A working Rust port of Udanax-Gold with a modern stack on top: BLAKE3 content-addressed chunk store, O-tree CRDT collaborative editing, Ed25519 per-passage attribution, and live transclusion with provenance — all exposed over a 140+ operation WebSocket API with a React frontend. The Xanadu lineage is real, not marketing gloss: tumblers, enfilades, canopy trees, backfollow, and DagWood are all documented with code examples and diagrams, and there's a side-by-side concept map from the 1999 C++ codebase to the Rust descendants. The claims are unusually testable. There's a federation demo verified end-to-end across two servers, a federation security audit cataloguing 14 authorization gaps by severity (they publish their own CRITICALs, which I respect), and a page answering the four standard "this killed Xanadu" objections against a running system. Docs are deep — the Space Algebra section alone runs 20 sections. The concern is scope. Nelson's 1960 design was famously never finished for a reason, and this thing has phases up to 19b (PBFT governance) plus micropayments, which historically was the load-bearing failure. But they're showing receipts, and the heritage-mapping discipline is more rigor than most hypertext projects ever managed.