For example, if you have an address abc123, you can run:

bitcoin-cli getaddressinfo --xpr abc123 > xpr_abc123.txt

This will output a file containing the XPR in PEM format. Save this file with a .txt extension and it’s ready to use.

Step 2: Importing an XPR into BTCPayServer

To import the XPR into BTCPayServer, you’ll need to generate a new private key using the createnewkey command. Here’s an example:

bitcoin-cli createnewkey --path  > 

Replace with the path where you saved the XPR file, and with the path where you want to save the generated private key.

For example, if you have a xpr_abc123.txt file in /path/to/xpr, you can run:

bitcoin-cli createnewkey --path /path/to/xpr > /path/to/private_key

This will generate a new private key and store it securely on your system.

Verifying the XPR with BTCPayServer

Once you have the imported private key, you can verify the authenticity of payments using the verify command. Here’s an example:

btcpayserver verify --key  --xpr 

Replace with the path where you saved the generated private key, and with the path where you saved the XPR file.

For example:

btcpayserver verify --key /path/to/private_key --xpr /path/to/xpr

This will output a verification result indicating whether the payment is valid or not. If the payment is valid, BTCPayServer should display the public key for you to use in your application.

Tips and Variations

• Make sure to store the XPR securely on your system using techniques such as encryption and secure password management.

• You can also use other methods to verify payments, such as using the verify command with the -pkey option instead of importing a new private key.

• In case you need more advanced verification checks or custom signing algorithms, you might want to consider using additional libraries or tools for your specific use case.

I hope this article helps you successfully export an XPR from Bitcoin Core and use it with BTCPayServer!