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Sensors 2021, 21, 3822 8 of 32 does not support rich querying. So, we accomplish this with the use of range queries in Hyperledger Fabric which takes a start and end value of the ID and returns the list of tokens that have IDs that fall between the values or are equal to the provided values. This means that the client would be expected not only to create IDs having a lexically serialized order, but also remember the first and last token IDs to provide to the query function. If a client were to forget the range to use they would lose access to tokens outside that range. This would be untenable, so our smart contract takes over the task of generating IDs. When creating the the ID of any token, the client identifier and token type must be included in the ID so as to enable range queries allowing the user to query for all tokens they own of a particular type. In case of NFT, this poses a challenge as multiple tokens can have the same owner and token type, so we need to add in a unique identifier to the ID to distinguish between different tokens each having the same client and token type. We could have saved the maximum value ID used in the system, or per client as a token and refer to that each time a token is created, ensuring that the number is unique across the entire system. Setting a centralized maximum value would need that token to be referred in every single transaction involving that client, creating a bottleneck and slowing down the process. Instead, the transaction ID which uniquely identifies the transaction within the scope of the channel was used and the ID for NFT of is the form: ID: clientid_tokentype_transactionID 3.3.1. Creating a NFT Algorithm 3 describes the creation of NFTs. The algorithm starts by checking the client’s identity and the identity of the organization of which the client is a part. It then conducts a check to make sure that the invoker organization is permitted to create the requested token type and sets value of the additional organization apart from the invoker that must be added to the endorsement policy. The ID and Owner of the token will depend on whether the token is being created as part of a transfer to a buyer or is being created for the invoker. Algorithm 5 uses Algorithm 3 in order to create a token for a buyer, as will be described in Section 3.3.3. After creating and committing the new token, Algorithm 1 is called to set the key level endorsement policy to override the chaincode level policy. This algorithm accepts the ID of a token in the world state and the organizations that will be included in the new endorsement policy. It instantiates a new policy, adds the requested organizations and commits it. Algorithm 1 SetTokenStateBasedEndorsement 1: 2: 3: 4: 5: 6: 1: 2: 3: 4: 5: function SETTOKENSTATEBASEDENDORSEMENT(id string, issuerorg string, en- dorserorg string) endorsementPolicy ← statebased.NewStateEP() endorsementPolicy.AddOrgs(statebased.RoleTypePeer, issuerorg, endorserorg) policy ← endorsementPolicy.Policy() SetStateValidationParameter(id, policy) endfunction Algorithm 2 ReadToken functionREADTOKEN(idstring) tokenJSON ← GetState(id) token ← json.Unmarshal(tokenJSON) return token endfunctionPDF Image | Blockchain Based Transaction System with NFT
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