Disclaimer: non-expert. I think that's mixing two things: the code that the miners run, and the code that is the digital contract. I think the idea behind digi

Disclaimer: non-expert. I think that's mixing two things: the code that the miners run, and the code that is the digital contract. I think the idea behind digital contracts is that, once the parties commit to it, it should be set in stone (set in code), un-changeable, even by a majority of miners, irrespective of the fact that the algorithm used for distributed mining is majority based. In other words if a small set of parties do a digital contract (eg. the DAO people), then the whole point of the blockchain is that, once it's in the blockchain, it can't be undone---even if some people don't like it, change their minds, whatever. It assumes the miners just supply the mining power, but don't go in and conspire to remove specific blocks. This situation shows that in the case of Ethereum, a small set of people are able to influence a lot of mining nodes, and hence get a majority, and have no problem going in an changing specific things in the blockchain (by changing the source code of the mining software).