question: public static Script createMultiSigOutputScript ( int threshold , List < ECKey > pubkeys ) { checkArgument ( threshold > 0 ) ; checkArgument ( threshold <= pubkeys . size ( ) ) ; checkArgument ( pubkeys . size ( ) <= 16 ) ; ScriptBuilder builder = new ScriptBuilder ( ) ; builder . smallNum ( threshold ) ; for ( ECKey key : pubkeys ) { builder . data ( key . getPubKey ( ) ) ; } builder . smallNum ( pubkeys . size ( ) ) ; builder . op ( OP_CHECKMULTISIG ) ; return builder . build ( ) ; }
target:  Creates a program that requires at least N of the given keys to sign, using OP_CHECKMULTISIG. 