Just use the philosopher's stone, stay alive and host it yourself in 500 years old. Look up Nicolas Flamel, his house is now the oldest in Paris, https://en.wi

Just use the philosopher's stone, stay alive and host it yourself in 500 years old. Look up Nicolas Flamel, his house is now the oldest in Paris, https://en.wikipedia.org/wiki/House_of_Nicolas_Flamel https://en.wikipedia.org/wiki/House_of_Nicolas_Flamel Create an artifact, surround it with mystery, and in 500 years it will be either an artifact exposed in the museum, or a relic people will be looking for even in generations. Some people like to pretend that the philosopher's stone isn't real, but if you visit the catacombs with a radio-isotope detector and locate his remains, you will be convinced it is. Presumably it was a hot to the touch radioactive meteorite passed down through generations that had been wrapped in lead. When he melted the lead, the transmuted gold fell at the bottom. It was a technology that wouldn't be discovered until Becquerel 500 years later. Inside this meteorite, which until it was shielded properly, whose path you could back-trace via following the traces of radioactivity, it was discovered by x-ray imagery that it contained a perfect metallic disk with engraved features in its core. The rest is classified, but if you can store your website in a box there, you can rest assured that it will be preserved too.