Creates a multi-signature address with n signature of m keys required.
nrequirednumberREQUIREDkeysarrayREQUIREDaddress_typestringoptionalcurl --user myuser --data-binary '{"jsonrpc":"1.0","id":"1","method":"createmultisig","params":[2,["pubkey1","pubkey2","pubkey3"]]}' -H 'content-type:text/plain;' http://127.0.0.1:8332/{
"address": "3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy",
"redeemScript": "522103...52ae",
"descriptor": "sh(multi(2,...))"
}