Which innovative retail authentication technology was first widely adopted by high-end military memorabilia dealers in 2015 to combat the growing problem of counterfeit WWII artifacts?

Throughout history, military memorabilia has created a specialized retail market where collectors and history enthusiasts seek authentic pieces of combat history. From Civil War uniforms to WWII helmets, this market combines historical significance with consumer product appeal. This poll tests your knowledge of how military memorabilia has been branded, marketed and authenticated in the consumer marketplace - an intersection of retail operations and historical preservation.

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Blockchain certification with immutable provenance records
Microchip embedding with GPS tracking capabilities
Holographic stamps with military-grade encryption
DNA marking spray with unique molecular signatures