If you want it live-hosted for 500 years, you need people to host it. Some company. I don't know anyone that will even take your money and lie to you about tha

If you want it live-hosted for 500 years, you need people to host it. Some company. I don't know anyone that will even take your money and lie to you about that. Your best shot is a simple set of files on a few redundant medium. If you want to get fancy, put a browser on there that will run (presumably emulated) with no network dependencies. Hopefully with a 64 bit time_t.