L7 · Private retrieval (onion routing)

The normative privacy-mode content-retrieval protocol: the per-request speed-vs-privacy toggle on the dig RPC surface, how a private read is onion-routed end-to-end (requester → guard/entry → middle → exit → providers → back) with a who-knows-what table, telescoping circuit construction over dig-nat mTLS (ntor X25519 + HKDF-SHA256 handshake, fixed-size 512-byte ChaCha20-Poly1305 layered cells, the RELAY command set), the onion-relay directory (dig-dht tag 0x04) and relay advertisement, guard nodes, the exit reusing the ordinary merkle-verified content read, and the honest threat model (partial-adversary unlinkability, stronger than Tor on exit integrity, weaker on anonymity-set size and Sybil cost).