i have a question for the computer scientists in the crowd.
i've noticed some things about the WP's over the last coupla years, including Satoshi's, that i wasn't aware of. first, there doesn't seem to be any peer review. not only that but what strikes me is that it seems that authors come up with a particular logic pattern that makes sense to them and then construct maths to support that logic. i often don't even see large data sets, testing, or simulations performed. that supposedly is a standard for proof of a theory. is this correct? this is not a criticism of the CS field but just an inquiry to help me understand your field.
in many fields, a hypothesis is asked, then an experiment with blinded investigators along with large #'s of subjects and controls is carried out over a statistically significant time period to rule out investigator bias (can never do that completely) and prove that the hypothesis is correct within a std dev often of p<0.05 or 5%. i realize these are different methods in different fields so it's hard to determine which is more rigorous.
Satoshi's whitpaper is not a "scientific" paper but a good "technology advance" paper. It specifies a concrete real-world problem (build an e-cash system that does not depend on trusted 3rd parties) and an open sub-problem of that (how to motivate the volunteers to maintain and secure the ledger). It then describes a proposed solution for that sub-problem, with enough detail that any competent programmer could implement it. The paper concludes with some logical arguments and computations showing that the proposed solution does not have some flaws that one may think of. Then Satoshi built an implementation that would be sufficient to prove the soundness of the solution. He set that implementation running, and recruited enough interested people to make the test meaningful.
The Sidechains whitepaper is nothing like that. It does not define concrete real-world problem(s) to be solved, and then develop suitable solution(s) for it/them. Instead, the "problem" that it sets to solve is how to save bitcoin from being superseded by centralized payment systems and other altcoins. The "solution" they propose is basically to rebrand the best altcoins plus some unspecified array of other network services as "sidechains of bitcoin", in exchange for some unspecified advantages involving merged mining and the prestige of bitcoin. However, there are no details in the paper to even tell what applications could be "sidechains", how the integration would work, what concrete benefits they would derive from that, why other projects could not obtain the same benefits without being "sidechains of bitcoin" -- and why would bitcoin be saved as a result. Needless to say, there is also no analysis of possible failure modes.
Just as bitcoin reminds me of the Wright Brothers' Flyer One, the sidechains proposal reminds me of their unsuccessful efforts to commercialize their invention. (AFAIK, the first commercially successful series-produced airplane, still only a toy for aeronautics nerds, was
this one.)
"Dear investors, you are all aware of the hard times that Ford Motor Co. has been going through, because of competition from manufacturers of cars that are cheaper, faster, more beautiful, or more reliable than ours. You know that, while we could incorporate their advantages in our Model T, modifying our assembly lines is very expensive and would take too long. But we have come up with an idea that will surely save us. We will allow the other manufacturers to rebrand themselves: "Ford Jeep" instead of "Jeep", "Ford Jaguar" instead of "Jaguar", "Ford Mercedes" instead of "Mercedes", etc.. We will allow them to use our great assembly lines, as long as they don't require any special change or interfere with our production. We will also build a yard where our customers will be able to safely trade their Model Ts for cars of our competitors, at values established by the latter. Thus we expect to turn our most formidable competitors into our allies, and, with their help, retain our dominant share of the billion-dollar revenue to be made in the car market."