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OVMContextStorage.sol 365 Bytes
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// SPDX-License-Identifier: MIT

pragma solidity >=0.7.0;

contract OVMContextStorage {
    mapping (uint256 => uint256) public blockNumbers;
    mapping (uint256 => uint256) public timestamps;
    uint256 public index = 0;

    fallback() external {
        blockNumbers[index] = block.number;
        timestamps[index] = block.timestamp;
        index++;
    }
}