You don't need a digital ledger - these are ODOP goods [0] so it's fairly straigtforward to identify authenticity based on the wholeseller's GI tag [1].

GI Tagging for ODOP products is taken extremely seriously as the products associated with ODOP tend to be associated with locally powerful khadi cooperatives and because this is a personal project of Modi and Shah as they started their political careers in Khadi Cooperatives and Amit Shah is the Cooperation (as in Cooperatives and Khadi) Minister, so complaints tend to be taken seriously. Additionally, textile cooperatives are extremely important in TN as well, and the TN government closely enforces it's GIs as well as building their own e-commerce platform and showrooms for selling cooperative goods [2].

[0] - https://www.investindia.gov.in/one-district-one-product

[1] - https://kancheepuram.nic.in/about-district/gi-tag-product-ka...

[2] - https://www.cooptex.com/