This command modifies all segwit inputs and outputs within a PSBT by incorporating relevant data retrieved from output descriptors, the UTXO set, or the mempool.

How is this used?

The utxoupdatepsbt command is utilized to enhance the completeness and accuracy of a PSBT by updating its segwit inputs and outputs with information obtained from output descriptors, the UTXO set, or the mempool. This is crucial for preparing PSBTs for finalization and broadcast on the Bitcoin network, ensuring that they contain the latest transaction data and adhere to network requirements.