How can I confirm {that a} PSBT is solvable by a selected descriptor?

To do that you’ll have to first be sure the PSBT has the required info required by the descriptor to doubtlessly signal the transaction. Do that through the use of Bitcoin Core’s command-line instruments (bitcoin-cli)

[Note: The descriptor in Bitcoin specifies how the keys in a wallet are structured and provides the script needed to control the coins. Examples of descriptors include pkh, wpkh, and sh(wpkh). Each descriptor requires certain data to sign a transaction, such as public keys and redeem scripts].

• First you’ll want to decode the PSBT to find what info the PSBT at present has, akin to inputs, outputs, signatures or scripts.

  • Use the code:
    
bitcoin-cli decodepsbt “your_psbt_here”



• Use the getdescriptorinfo command to get extra details about your descriptor, notably to know what scriptPubKey and the redeem scripts it generates:

  • use the code code:

    bitcoin-cli getdescriptorinfo “your_descriptor_here”


• Subsequent you’ll must test the PSBT Inputs Towards the Descriptor Outputs: For every enter within the PSBT, test that the scriptPubKey and redeemScript match these anticipated by the descriptor. You’d evaluate the hash of those scripts or the addresses derived from them, to verify they align with what the descriptor can produce and signal for.

• You could fill within the lacking information in PSBT, If the PSBT is lacking any essential info that the descriptor can present (like redeemScripts or witnessScripts), you need to use the utxoupdatepsbt command. This command tries so as to add lacking info to the PSBT utilizing the UTXO set recognized to the node:

  • use the code:
    
bitcoin-cli utxoupdatepsbt “your_psbt_here


• Validate Solvability: After making certain all essential info is current within the PSBT and matches with the descriptor capabilities, you possibly can contemplate the PSBT as solvable by the descriptor. Every enter ought to have corresponding essential information to permit for signing.

• Now you can attempt to signal the PSBT utilizing walletprocesspsbt (in case your pockets helps the descriptor) with a purpose to confirm if it may well really produce legitimate signatures:

  • use the code:

    bitcoin-cli walletprocesspsbt “your_psbt_here”



If the above command efficiently indicators the PSBT, it confirms the PSBT is solvable by the descriptor.