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What Can You Find in the IPSC?
617,912 narrations (IPSC v4.0.0), each with a parsed chain, identified narrators, and a transparent grade. Here's what the data contains and how to access it.
Search the corpus directly — by topic, collection, hadith number, or a narrator’s name. Open any narration to see its grade, attestation, and the parallel narrations that share its matn.
Evidence Map. Ask what the evidence is for a specific statement, and IPSC assembles every chain for it across all 128 works into one view: cross-collection corroboration (surfacing tawātur), per-position narrator confidence, verbatim critic verdicts kept distinct per source, the computed grade with every override applied, and a confidence envelope — a chain fails on its weakest link; a statement strengthens on its strongest corroborating chain. Statement-keyed, with per-chain drill-down.
Verify a Hadith
Search by text, collection, or number. See the parsed isnad, the grade, and the full provenance trail. Every grade traces to a specific narrator tier from a named scholarly source.
Try this in Theo →Trace a Narrator
68,299 narrators indexed, 28,586 with NRS reliability assessments. Look up any narrator to see their tier, the source of their assessment, their teacher-student connections, and every hadith they appear in.
Try this in Theo →Find Parallel Chains
8,170 canonical parallels (≥2-member matn clusters) and 52,938 near-duplicate (bag-of-words) clusters, plus semantic clusters at thresholds 0.85–0.92 (matn-core re-embedding rebuild), link the same teaching across all 128 collections. See how many independent chains carry a narration, its attestation level, and whether taqwiyah was applied.
Try this in Theo →Check a Grade's Provenance
Every grade is computed from: weakest narrator tier, chain continuity classification, defect cross-links, corroboration count, and documented grading rules. The autoGradeDetail field makes this fully auditable.
Try this in Theo →Search by Collection
Browse 128 classical works from the nine major collections to supplementary musnads, mu'jams, and fabrication-detection references. Filter by grade, narrator, or chain type.
Try this in Theo →Explore the Transmission Network
889,913 directed teacher-student edges mapping 1,400 years of hadith transmission. 7,973 narrator nodes with biographical data.
Try this in Theo →Access the corpus through Theo
Open Theo →Theo searches all four IPSC indexes — hadith, narrators, hidden defects, and matn clusters — and returns evidence with full citations.