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Is it possible to create a type of redemption script that when the correct number of signatures are collected pays out to a pre-defined address ?
P2SH that pays out only to a certain Bitcoin address?
Answers
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I believe this is possible, but with a subtle difference to how OP suggests.
OP seems to want: funds are first signed off by the multisig address, then a transaction is broadcast moving the funds to [destination].
It's not possible for a destination script to stipulate where the funds can end up. A new opcode could introduce that feature, but we can do this a different way.
I would argue this no weaker than having a transaction between the two destinations (as OP envisioned). In either case the multisig participants could hold the funds to ransom before the end user can move them.
Multisig: 2 [pubkey1] [pubkey2] 3 CHECKMULTISIG
Destination: DUP HASH160 [hash] EQUALVERIFY CHECKSIG
Since we cannot lock funds so they are released to a certain destination, we just merge the two scripts, allowing predefined party to take control only when the multisig is solved. He would propose a spend to the others, they sign, then he signs (it can be done in any order)
The scriptPubKey (or P2SH script) would then look like this:
2 [pubkey1] [pubkey2] 3 CHECKSIG DUP HASH160 [hash] EQUALVERIFY CHECKSIG
And the scriptSig:
[sig1] [sig2] [sigA] [pubkeyA]
Re ransom/theft: In the predetermined address case, they would refuse to sign release unless they are paid 1BTC. In my case, they would only sign a transaction if x% goes to their address. – karimkorun – 2016-05-12T16:54:28.390
And who would be able to sign? If anyone can sign, this is trivial to game. Otherwise it is multisig?
– Murch – 2015-07-28T12:20:05.910Yes it would be multi sig. Basically a multi sig address that only pays out to a pre-determined bitcoin address.
This would be useful as a secure bitcoin vault. Even if the key holders collude. The destination can't be changed. You could then create a hierarchy of wallets with different approval levels. – Ian Purton – 2015-07-29T09:53:31.907
Ah, sorry, I had overread the "pre-defined address" part. Carry on. :) – Murch – 2015-07-29T21:46:05.070