The walletprocesspsbt RPC takes as input a PSBT, adds UTXO, key, and script data to inputs and outputs that miss it, and optionally signs inputs. Where possible it also finalizes the partial signatures.
walletprocesspsbt "psbt" ( sign "sighashtype" bip32derivs )
*bitcoin-cli help walletprocesspsbt
walletprocesspsbt "psbt" ( sign "sighashtype" bip32derivs ) Update a PSBT with input information from our wallet and then sign inputs that we can sign for. Arguments: 1. "psbt" (string, required) The transaction base64 string 2. sign (boolean, optional, default=true) Also sign the transaction when updating 3. "sighashtype" (string, optional, default=ALL) The signature hash type to sign with if not specified by the PSBT. Must be one of "ALL" "NONE" "SINGLE" "ALL|ANYONECANPAY" "NONE|ANYONECANPAY" "SINGLE|ANYONECANPAY" 4. bip32derivs (boolean, optional, default=false) If true, includes the BIP 32 derivation paths for public keys if we know them Result: { "psbt" : "value", (string) The base64-encoded partially signed transaction "complete" : true|false, (boolean) If the transaction has a complete set of signatures ] } Examples: > bitcoin-cli walletprocesspsbt "psbt"