A blockchain-based data integrity multi-party high-efficiency audit mechanism (MBE-ADI) for the big data environment was proposed. A hybrid Merkle DAG structure based on data domain was built to organize data. and realized the simultaneous verification of a large number of unstructured data in the big data environment. In order to deal with the problem of large amount of data in the b... https://parisnaturalfoodes.shop/product-category/vitamin-b12-cyanocobalamin-1000mcg/