Many high-energy physics data is already available publicly and anyone could scrutinise them. This will further happen for the LHC and other experiments.
This is however slightly different from what we pan to do here. Our goal is not to use data, but to rely on simulations to trigger new analyses of data. We need to proceed that way because even if data will become public, this may not happen very soon for various reasons. In addition, no one is as good as the experimental collaborations themselves to analyse and understand their data. This is so complex that we need true experts (which none of us are) and investigate years into that (which is a time none of us has here). However, for simulations the situation is different and there is something we can do (and we will thus do it)!
On the other hand, I am very unsure that putting data (real ones or simulated ones) on the blockchain is the way to go. I have discussed this with a few, and the conclusions are more or less "no". Here for instance, the main blocking point is that this would be unpractical. We have instead plans to make all generated data available to everyone, open access and all of this, but not on the chain.
The key point is that it is not so easy to put GBs of files on a chain and keep their content organised (those files are successions of numbers difficult to understand without guidance, which I will provide on chain). The blockchain will be used to testify how we work, what we do, etc. But it won't be used to collect our huge simulation output.