Quote from: CIYAM on January 12, 2016, 01:33:46 PM

What I am wanting to create is a Bitcoin script that will do the following:

- check against
- check against

then only redeem if both sig checks work but *additionally* I need it to ensure that is identical to and that is different to .

Is this even possible?

If must be identical to , then essentially aren't you saying that you require two the following:

- check against
- check against

Though it seems roundabout, OP_CHECKMULTISIG could potentially be used. If you put in a null output and require 2-of-2 signatures that sign the output, then in effect that would mean and have to be valid signatures of .

Here's my cursory attempt. The problem with it (in addition to whatever problems I don't see) is that the scriptPubKey doesn't pass the "is_p2sh()" test since it's not "OP_HASH160 <20 bytes> OP_EQUAL". Since I'm not sure how far you're willing to go from Bitcoin in your endeavor, I figure I'll include this anyway.

redeemScript:

Code:

2 2 OP_CHECKMULTISIG

scriptSig:

Code:

0

scriptPubKey:

Code:

// This part copies and to the alt stack for later.
2 OP_PICK OP_TOALTSTACK 1 OP_PICK OP_TOALTSTACK

// Normal P2SH stuff.
OP_HASH160 OP_EQUAL

// Bring and back from the alt stack. The top stack item will be true if they are not equal.
OP_FROMALTSTACK OP_FROMALTSTACK OP_EQUAL OP_NOT

At any rate, hopefully this will give you some ideas.