Yeah, but I don't think you need proof of work for this. Something more akin to git with commit signing should work. The thing with cryptocurrencies is that there isn't anything of real value in the Blockchain. If you view git as Blockchain there is something of real value in it: the code. And here the encrypted data.
Although I don't know how you could make any kind of Blockchain containing data to be released at some condition and no way to release it before? If it's all public in the Blockchain it's all already public. You need atrusted authority that has a secret key to unlock the data. And if you have that all that Blockchain stuff is utterly redundant anyway.
Although I don't know how you could make any kind of Blockchain containing data to be released at some condition and no way to release it before? If it's all public in the Blockchain it's all already public. You need atrusted authority that has a secret key to unlock the data. And if you have that all that Blockchain stuff is utterly redundant anyway.