Building Sybil-Resistant Anonymous Systems on Midnight: Mastering Historic Merkle Trees and Domain-Separated Nullifiers in Compact

If you have built decentralized applications on Ethereum or other EVM-compatible chains, you are intimately familiar with access control and state tracking:

// Traditional EVM Pattern: Zero Privacy

mapping(address => bool) public hasVoted;

function vote(uint256 proposalId, bool support) external {

require(!hasVoted[msg.sender], "Already voted");