A system for determining and verifying authenticity of a product unit comprising: a ledger system comprising at least two nodes; at least one product code attached to said product unit, said product code having an entry in said at least two nodes, said entry defining at least a current owner and a hash of product information; said system capable of self-executing computer code for providing a request for transfer of ownership of said product unit by initiating a request from a portal, and accessing a first node of the at least two nodes; quantifying a concensus of the product information from the first node to a second node; engaging a self-executed computer code via confirming said ownership between said first and second nodes; and forwarding a request to an owner; upon approval by the owner confirming a change of ownership by registering and confirming a change within said first and second nodes.
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