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.
DEPRECATION WARNING: Using addresses with createmultisig is deprecated. Clients must
transition to using addmultisigaddress to create multisig addresses with addresses known
to the wallet before upgrading to v0.17. To use the deprecated functionality, start bitcoind with -deprecatedrpc=createmultisig

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 hex-encoded public keys
     [
       "key"                    (string) The 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 public keys
> bitcoin-cli createmultisig 2 "[\"03789ed0bb717d88f7d321a368d905e7430207ebbd82bd342cf11ae157a7ace5fd\",\"03dbc6764b8884a92e871274b87583e6d5c2a58819473e17e107ef3f6aa5a61626\"]"

As a json rpc call
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "createmultisig", "params": [2, "[\"03789ed0bb717d88f7d321a368d905e7430207ebbd82bd342cf11ae157a7ace5fd\",\"03dbc6764b8884a92e871274b87583e6d5c2a58819473e17e107ef3f6aa5a61626\"]"] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/