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Torrin’s shared cache is a cache — content gets evicted when it’s cold or over capacity. Cairn is the escape hatch: it posts a cached item to Usenet, so even after the hot copy is evicted, the item can be re-hydrated on demand instead of re-downloaded from the source.

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Why

  • Permanence without the storage bill. Keeping everything hot is expensive; Usenet retention is cheap and long. Cairn trades an instant hot copy for a durable cold one.
  • Survives eviction. An archived title comes back even if it’s since dropped out of the live cache and the original torrent is dead.

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How it works

The NZB (the index needed to pull it back) is kept durably and backed up, so a restore is a Usenet re-download, not a re-leech of the original.

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The endpoints

Archiving is queued and happens in the background — posting to Usenet takes minutes per title. The item stays streamable from cache in the meantime.