Sign inputs for raw transaction (serialized, hex-encoded) using given private keys.
hexstringstringREQUIREDprivkeysarrayREQUIREDprevtxsarrayoptionalsighashtypestringoptionalcurl --user myuser --data-binary '{"jsonrpc":"1.0","id":"1","method":"signrawtransactionwithkey","params":["hex",["privkey"]]}' -H 'content-type:text/plain;' http://127.0.0.1:8332/{
"hex": "0200000001...",
"complete": true
}