You guys are both right that it is a different security model, with the important distinction that it is opt-in. What I disagree with about what you said is only that we are encouraging more risky behavior by adding consensus rules via softfork. There are additional risks with drivechains, but not because of how the new consensus rules would be added (it would be the same risk as the P2SH softfork).

What's been explained to me a few times is that the anyone-can-spend-ness of new transaction types that depend on softforked consensus rules are exponentially less risky to the point that it is infeasible to steal them as blocks are added to the chain that activated the soft fork. I believe that Luke-Jr and Lopp are both very good at explaining this and I know that Lopp has actually done some research as to the cost of stealing these outputs. I can't remember the link but you might find that with a google. One of them might even chime in and explain that I'm totally wrong again!

Sorry for being a bit heated in my last response.


On 07/12/2017 02:55 PM, Tao Effect wrote:

That's a fair point, I confused anyone-can-spend with anyone-can-pay [1].

Isn't it different in the case of P2SH and SegWit, don't full nodes validate the script?

In other words, miners don't have complete control over the coins, full nodes keep a check on them.

At least that was my understanding, and if that's not the case then it doesn't make sense to me why Pieter would earlier in this thread object to Drivechain on the grounds that it's a different security model.

- Greg

[1] https://steemit.com/bitcoin/@jl777/bitcoin-spinoff-fork-how-to-make-a-clean-fork-without-any-replay-attack-and-no-blockchain-visible-changes

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On Jul 12, 2017, at 12:54 PM, CryptAxe via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:

Are we just pulling numbers out of thin air now? https://p2sh.info/ BIP16 for example is widely used. It would be difficult to find a single wallet that doesn't support BIP16 I have no idea what you are talking about.


On 07/12/2017 12:42 PM, Tao Effect via bitcoin-dev wrote:
...
In the present situation, anyone-can-spend outputs are used by probably less than 0.1% of users, and most software doesn't even allow for the possibility.

In Drivechain it's *encouraged-by-design*!

- Greg

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