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Sensors 2021, 21, 3822 11 of 32 type queried for as input and gets the invoker client’s ID to create start and end values for the range query by padding to the right to create alphanumeric strings of the same length as the transaction ID in order to get the smallest and largest possible transaction IDs. This returns an iterator which loops through to produce the list of tokens to be returned to the user. Algorithm 7 Get my NFT 1: functionGETMYNFT(tokentypestring) 2: ownerclient ← GetClientIdentity().GetID() 3: checkstr ← ownerclient + “_” + tokentype + “_” 4: resultsIterator ← GetStateByRange(checkstr + pad(0, 64), checkstr + pad(z, 64) 5: defer resultsIterator.Close() 6: var tokens []*Token 7: for resultsIterator.HasNext() do 8: queryResponse ← resultsIterator.Next() 9: token ← json.Unmarshal(queryResponse.Value) 10: tokens ← append(tokens, token) 11: end for 12: return tokens ◃ Returns all tokens of tokentype for requesting client 13: endfunction 3.4. Implementing Energy Assets as FT FT are those that are for all intents and purposes identical. Thus they can be broken up and traded in parts, and added up like currency. Each client will have at most six tokens, one of each type of tokens EUnit, EVUnit, InUnit, GaUnit, StUnit and EStUnit. Additional tokens, whether created or purchased will be added to this token value. Tokens redeemed or sold will be reduced from the token value. Thus tokens for a given client in the FT implementation act as accounts, where each client has at most six accounts. The ID of the token in the FT implementation is of the form: ID: clientid_tokentype Also, as mentioned in Section 3.1, in the FT implementation a token can have multiple bids from the same or different buyers. In order to accomplish this we implemented the Bid field as a hashmap. The hashmap stores a list of key value pairs where key stores the identity of the bidder and the value stores the bid amount. The Bid field thus takes bids on the token and keeps adding bids to the hashmap. If the same bidder bids multiple times on a token, the value for that client key is updated with the total of the bids. 3.4.1. Create a FT Algorithm 8 for creating a FT first verifies that the invoking client is from an organiza- tion that is allowed to create the requested type of token. Additionally, it sets the appropriate additional organization needed to endorse this token as described in Table 1. The token ID depends on whether the token is being created for the invoker or for transfer to a buyer. Next, the algorithm will check if the token exists by trying to read it. As this is a FT implementation, if the token exists already, a new token will not be created but the requested energy asset count will be added to the existing token. If it is not found, this means that the invoker (if creating for self) or buyer (if creating for transfer) does not already own a token of this type. If so, a new token is created with the appropriate ID, supplied token type and energy asset count and added to the world state. Moreover, the applicable key level endorsement policy is set using Algorithm 1.PDF Image | Blockchain Based Transaction System with NFT
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