RPC Browser

addmultisigaddress nrequired ["key",...] ( "label" "address_type" )

Add an nrequired-to-sign multisignature address to the wallet. Requires a new wallet backup.
Each key is a Bitcoin address or hex-encoded public key.
This functionality is only intended for use with non-watchonly addresses.
See `importaddress` for watchonly p2sh address support.
If 'label' is specified, assign address to that label.

Arguments:
1. nrequired       (numeric, required) The number of required signatures out of the n keys or addresses.
2. keys            (json array, required) The bitcoin addresses or hex-encoded public keys
     [
       "key",      (string) bitcoin address or hex-encoded public key
       ...
     ]
3. label           (string, optional) A label to assign the addresses to.
4. address_type    (string, optional, default=set by -addresstype) The address type to use. Options are "legacy", "p2sh-segwit", and "bech32".

Result:
{                            (json object)
  "address" : "str",         (string) The value of the new multisig address
  "redeemScript" : "hex",    (string) The string value of the hex-encoded redemption script
  "descriptor" : "str"       (string) The descriptor for this multisig
}

Examples:

Add a multisig address from 2 addresses
> bitcoin-cli addmultisigaddress 2 "[\"bc1q09vm5lfy0j5reeulh4x5752q25uqqvz34hufdl\",\"bc1q02ad21edsxd23d32dfgqqsz4vv4nmtfzuklhy3\"]"

As a JSON-RPC call
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "addmultisigaddress", "params": [2, "[\"bc1q09vm5lfy0j5reeulh4x5752q25uqqvz34hufdl\",\"bc1q02ad21edsxd23d32dfgqqsz4vv4nmtfzuklhy3\"]"]}' -H 'content-type: text/plain;' http://127.0.0.1:8332/

{
    "name": "nrequired",
    "detailsLines": [],
    "properties": [
        "numeric",
        "required"
    ],
    "description": "The number of required signatures out of the n keys or addresses."
}

{
    "name": "keys",
    "detailsLines": [
        "     [",
        "       \"key\",      (string) bitcoin address or hex-encoded public key",
        "       ...",
        "     ]"
    ],
    "properties": [
        "json array",
        "required"
    ],
    "description": "The bitcoin addresses or hex-encoded public keys"
}

{
    "name": "label",
    "detailsLines": [],
    "properties": [
        "string",
        "optional"
    ],
    "description": "A label to assign the addresses to."
}

{
    "name": "address_type",
    "detailsLines": [],
    "properties": [
        "string",
        "optional",
        "default=set by -addresstype"
    ],
    "description": "The address type to use. Options are \"legacy\", \"p2sh-segwit\", and \"bech32\"."
}