Abstract: A computer implemented method for verifying merchandise authenticity may include the steps of: receiving a produced instance identification code and a merchandise descriptor for a merchandise instance; generating a first hash output using the produced instance identification code, the merchandise descriptor, and a manufacturer wallet address; storing the first hash output on a blockchain; receiving an acquired instance identification code for the merchandise instance from a client device of a consumer, preferably by scanning a merchandise tag of the merchandise instance with the client device; generating a second hash output using the acquired instance identification code, the merchandise descriptor, and the manufacturer wallet address; generating a third hash output using the acquired instance identification code, the merchandise descriptor, and a consumer wallet address; determining an authenticity output for the merchandise instance; and providing the authenticity output to the client device of the consume