Ordinal 16 documents the Proof-of-Unchanged Global Application Matrix, a custody-boundary verification methodology for determining whether exported digital evidence has remained byte-unchanged across time, custody transitions, and lawful transformations. The record formalizes a domain-agnostic approach to post-export, pre-archive verification, applicable across clinical trials, audit and assurance, AI governance, cloud integrity, and long-term regulated evidence retention. Verification is performed using deterministic, hash-only comparison of canonical evidence states (Tₖ vs Tₙ), with optional decentralized time attestation and public blockchain anchoring. No raw evidence, identifiers, or personal data are disclosed. The methodology produces one of two deterministic outcomes: (i) Proof-of-Unchanged (PASS), confirming byte-level equivalence between evidence states; or (ii) divergence enumeration, identifying byte-level or membership-level differences to bound proportional human review. Divergence outcomes are informational and do not imply error, non-compliance, or misconduct. Proof-of-Unchanged is applied at custody boundaries, not within source systems, and does not require integration with operational platforms. It detects change rather than preventing it, and preserves evidentiary continuity across legitimate transformations by establishing new canonical states following verified SOP-driven modifications. This record is published as a public methodology document, supported by cryptographically anchored execution evidence and regulatory mapping described in C12 – AuditLog.AI Global Compliance Matrix. It does not assert regulatory approval or classification, and is intended to support independent evaluation, inspection readiness, and reproducibility assessment. File: C17 Proof-of-Unchanged Global Application Matrix_FINAL_METADATA___20260206T030032Z.pdf RIPEMD-160: cf3ce23ffe77c0d7c396809de9153779feb0b0e1 SHA-256:71119853b38273f2ea90f6e0b45df662623076c5ebc07cba591640003cf2f55a ORDINAL TXID: ec55164dd0169ff5e7b74b71ccc2de3cdbdd7ea6885d459981a9d5069e8e97de BLOCK: 935197 OP_RETURN TXID: e1317e515da208ceca224b32866a0fa317da2e6138f3e5829ee90565330408aa BLOCK: 935198