Smart Contract Structure (Solidity Example)
solidity
WrapCopy
// SPDX-License-Identifier: MITpragma solidity ^0.8.0;import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; // Standard ERC-20 tokenimport "@openzeppelin/contracts/access/Ownable.sol"; // For basic owner controlcontract MemeCoinStability is ERC20, Ownable { // Variables uint256 public constant BURN_INTERVAL = 30 days; // 30 days between burns uint256 public lastBurnTimestamp; // Time of the last burn uint256 public accumulatedFees; // Accumulated fees uint256 public burnPercentage = 2; // Initial burn percentage (2%) // Structure for change proposals struct Proposal { uint256 newBurnPercentage; // Proposed new percentage uint256 votesFor; // Votes in favor uint256 votesAgainst; // Votes against bool executed; // Whether the proposal has been executed uint256 deadline; // Voting deadline } mapping(uint256 => Proposal) public proposals; // Proposals by ID uint256 public proposalCount; // Number of proposals mapping(address => mapping(uint256 => bool)) public hasVoted; // Who has voted // Events for transparency event TokensBurned(uint256 amount, uint256 timestamp); event ProposalCreated(uint256 proposalId, uint256 newBurnPercentage, uint256 deadline); event Voted(address voter, uint256 proposalId, bool inFavor); event ProposalExecuted(uint256 proposalId, uint256 newBurnPercentage); constructor() ERC20("MemeCoin", "MEME") { _mint(msg.sender, 1000000 * 10**18); // Initial token supply (1M with 18 decimals) lastBurnTimestamp = block.timestamp; } // Function to collect fees (assumes the network sends fees here) function collectFees() external payable { accumulatedFees += msg.value; // Assumes fees are in native currency (ETH/BNB) } // Function for automatic burning function burnFees() external { require(block.timestamp >= lastBurnTimestamp + BURN_INTERVAL, "Too early for burn"); uint256 burnAmount = (accumulatedFees * burnPercentage) / 100; // 2% of fees require(burnAmount > 0, "No fees to burn"); accumulatedFees -= burnAmount; _burn(address(this), burnAmount); // Burn tokens from the contract lastBurnTimestamp = block.timestamp; emit TokensBurned(burnAmount, block.timestamp); } // Creating a proposal to change the burn percentage function createProposal(uint256 _newBurnPercentage) external { require(_newBurnPercentage <= 100, "Invalid percentage"); proposalCount++; proposals[proposalCount] = Proposal({ newBurnPercentage: _newBurnPercentage, votesFor: 0, votesAgainst: 0, executed: false, deadline: block.timestamp + 7 days // 7 days for voting }); emit ProposalCreated(proposalCount, _newBurnPercentage, block.timestamp + 7 days); } // Voting on a proposal function vote(uint256 _proposalId, bool _inFavor) external { Proposal storage proposal = proposals[_proposalId]; require(block.timestamp <= proposal.deadline, "Voting closed"); require(!hasVoted[msg.sender][_proposalId], "Already voted"); uint256 voterBalance = balanceOf(msg.sender); require(voterBalance > 0, "No voting power"); hasVoted[msg.sender][_proposalId] = true; if (_inFavor) { proposal.votesFor += voterBalance; } else { proposal.votesAgainst += voterBalance; } emit Voted(msg.sender, _proposalId, _inFavor); } // Executing a proposal after voting function executeProposal(uint256 _proposalId) external { Proposal storage proposal = proposals[_proposalId]; require(block.timestamp > proposal.deadline, "Voting still active"); require(!proposal.executed, "Already executed"); uint256 totalVotes = proposal.votesFor + proposal.votesAgainst; uint256 totalSupplyNow = totalSupply(); require(totalVotes > totalSupplyNow / 2, "Not enough votes"); // More than 50% of total supply if (proposal.votesFor > proposal.votesAgainst) { burnPercentage = proposal.newBurnPercentage; // Update percentage proposal.executed = true; emit ProposalExecuted(_proposalId, proposal.newBurnPercentage); } else { proposal.executed = true; // Proposal rejected but marked as executed } } // Function to display status (transparency) function getBurnInfo() external view returns (uint256, uint256, uint256) { return (accumulatedFees, burnPercentage, lastBurnTimestamp); }}
