Abstract This record is led by The Triad System: Structural Triangulation for Verifiable AI Conformance and includes its companion normative specification, TUS LANDING_TRIAD_SET Specification v1.0, together with a SHA-256 checksum file for artifact verification. The Triad paper defines the TUS OS® Triad as a structural triangulation layer for verifiable AI conformance. Within TUS, a single receipt remains authoritative but local to one realized decision path. The Triad extends that foundation by constructing a deterministic three-start set from a shared anchor state and running paired GUIDANCE and LANDING receipts from each start. The result is a six-receipt set that widens the available structural evidence surface without changing the underlying kernel, core receipt machinery, or shared receipt semantics. In downstream reporting, LANDING provides the primary report-facing surface, while GUIDANCE remains available as a supporting structural comparison. The companion specification defines the exact normative rules for the active emitted Triad variant, LANDING_TRIAD_SET_V1. It specifies the conformant three-start, three-pair construction, pair ordering, anchor mapping, deterministic LANDING behavior, emitted fields, and required set-level artifacts. The specification is authoritative for Triad set behavior and is intended to be read together with the TUS core protocol. Included files The Triad System: Structural Triangulation for Verifiable AI Conformance.pdfPrimary architectural paper introducing the TUS Triad as a deterministic structural triangulation layer for verifiable AI conformance.SHA-256: 615314f7519a07114019f0eceeff6aaf5fcf6f9f610074de56a8310e38bc7975 TUS LANDING_TRIAD_SET Specification v1.0.pdfNormative companion specification defining the exact rules for the active emitted Triad variant, LANDING_TRIAD_SET_V1.SHA-256: 7c83c77d1cc605b5fb8d0c5145ef8b97dc2145b4898281970e21a80dc6309e5f TUS_The Triad System_sha256 Checksums.txtSHA-256 checksum file for the included PDF artifacts, provided to support artifact-integrity verification.

NOTE — Clarification: In this paper, “six-receipt set” refers only to the receipt-bearing members of the Triad set: three canonical GUIDANCE receipts and three canonical LANDING receipts. In the active emitted `LANDING_TRIAD_SET_V1` profile, the practical emitted bundle is larger: 16 files in total, comprising 6 canonical receipt files, 6 paired audit files, and 4 set-level artifacts (`triad.canonical`, `triad.foundation`, `triad.synthesis`, and `manifest`). This clarification does not change the paper’s substantive claim; it clarifies the distinction between the receipt-bearing set and the full emitted bundle.