LaunchGate

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;

interface ILaunchGate {
    function isOpen() external view returns (bool);
}

/// @notice Immutable scheduled launch gate shared by the public protocol entrypoints on one chain.
/// @dev A release remains closed until the first block whose timestamp reaches `opensAt`. No
/// transaction, account, or privileged role can open it early, delay it, or close it afterward.
contract LaunchGate is ILaunchGate {
    error InvalidOpeningTime();

    uint64 public immutable opensAt;

    constructor(uint64 opensAt_) {
        if (opensAt_ <= block.timestamp) revert InvalidOpeningTime();
        opensAt = opensAt_;
    }

    function isOpen() external view override returns (bool) {
        return block.timestamp >= opensAt;
    }
}