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We propose that the Andean khipu is a structured data archive carrying numbers and text simultaneously on the same physical medium. Computational analysis of the Open Khipu Repository (619 khipus, 54,403 cords, 110,677 knots) identifies a syllabic content channel encoded in long-knot turn counts, complementing the established decimal number system (Locke 1923). A 13-symbol syllabary with 3 position-dependent alternations (16 effective symbols), derived by brute-force optimization and independently replicated (p = 0.004), achieves approximately 97% lexical coverage on testable text-bearing cords. The syllabary produces archaeologically grounded results: A toponymic system confirmed by colonial-era Andean place names Personal names and kinship terms consistent with documented Andean social structure At least eight distinct document types: tribute registers, cadastral surveys, censuses, judicial dossiers, oracle records, identity registers, administrative texts, and an astronomical catalog — all structured forms, none prose Three structural discoveries further support the framework: empty cords function as section separators, subsidiary cord color encodes thematic chronology (37% of corpus, 7× chance expectation), and in-situ Quechua-Aymara bilingualism is confirmed. The khipu is neither a counting device nor a writing system in the literary sense. It is the Inca equivalent of a spreadsheet, and we can now read it as one. All data, code, and translations are publicly available. We invite replication, critique, and collaboration from Andean specialists. ALBA Project — alba-project.org