You can believe that cool URIs don't change or you could go the IPFS route. Similar to the way torrents have a 'health' score of plenty of seeders, and IPFS resources could live as long as people want that resource to exist (Not sure if that situation is baked into IPFS though).
Cool URIs don't change: https://www.w3.org/Provider/Style/URI.html
You can believe that cool URIs don't change or you could go the IPFS route. Similar to the way torrents have a 'health' score of plenty of seeders, and IPFS resources could live as long as people want that resource to exist (Not sure if that situation is baked into IPFS though).
Also: have you looked into Filecoin?[0]
[0] https://filecoin.io/