syntax is incorrect or there is a problem with the descriptor itself. In this article, we will go over some of the common causes of this error and how to fix them.
What are Output Script Descriptors?
Output script descriptors are a new feature introduced in Bitcoin Core 0.17 that simplifies the creation of complex transaction output. They allow users to define a set of conditions that must be met in order for a UTXO to be issued. These conditions can include things like multi-signature requirements, time locks, and spending limits. Issue script descriptors are written in a human-readable language that is translated into a script that can be executed by Bitcoin Core.
What is a 2-of-3 multisig descriptor?
A 2-of-3 multisig descriptor is a type of output script descriptor that requires two of three possible signatures to spend a UTXO. This can be useful for creating shared accounts where multiple parties must agree before funds can be spent. The descriptor consists of three public keys, one for each party, and requires two of these keys to be used to create a valid signature. The descriptor may also contain a private key for one of the parties, allowing them to sign transactions without the other parties being present.
Common causes of ListDescriptor True failures
There are several reasons why ListDescriptors True Fails can occur when importing a 2-of-3 multisig descriptor. Here are some of the most common ones:
Wrong syntax
One of the most common causes of ListDescriptors True Fails is incorrect syntax in the descriptor. Output script descriptors are written in a human-readable language, but they must follow a strict syntax in order to be interpreted correctly by Bitcoin Core. Even small errors in the syntax can cause the descriptor to fail. It is important to carefully review the descriptor and make sure it follows the correct syntax before attempting to import it.
Invalid public key
Another common cause of ListDescriptors True Fails is invalid public keys in the descriptor. Bitcoin Core requires public keys to be in a certain format in order to be used in a transaction. If the public keys in the descriptor are not in the correct format, the descriptor will fail. It is important to ensure that all public keys in the descriptor are valid before attempting to import it.
Troubleshooting ListDescriptors True Failed
If you encounter a ListDescriptors True Fails error when importing a 2-of-3 multisig descriptor, there are several steps you can take to troubleshoot the problem. Here are some tips:
Check the syntax
The first step in troubleshooting ListDescriptors True Fails is to check the syntax of the descriptor. Look for typos or incorrect syntax in the descriptor and correct them. It is also a good idea to use a syntax checking tool, such as the one included in Bitcoin Core, to ensure that the descriptor follows the correct syntax.
Verify the public keys
If the syntax of the descriptor is correct, the next step is to verify the public keys. Make sure that all public keys are in the correct format and that they are valid. You can use Bitcoin Core to verify the validity of public keys by running the following command in the console:
validateaddress public key
If any of the public keys are invalid, you must correct them before attempting to import the descriptor.
Check descriptor format
If the syntax and public keys are correct, the next step is to check the format of the descriptor. Make sure that the descriptor is in the correct format for a 2-of-3 multisig descriptor. You can compare the descriptor to examples of valid 2of-3 multisig descriptors to make sure it is correct.
Try another descriptor
If all else fails, it may be worth trying a different descriptor. There may be a problem with the specific descriptor you are trying to import and using a different one may solve the problem. You can also try creating a new descriptor from scratch and importing it to see if that solves the problem.
Conclusion
Importing a 2-of-3 multisig descriptor (prv, pub, pub) into Bitcoin Core can be a complex process, but with the proper troubleshooting steps, it is possible to resolve the ListDescriptors True Fails error. By checking the syntax, verifying the public keys, and checking the descriptor format, you can identify and fix the problem that is causing the error. If all else fails, trying a different descriptor might be the answer. Using these tips, you can successfully import 2 out of 3 multi-sig descriptors and create complex transaction output in Bitcoin Core.
FAQs
What is a 2-of-3 multisig descriptor?
A 2-of-3 multisig descriptor is a type of output script descriptor that requires two out of three possible signatures in order to spend a UTXO.
What is the cause of ListDescriptors True Fails when importing a 2-of-3 multisig descriptor?
ListDescriptors True Fails can occur due to incorrect syntax in the descriptor, invalid public keys, or issues with the descriptor format.
What should I do if I encounter a ListDescriptors True Fails error?
If you encounter a ListDescriptors True Fails error, you should check the syntax of the descriptor, verify the public keys, and check the descriptor format. If all else fails, trying a different descriptor may be the solution.
How do I check the syntax of an output script descriptor?
You can check the syntax of an output script descriptor by reviewing it for typos or errors and using a syntax checker tool, such as the one included in Bitcoin Core.
How do I verify the validity of public keys in an output script descriptor?
You can verify the validity of public keys in an output script descriptor by using Bitcoin Core to run the following command in the console: validateaddress public key
CanI import a 2-of-3 multisig descriptor with a private key for one of the parties?
Yes, a 2-of-3 multisig descriptor can include a private key for one of the parties, allowing them to sign transactions without the need for the other parties to be present.
What are some other types of output script descriptors?
Other types of output script descriptors include time-locked contracts, spending limits, and nested multi-signature requirements.