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. 2025 Aug 27;14(17):3004. doi: 10.3390/foods14173004
Algorithm 8 Supply Chain Data Integrity Contract
  •   1:

    Define struct ShipmentData

  •   2:

        Fields: temperature, humidity, location, timestamp, isValid

  •   3:

     

  •   4:

    Define mapping(address ⇒ ShipmentData) shipmentRecords

  •   5:

     

  •   6:

    Define event ShipmentAdded(sender, location, timestamp)

  •   7:

    Define event ShipmentUpdated(sender, isValid)

  •   8:

     

  •   9:

    Define modifier onlyOwner

  • 10:

      Require sender is contract owner

  • 11:

     

  • 12:

    function addShipmentData(shipmentID, temperature, humidity, location)

  • 13:

          Validate sender’s authorization

  • 14:

          Store shipment data in blockchain

  • 15:

          Emit event ShipmentAdded(sender, location, timestamp)

  • 16:

    end function

  • 17:

     

  • 18:

    function verifyShipmentData(shipmentID)

  • 19:

          Retrieve shipment details

  • 20:

          Return (temperature, humidity, location, timestamp, isValid)

  • 21:

    end function

  • 22:

     

  • 23:

    function updateShipmentStatus(shipmentID, isValid)

  • 24:

          Require sender has onlyOwner permission

  • 25:

          Update shipment validity status

  • 26:

          Emit event ShipmentUpdated(sender, isValid)

  • 27:

    end function