Ask HN: Preserving knowledge long-term without a central authority

I am exploring an idea for a decentralised system intended to preserve knowledge over very long time horizons, without reliance on a central authority.

The motivation comes from concerns around institutional fragility and the historical loss of libraries and archives.

Before investing further effort, I am interested in whether such a system is conceptually sound, and what obvious failure modes I might be missing.

Any critical feedback would be appreciated.