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. 2025 Aug 27;14(17):3004. doi: 10.3390/foods14173004
Algorithm 9 Stakeholder Authentication and Access Control Contract
  •   1:

    Define struct Stakeholder

  •   2:

        Fields: role, isAuthorized

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  •   4:

    Define mapping(address ⇒ Stakeholder) stakeholders

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  •   6:

    Define modifier onlyAuthorized

  •   7:

        Require sender has valid role and authorization

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  •   9:

    function registerStakeholder(stakeholderID, role)

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          Verify sender’s permission

  • 11:

          Assign role and set authorization

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    end function

  • 13:

     

  • 14:

    function verifyAccess(stakeholderID)

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          Return stakeholder role and authorization status

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    end function

  • 17:

     

  • 18:

    function updateAuthorization(stakeholderID, status)

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          Only admin can modify authorization

  • 20:

          Update authorization status

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    end function