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uint256 tokenId, bytes memory data) public override returns (bytes4) { return this.onERC721Received.selector; } 2 3 4 5 6 Listing 4.1: Implementation to become compliant receiver of ERC-721 tokens 4.1.2 Leasing smart contract The first contract that we will go into detail about is the leasing smart contract. It will be used for the functionality of creating a new lease offer and storing it, as well as defining the mechanics of how the lease works. All the lease offers are stored in a mapping from LeaseID to LeaseOffer . The EVM has stack, memory and storage to hold variables for the smart contract and the storage is the most expensive. We have tried to keep the usage of storage to a minimum, however being the only location where the data is persistent we have chosen to keep the mapping of lease offers in this location. Each lease offer is a struct which contains the following components: • • • • • • • • • • uint leaseID : used to identify and query for a specified lease offer in the mapping. address payable lessor it to the . address payable lessee lessee : the address of the owner of the NFT who leases address smartContractAddressOfNFT : needs to be stored in order to call the ERC-721 functions of the tokens through the IERC721 interface using the tokenIdNFT to reference the exact NFT. uint tokenIdNFT uint collateralAmount : the amount guaranteed by the lessee in case they fail to return the NFT. uint leasePrice : the amount that has to be paid by the lessee to the lessor representing the rental payment. uint leasePeriod : the unix equivalent to the maximum duration that the asset can be leased for. uint endLeaseTimeStamp : the sum of the leasePeriod and the current Epoch time at the moment a lessee accepts the offer. Status status : an enum that represents the 4 possible states of a lease offer. The States of the Offer are: • Pending: The Lease Offer is on the market but no lessee has accepted it. 36PDF Image | NFT finance Leveraging Non-Fungible Tokens
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