A web based interface to the Bitcoin API JSON-RPC

Command: createmultisig

The createmultisig RPC creates a P2SH multi-signature address.

Parameter #1—the number of signatures required
Parameter #2—the full public keys, or addresses for known public keys
Result—P2SH address and hex-encoded redeem script

The minimum (m) number of signatures required to spend this m-of-n multisig script.
Click "+" to add more keys, "-" to remove added keys. A public key against which signatures will be checked. Alternatively, this may be a P2PKH address belonging to the wallet—the corresponding public key will be substituted. There must be at least as many keys as specified by the Required parameter, and there may be more keys.
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createmultisig nrequired ["key",...]

Creates a multi-signature address with n signature of m keys required.
It returns a json object with the address and redeemScript.

Arguments:
1. nrequired      (numeric, required) The number of required signatures out of the n keys or addresses.
2. "keys"       (string, required) A json array of keys which are bitcoin addresses or hex-encoded public keys
     [
       "key"    (string) bitcoin address or hex-encoded public key
       ,...
     ]

Result:
{
  "address":"multisigaddress",  (string) The value of the new multisig address.
  "redeemScript":"script"       (string) The string value of the hex-encoded redemption script.
}

Examples:

Create a multisig address from 2 addresses
> bitcoin-cli createmultisig 2 "[\"16sSauSf5pF2UkUwvKGq4qjNRzBZYqgEL5\",\"171sgjn4YtPu27adkKGrdDwzRTxnRkBfKV\"]"

As a json rpc call
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "createmultisig", "params": [2, "[\"16sSauSf5pF2UkUwvKGq4qjNRzBZYqgEL5\",\"171sgjn4YtPu27adkKGrdDwzRTxnRkBfKV\"]"] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/