Mr. OutCast3k,

I have a question, but it is more of a general question that is just indirectly related to coinb.in.

Can I add a multisignature address to bitcoin core? Can I then add the private keys (assuming I have them of course) and do a spend using that wallet?

For example, I create a 2-of-3 address. Let's make a more concrete example and I'll use your page to do it:

I first generate 3 regular addresses, public keys, and private keys:

1P6xdHExqRusJ8hM4vpTjuDnum4Crxoxb8
03d6a0edc630c29f649500d592091039d7f3c942ec07bb7ebdabfe5727c58964fd
KwyKy7C7f8pHw1GizvWhLpE6GB13ZcfNJoX98MHiwwz1x77MksQq

1Eom4fsSnmka311BbJrmUjyY29tsQcrTyD
0305143caa81bc0fec9237f594939d0ceb667cb78e451264e8d2a677648a871aeb
Kyw4KDi8Lre2WhpTJt8p8gfTEkpSfqVv8dv3bJ75cmuyvFHQ7HBy

1Ceidy7FSL8Vzrqg5SfzUpEqDwmPB9Drfo
0306c73d2aea0a492e268dd1b3ed1ba1bbdc54c1d4a3a46d9d74fe81f3e6a301af
KxbsQxm5Q8pGXPs8AWP7Lt1SkzFrvgZr2EdKpB9WTFCkC4cdnK3V

Then I input the above public keys in that order (and order seems to affect the result) and come up with the following:

Address
3NUEUQspbf9LK3mRN13pLNyzeEK4Ep1HRC

Redeem Script
522103d6a0edc630c29f649500d592091039d7f3c942ec07bb7ebdabfe5727c58964fd210305143 caa81bc0fec9237f594939d0ceb667cb78e451264e8d2a677648a871aeb210306c73d2aea0a492e 268dd1b3ed1ba1bbdc54c1d4a3a46d9d74fe81f3e6a301af53ae

Does bitcoin core (currently version 0.12.1) not work if I import the 3 private keys? Or it won't know what to do? That then leaves me with the option of using your site.

Actually, I'm looking for a way to do this with thousands of addresses (all of them multi-sig). The big wallet guys and exchanges have already done this, but I don't know if their code is open (I haven't checked.) Ideally, there would be 2 or 3 different physical machines with 2 cold offline airgapped, but for testing purposes it will be just one.