Despite all those who criticize it; Crypto. Its literally made for this purpose. You put it on the blockchain and it cannot be taken away without compromising the integrity of the chain. And even if it is done, it has to be done by forking, which would mean that the original fork would still have your content. It can be accessed anytime by using the correct client and having a copy of the chain.
> It can be accessed anytime by using the correct client and having a copy of the chain.
Anything can be accessed anytime if you have your own copy of it.
"Hey, every fighter for our cause, or everyone who in the future might become interested in thse issues, here's how to read my revolutionary manifesto: Just download your own personal copy of the entire blockchain, it's in there!"
Yeah, well, then you can just tell them all to download your manifesto beforehand.