Quote from: Vitalik Buterin on April 19, 2013, 11:03:54 AM

As for what is possible right now, I'm looking at https://en.bitcoin.it/wiki/Script, and it looks like there's a lot of opcodes that nobody seems to be taking advantage of yet. Might something like

(sig) (pubkey) OP_CHECKSIG (sig) (pubkey) OP_CHECKSIG (sig) (pubkey) OP_CHECKSIG OP_ADD OP_ADD 2 OP_GREATERTHANOREQUAL
(sig) (pubkey) OP_CHECKSIG (sig) (pubkey) OP_CHECKSIG (sig) (pubkey) OP_CHECKSIG OP_ADD OP_ADD 2 OP_GREATERTHANOREQUAL
(sig) (pubkey) OP_CHECKSIG (sig) (pubkey) OP_CHECKSIG (sig) (pubkey) OP_CHECKSIG OP_ADD OP_ADD 2 OP_GREATERTHANOREQUAL
OP_ADD OP_ADD 2 OP_GREATERTHANOREQUAL

for a "2-of-3 per group, 2 groups out of 3" transaction work?

Ah thank you Vitalik. That's exactly what I was looking for.

But most of this is not yet implemented? That is sad