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Sensors 2021, 21, 3822 9 of 32 Algorithm 3 Create a NFT 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: 12: 13: 14: 15: 16: 17: 18: 19: 20: 21: 22: 23: 24: functionCREATENFT(tokentypestring,creatingfortransferbool,buyerstring,avail- ableassets int) invokerorg ← GetClientIdentity().GetMSPID() invokerclient ← GetClientIdentity().GetID() test ← tokentype + “_” + invokerorg switch test “EUnit_Org1MSP”or“EVUnit_Org1MSP” endorserorg = “Org3MSP” “InUnit_Org2MSP”or“GaUnit_Org2MSP” endorserorg = “Org1MSP” “StUnit_Org3MSP”or“EStUnit_Org3MSP” endorserorg = “Org1MSP” Default: “Invoker Organization and Token Type combination invalid” if creatingfortransfer == true then idval ← buyer + “_” + tokentype + “_” + GetTxID() owner ← buyer else idval ← invokerclient + “_” + tokentype + “_” + GetTxID() owner ← invokerclient end if tokennew ← NewToken(ID ← idval,TokenType ← tokentype, AvailableAssets ← availableassets, Owner ← owner) tokenJSON ← json.Marshal(tokennew) PutState(idval, tokenJSON) ◃ Saving new token SetTokenStateBasedEndorsement(tokennew.ID,invokerorg,endorserorg) endfunction ◃ Calling Algorithm 1 3.3.2. Bidding on a NFT Algorithm 4 illustrates how a buyer can bid upon a token of their choosing. The re- quested token is read using Algorithm 2 and checked if it is for sale and that there is no bid on this token already. If there is no bid, then the algorithm updates the bid field with the client identity of the buyer and commits it to state. As the token must be purchased in its entirety, there is no mention of the amount of energy assets in the bid. Algorithm 4 Bid on a NFT 1: functionBIDNFT(idstring) 2: token ← ReadToken(id) 3: if token.NotForSale == true then 4: return “Token ID not for sale” 5: end if 6: bidderclient ← GetClientIdentity().GetID() 7: if token.Bid == “” then 8: token.Bid = bidderclient 9: else ◃ Calling Algorithm 2 10: return “There is already a bid on this token by token.Bid” 11: end if 12: tokenJSON ← json.Marshal(token) 13: PutState(id, tokenJSON) 14: endfunction ◃ Saving updated tokenPDF Image | Blockchain Based Transaction System with NFT
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