JSA (James Spence Authentication)

JSA (James Spence Authentication) is the leading third-party autograph authentication firm in the world, founded in 2005 by renowned authenticator James Spence Jr. with over 30 years of industry experience. The company maintains an exemplar database of nearly 500,000 files to accurately assess thousands of autograph submissions daily, and is trusted by every major auction house in the country. In 2024, JSA was acquired by Certified Collectibles Group, further cementing its position as the gold standard in autograph authentication.