interface RealitioInterface {

    /// @notice Notify the contract that the arbitrator has been paid for a question, freezing it pending their decision.
    /// @dev The arbitrator contract is trusted to only call this if they've been paid, and tell us who paid them.
    /// @param question_id The ID of the question.
    /// @param requester The account that requested arbitration.
    /// @param max_previous If specified, reverts if a bond higher than this was submitted after you sent your transaction.
    function notifyOfArbitrationRequest(bytes32 question_id, address requester, uint256 max_previous) external;

    /// @notice Submit the answer for a question, for use by the arbitrator.
    /// @dev Doesn't require (or allow) a bond.
    /// If the current final answer is correct, the account should be whoever submitted it.
    /// If the current final answer is wrong, the account should be whoever paid for arbitration.
    /// However, the answerer stipulations are not enforced by the contract.
    /// @param question_id The ID of the question.
    /// @param answer The answer, encoded into bytes32.
    /// @param answerer The account credited with this answer for the purpose of bond claims.
    function submitAnswerByArbitrator(bytes32 question_id, bytes32 answer, address answerer) external;

    /// @notice Returns the history hash of the question.
    /// @param question_id The ID of the question.
    /// @dev Updated on each answer, then rewound as each is claimed.
    function getHistoryHash(bytes32 question_id) external returns(bytes32);

    /// @notice Returns the commitment info by its id.
    /// @param commitment_id The ID of the commitment.
    /// @return Time after which the committed answer can be revealed.
    /// @return Whether the commitment has already been revealed or not.
    /// @return The committed answer, encoded as bytes32.
    function commitments(bytes32 commitment_id) external returns(uint32, bool, bytes32);
}
function getHistoryHash(bytes32 question_id) external returns(bytes32);
/// @notice Returns the history hash of the question.
/// @param question_id The ID of the question.
/// @dev Updated on each answer, then rewound as each is claimed.