Which famous online retailer partnered with the Smithsonian in 2018 to create a blockchain-based authentication system specifically for WWII and Vietnam War military memorabilia?

The collection and sale of historical military memorabilia has become a significant niche market in recent years. From authentic WWII uniforms to Cold War artifacts, specialized retailers have emerged to meet collector demand. This poll tests your knowledge about one of the most unusual retail collaborations in military collectibles history that sparked controversy among historians and veterans alike. Can you identify the authentic partnership that changed how military artifacts are authenticated and sold?

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eBay's 'Valor Verified' program with the Smithsonian National Museum of American History
Amazon's 'Heritage Guarantee' with the Smithsonian Air and Space Museum
Etsy's 'Military Provenance Project' with the Smithsonian Archives of American Art
Sotheby's 'Battlefield Authenticated' with the Smithsonian Institution Archives