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Second Brain · Knowledge Bridge

Where Private Insight Meets Collective Intelligence

Visualize the semantic bridge between your private knowledge nodes and the company Living Encyclopedia. Shared tags and auto-links reveal how your individual insights connect to collective enterprise knowledge.

§1 — What the bridge reveals

The bridge is a live overlay — not a copy. Your private data stays private; only the semantic edges are materialized.

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Shared tag intersections

Tags assigned to your personal nodes that also appear in the company encyclopedia are surfaced as bridge entry-points — revealing domain overlaps passively.

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Auto-link edges

The LLM auto-linker creates typed arcaq:AutoLink edges from your personal notes to company entities when confidence exceeds 0.7 — all visible in the bridge view.

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Privacy by design

Only the edge (link) is shared — never the private note content. Your teammates see that a link exists, not what your note says.

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Domain overlap score

The bridge computes a coverage score per knowledge domain: what percentage of your personal graph overlaps with company-validated concepts.

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Gap detection

Concepts heavily referenced in your private graph that have no company-level node are flagged as knowledge gaps — surfaced as contribution opportunities.

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Interactive bridge map

The bridge renders as a force-directed graph in the Second Brain sidebar — hover any edge to see the confidence score and the source note type.

§2 — RDF bridge link model

Bridge links are stored as named resources so they are queryable, filterable, and versionable.

# Named graph: http://arcaq.com/personal/{user_id} <link:abc123> a arcaq:BridgeLink ; arcaq:sourceNode <personal:note:xyz> ; arcaq:targetEntity <company:concept:RiskManagement> ; arcaq:linkType arcaq:SemanticOverlap ; arcaq:confidence "0.82"^^xsd:decimal ; arcaq:detectedBy "personal_autolink_orchestrator" ; arcaq:detectedAt "2026-05-15T03:12:44Z"^^xsd:dateTime ; arcaq:ownedBy <user:alice> .

§3 — API reference

Bridge queries are exposed under /second-brain/bridge.

MethodEndpointDescription
GET/second-brain/bridgeGet the bridge summary for the authenticated user — domain overlap scores and total link count
GET/second-brain/bridge/linksList all bridge links with source, target, confidence and type
GET/second-brain/bridge/gapsReturn personal concepts with no company-level equivalent — knowledge contribution opportunities
DELETE/second-brain/bridge/links/{id}Remove a specific bridge link (e.g. false positive from the auto-linker)

Connect your knowledge to your organization's

The bridge makes the invisible visible — showing precisely where your individual expertise reinforces or extends the collective knowledge graph.

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