Porini's ERC-20 Smart Contract
This is Porini's ERC-20 smart contract, whose tokens can activate communities to support conservation activities and learn about blockchain technology.
Note 1: Upon customer's request, the token smart contract does not include pausable token transfers. Additionally, no
mint
andburn
,burnFrom
functions are included. Eventually, the token has 18 decimal digits and has a fixed minted supply of 21'000'000 (technically, this is achieved by calling theinternal
function_mint
in theconstructor
).
Note 2: It is important to understand that
decimals
is only used for display purposes. All arithmetic inside the contract is still performed on integers, and it is the different user interfaces (wallets, exchanges, etc.) that must adjust the displayed values according todecimals
.
Changelog
See the created CHANGELOG
file in this repository.
Installation
1. Install the Truffle Framework
We use the Truffle framework for the compilation, testing, and deployment. Please follow their guide to install the framework on your computer.
2. Getting Started
Run npm i
in order to install the necessary OpenZeppelin node modules as well as further required dependencies.
Compilation
To compile the contract, it is important that you have installed the project correctly, as we use external dependencies and contracts. Use the following command to compile the contracts:
truffle compile
Unit Tests
Since we build the ERC-20 smart contract on top of the audited OpenZeppelin node modules, there is no further requirement to write dedicated tests for these modules. Nonetheless, due to the fact that we integrate the non-standard permit
method, unit tests have been written for this specific extension.
You can run the tests with
npx hardhat test
Furthermore, if you need to test the permit
method on one of the live test networks, run the following command to generate the function parameters (assuming Node.js is installed):
node .\scripts\sign-data.js
Deployment
Local Deployment With Ganache
To deploy the contract on your local Ganache blockchain, you must first install the software on your computer. Follow the installation guide.
Once you installed the local blockchain, you can create a workspace. This is described here.
Note: We have observed that Truffle and Ganache do not use the same default RPC configuration. The easiest way to align is to adjust Ganache's server hostname, port, and network ID with Truffle's configurations (check the file
truffle-config.js
).
Once you are setup, just run:
truffle migrate --network development
Rinkeby
To deploy the smart contract to Rinkeby, you need to preconfigure first some things:
- Create a
secrets.json
file. - Create a MetaMask Wallet and paste the respective seedphrase into
secrets.json
. Make sure you got some ETH. You can get some here. - Create a new Infura project and copy the project key into
secrets.json
. - Create a Etherscan account and copy the API key to
secrets.json
. The file will look like the following (make sure to always.gitignore
it!):
{
"seedPhrase": "drip voice crush ...",
"privateKey": "0c7342ea3cdcc0...",
"owner": "0x3854Ca47Abc6...",
"projectId": "a657e3934de84d...",
"etherscanKey": "RQFAFV4DE1H75P..."
}
Now run the following command:
truffle migrate --network rinkeby
If the deployment was successful, you will get the final deployment result:
Copy the contract address and verify the contract right away so that you can interact with it. Run the following command:
truffle run verify PoriniCommunityToken@<CONTRACTADDRESS> --network rinkeby
If the verification was successful, you will see a similar result as follows:
PoriniCommunityToken@0x67A64D9F71AAa0bE4a7D3DEef91c2707F691983C
Pass - Verified: https://rinkeby.etherscan.io/address/0x67A64D9F71AAa0bE4a7D3DEef91c2707F691983C#contracts
Successfully verified 1 contract(s).
For more information, see here.
Note: The smart contract
PoriniCommunityToken.sol
does include thepermit
method, which can be used to change an account's ERC20 allowance (seeIERC20.allowance
) by presenting a message signed by the account. By not relying onIERC20.approve
, the token holder account doesn't need to send a transaction, and thus is not required to hold Ether at all.
Interaction
If you deployed the smart contract succefully, you are now able to interact with it.
Local Interaction With the Truffle CLI
To start the Truffle JavaScript console, please run:
truffle develop
In the console, you can create an instance of the provided contract by typing:
let i = await PoriniCommunityToken.deployed()
You can use the instance variable to call functions like symbol:
i.symbol()
Rinkeby
Go to the corresponding Etherscan link, e.g. https://rinkeby.etherscan.io/address/CONTRACTADDRESS#code. You are able to invoke READ and WRITE functions on the contract.
Test Deployments
The smart contract PoriniCommunityToken.sol
has been deployed across all the major test networks:
- Rinkeby: 0x67A64D9F71AAa0bE4a7D3DEef91c2707F691983C
- Ropsten: 0xeb8647302b2F97653452Ce1582E046e205D515bc
- Kovan: 0xbB5C47840930Af779042b6209c064B8Ac9247848
- Goerli: 0x667483ec1078c64f8D7e35B49152C3c2C87cCB56
Production Deployments on SustainabilityChain
The smart contract PoriniCommunityToken.sol
has been deployed to the SustainabilityChain network with Remix* and signed with the PoriniCommunityToken hardware wallet (Ledger Nano S):
- Contract creation transaction hash: 0xcbca637e085f83a84c6b0ec557de96868df4cf68e82a8737f5dff3db74f79788
- Contract address: 0x62DAE5fD87368F56aF3D576D4837523429DcE2b1
- Contract admin: 0xc4d8b0D2436D0E317958330E179A1787C8e38202
- Contract Application Binary Interface (ABI): Can be downloaded from the snippet. This file was copied from Remix after compilation.
Note 1: Make sure that you always copy the full smart contract ABI and not just one of the inherited interfaces!
Note 2: Remix uses checksummed addresses for the
At Address
button and if it's invalid the button is disabled. Always use checksummed addresses with Remix! One way to handle this is by using EthSum. The checksum algorithm is laid out in full detail here.
* Remix deployment configuration:
- Compiler:
0.8.6+commit.11564f7e
; - Language:
Solidity
; - EVM Version:
compiler default
; - Enable optimization:
200
; - Only the smart contract
PoriniCommunityToken.sol
was used for compilation and deployment. Remix imported the dependencies successfully (see here how this works in the background with the.deps
folder);
Further References
[1] https://docs.openzeppelin.com/contracts/4.x/erc20
[2] https://github.com/rkalis/truffle-plugin-verify