Transaction: tx
Old State Root: R
New State Root: R'
Arithmetization
Proving
SNARK Proof
pragma solidity ^0.8.0;
contract ZkRollup {
bytes32 public stateRoot;
constructor(bytes32 _initialStateRoot) {
stateRoot = _initialStateRoot;
}
}
event Deposit(address indexed depositor, uint256 amount, uint256 index);
function deposit(uint256 amount) external {
require(msg.sender.transfer(amount), "Transfer failed");
uint256 depositIndex = ...; // Calculate deposit index
emit Deposit(msg.sender, amount, depositIndex);
}
event Withdrawal(address indexed recipient, uint256 amount);
function withdraw(
address recipient,
uint256 amount,
bytes calldata proof) external {
require(
verifyWithdrawalProof(recipient, amount, proof), "Invalid proof");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Transfer failed");
emit Withdrawal(recipient, amount);
}
function verifyWithdrawalProof(
address recipient,
uint256 amount,
bytes calldata proof) internal view returns (bool) {
// Implement the actual proof verification
// logic based on the chosen zk-proof system
}
event StateRootUpdated(bytes32 newStateRoot);
function updateStateRoot(
bytes32 newStateRoot,
bytes calldata proof) external {
require(verifyProof(newStateRoot, proof), "Invalid proof");
stateRoot = newStateRoot;
emit StateRootUpdated(newStateRoot);
}
function verifyProof(
bytes32 newStateRoot,
bytes calldata proof) internal view returns (bool) {
// Implement the actual proof verification
// logic based on the chosen zk-proof system
}