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106 | // 1. 混币器合约
contract Mixer {
uint256 public constant DENOMINATION = 1 ether;
uint256 public constant MERKLE_TREE_HEIGHT = 20;
mapping(uint256 => bool) public commitments;
mapping(uint256 => bool) public nullifiers;
// 存款
function deposit(uint256 commitment) public payable {
require(msg.value == DENOMINATION, "Invalid amount");
require(!commitments[commitment], "Commitment already exists");
commitments[commitment] = true;
}
// 提款
function withdraw(
uint256 nullifier,
uint256[2] memory a,
uint256[2][2] memory b,
uint256[2] memory c,
uint256[] memory input
) public {
require(!nullifiers[nullifier], "Note already spent");
// 验证零知识证明
require(verifyProof(a, b, c, input), "Invalid proof");
nullifiers[nullifier] = true;
payable(msg.sender).transfer(DENOMINATION);
}
// 验证证明
function verifyProof(
uint256[2] memory a,
uint256[2][2] memory b,
uint256[2] memory c,
uint256[] memory input
) internal pure returns (bool) {
// 实现证明验证逻辑
return true;
}
}
// 2. 隐私代币
contract PrivateToken {
struct Note {
uint256 amount;
address owner;
uint256 nonce;
bool spent;
}
mapping(bytes32 => Note) public notes;
// 创建票据
function createNote(
uint256 amount,
bytes32 commitment
) public {
require(!notes[commitment].spent, "Note already exists");
notes[commitment] = Note({
amount: amount,
owner: msg.sender,
nonce: block.number,
spent: false
});
}
// 转移票据
function transferNote(
bytes32 oldCommitment,
bytes32 newCommitment,
uint256[2] memory a,
uint256[2][2] memory b,
uint256[2] memory c,
uint256[] memory input
) public {
require(!notes[oldCommitment].spent, "Note already spent");
require(!notes[newCommitment].spent, "New note already exists");
// 验证零知识证明
require(verifyProof(a, b, c, input), "Invalid proof");
notes[oldCommitment].spent = true;
notes[newCommitment] = Note({
amount: notes[oldCommitment].amount,
owner: msg.sender,
nonce: block.number,
spent: false
});
}
// 验证证明
function verifyProof(
uint256[2] memory a,
uint256[2][2] memory b,
uint256[2] memory c,
uint256[] memory input
) internal pure returns (bool) {
// 实现证明验证逻辑
return true;
}
}
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