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4.1.4 Deployment and testing The contracts were initially developed and compiled using the Remix IDE. [35] We have found the IDE to be flexible and powerful enough for our needs and we used the latest version of solidity, which is 0.6.8, as advised in the docs, to compile the smart contracts. [36] First the contracts were deployed to a local test chain running in Ganache, which enabled us to test how the transactions worked and debug any issues. [37] Figure 4.1: Some of the addresses of local test chain running in Ganache. We connected the MetaMask wallet, which is a non-custodial wallet, [38] to one of the accounts in Ganache and using Remix we switched to the injected Web3 environment to deploy the smart contract to the local test chain. However, we were not yet able to test the smart contracts since there were no ERC-721 token in local test network, so we decided to deploy our own "Basic ERC- 721" token. We used the OpenZeppelin ERC721Full smart contract to inherit all the func- tions of an ERC-721 token and deployed it, as it can be observed in Figure 4.2. Doing so enabled us to have our own ERC-721 tokens and mint new tokens, approve addresses and use safeTransferFrom to interact with our smart con- tracts. After testing the Loans smart contract and the Leasing smart contract we have decided to deploy them to a live testing network of Ethereum. We had to choose one of the following test networks that are available: [39] • Ropsten • Kovan • Rinkeby • Görli They all have different properties, such as different consensus algorithms and were launched by different teams. We chose to deploy to Rinkeby because it is also the test network of choice for OpenSea. [29] 43PDF Image | NFT finance Leveraging Non-Fungible Tokens
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