I hope someone at Archive.org saves the Bitcoin, Etherium, DogeCoin and other blockchains. It would be nice to have all of the transactions saved saved somewhere, along with their source code, white papers, and other documents.
[Edit] Are there archives of the various forks of Bitcoin? What about all the "shitcoins"? Unless there's an active effort to save them, the blockchains aren't native to the web, and will get lost to history.