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Sensors 2021, 21, 3119 8 of 23 Table 3. Pseudo-codes of the functions related to the creation and configuration of smart NFTs. createToken: Creates a New Token Linking a Device BCA Address to a TokenId Input: _device, _owner Output: tokenId Require manufacturer = = msg.sender Generate new tokenId Set owner of tokenId = _owner Set state of tokenId = Waiting for owner Set BCA address of tokenId = _device Set timestamp = block timestamp Return tokenId updateTimestamp: The device updates the attribute timestamp of its token Set timestamp of tokenFromBCA(msg.sender) = block timestamp setTimeout: The owner of the token sets its attribute timeout Input: _tokenId, _timeout Require owner of _tokenId = = msg.sender Set timeout of _tokenId = _timeout checkTimeout: Checks if the device remains bound to its token Input: _tokenId if timestamp + timeout < block timestamp then return false else return true Table 4. Pseudo-codes of the functions of smart NFTs related to the definitions of new owners and users. TransferFrom: Transfers a Token from an Owner to a New Owner Input: _old_Owner, _new_Owner, _tokenId Require {owner, operator, approved} of _tokenId = = msg.sender if checkTimeout = = true then Set user BCA address from _tokenId = _user and Set {dataEngagement, hashK_UD} = 0 and if _user = = 0 then Set state of _tokenId = Engaged with owner and else Set state of _tokenId = Waiting for user and Send event UserAssigned else Send event TimeoutAlarm setUser: The owner assigns a user to the token Input: _tokenId, _user Require state is Engaged with owner, Waiting for user or Engaged with user and owner of _tokenId = = msg.sender if checkTimeout = = true then Set user BCA address from _tokenId = _user and Set {dataEngagement, hashK_UD} = 0 and if _user = = 0 then Set state of _tokenId = Engaged with owner and else Set state of _tokenId = Waiting for user and Send event UserAssigned else Send event TimeoutAlarm The pseudo-codes of the functions startOwnerEngagement, startUserEngagement, owner- Engagement, and userEngagement are shown in Table 5. The functions startOwnerEngage- ment and startUserEngagement, which are executed by the owner and user, respectively, save the public data dataEngagement and the hash of the secret they propose to share. The functions ownerEngagement and userEngagement, which are executed by the device, check if the device agrees with the secret. If the checking is successful, the token state changes from Waiting for owner to Engaged with owner and from Waiting for user to Engaged with user, respectively.PDF Image | Binding IOT to Smart Non-Fungible Tokens Using PUF
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