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Sensors 2021, 21, 3822 13 of 32 Algorithm 9 Bid on a FT 1: functionBIDFT(idstring) 2: token ← ReadToken(id) 3: if token.NotForSale == true then 4: return “Token ID is not for sale” 5: end if 6: if token.AvailableAssets < bidvalue then 7: Return “Available value token.AvailableAssets is less than bid bidvalue” 8: end if 9: bidderclient ← GetClientIdentity().GetID() 10: if token.Bidmap[bidderclient]! = nil then 11: token.Bidmap[bidderclient] ← existingval + bidvalue 12: else 13: token.Bidmap[bidderclient] = bidvalue 14: end if 15: token.AvailableAssets = token.AvailableAssets − bidvalue 16: tokenJSON ← json.Marshal(token) 17: PutState(id, tokenJSON) 18: endfunction 3.4.3. Transfer a FT ◃ Saving updated token ◃ Calling Algorithm 2 Algorithm 10 for transferring a FT, first reads the token using Algorithm 2 and verifies that the invoker client is the owner of the token being transferred. Then for each bid in the bid hashmap, it processes the value transfer to the buyer, using Algorithm 8. If the token for the buyer exists already, it is updated with the transferred value. Otherwise a new token is created for the buyer and a key level endorsement policy is set. The processed bid is now removed from the map. When all the bids have been processed and deleted, finally, it updates the token that was being transferred with the newly empty bid field into the state. As the value of available energy assets on the token is reduced by the value of the bid whenever a bid is placed, as explained in Section 3.4.2, the count of available assets on the token already reflects the value after deducting the bid amounts. Algorithm 10 Transfer a FT 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: 12: 13: functionTRANSFERFT(idstring) token ← ReadToken(id) invokerclient ← GetClientIdentity().GetID() if invokerclient != token.Owner then ◃ Calling Algorithm 2 return “The client invokerclient is not authorized to transfer token owned by token.Owner” end if for key, value ← range(token.Bidmap) do CreateToken(token.TokenType, TRUE, key, value) delete(token.Bidmap, key) end for tokenJSON ← json.Marshal(token) PutState(id, tokenJSON) endfunction ◃ Calling Algorithm 8 ◃ Save updated token after transfers 3.4.4. Redeem a FT Tokens in the FT implementation work like accounts, so when a FT is redeemed, some or all of the available energy assets may be redeemed, but the token itself not deleted as is the case for the NFT implementation described in Section 3.3.4. The Algorithm 11 for redeeming FT begins by reading the token using Algorithm 2 and checking that the invoker client owns the token and that the requested redeem amount is not greater than the totalPDF Image | Blockchain Based Transaction System with NFT
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