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. 2025 Aug 27;14(17):3004. doi: 10.3390/foods14173004
Algorithm 17 NFT-Based Product Certification Contract
  •   1:

    Define struct CertificationNFT

  •   2:

        Fields: productID, certifier, certificationDetails, timestamp

  •   3:

     

  •   4:

    Define mapping(address ⇒ CertificationNFT) certificationRecords

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  •   6:

    function mintCertificationNFT(product, certifier, certificationDetails)

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       Validate certifier’s authorization

  •   8:

       Generate NFT linked to product ID

  •   9:

       Store NFT details on blockchain

  • 10:

          Emit event NFTMinted(productID, certifier)

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    end function

  • 12:

     

  • 13:

    function verifyCertification(productID)

  • 14:

          Retrieve NFT certification details

  • 15:

          Return certification status

  • 16:

    end function

  • 17:

     

  • 18:

    function transferNFT(productID, newOwner)

  • 19:

          Validate ownership transfer request

  • 20:

          Update NFT owner

  • 21:

          Emit event NFTTransferred(productID, newOwner)

  • 22:

    end function