The Z-ART Protocol establishes a high-fidelity framework for the scientific verification, digital anchoring, and long-term integrity of high-value artworks. By synthesizing multispectral acquisition, SHA-256 cryptographic hashing, and CERN-backed DOI anchoring, this protocol bridges the ontological gap between physical objects and their digital representations. PRIOR ART DECLARATION & CONTINUOUS SINGLE AUTHORSHIP This Protocol Z-ART v4.0 is the fourth major iteration of continuous research, originally initiated and maintained exclusively by Tomislav Svilković (ORCID: 0009-0002-5624-9027). The following published versions establish unambiguous prior art, continuous single authorship, and intellectual priority: - Protocol Z-ART v1.0: Published on Zenodo, January 29, 2026, DOI: 10.5281/zenodo.18410673- Protocol Z-ART v2.0: Published on Zenodo, January 29, 2026, DOI: 10.5281/zenodo.18411011- Protocol Z-ART v3.0: Published on Zenodo, January 29, 2026, DOI: 10.5281/zenodo.18411198- Protocol Z-ART v4.0: Published on Zenodo, January 29, 2026, DOI: 10.5281/zenodo.18412513 SINGLE AUTHOR & INTELLECTUAL PROPERTY DECLARATION Tomislav Svilković is the sole author and intellectual property holder of the Z-ART Protocol in all iterations. No other person may claim authorship, co-authorship, or derivative rights without explicit written consent from the author. This protocol is an indivisible technical entity published under CC BY-NC-ND 4.0. Non-commercial use is free with attribution; commercial use requires written licensing agreement. JURISDICTION: WIPO Arbitration, Geneva, Switzerland.