Operationalizing the EU AI Act through eIDAS Trust Services Primitives: A Reference Mapping for High-Risk AI Systems

v1.0 preprint (17 May 2026) of Operationalizing the EU AI Act through eIDAS Trust Services Primitives: A Reference Mapping for High-Risk AI Systems. This working paper maps selected high-risk obligations in Regulation (EU) 2024/1689 (the EU AI Act) to cryptographic and trust-service primitives drawn from eIDAS/eIDAS 2.0, ETSI EN 319-series standards, IETF RFC 3161 timestamping, W3C Verifiable Credentials, JSON canonicalization, and post-quantum signature practice. Its central contribution is an article-by-article and layer-by-layer reference mapping for producing independently verifiable evidence about AI system behavior. Version v1.0-preprint is derived from publication-prep rc4 and adds a structured failure-case appendix for broken evidence packages, completes a URL verification pass, and tightens claim-risk wording from compliance guarantees toward evidence-support formulations. The mapping is implementation-agnostic. The Agent Trust Framework (EATF) is used as a worked example because its artifacts are publicly observable. Tyche Institute is a research entity, not a trust service provider or qualified trust service provider, and this paper does not claim that EATF or any implementation certifies legal compliance.