ConfluxContext

这个合约可以用来查询Conflux网络信息，包括：

• epochNumber - 当前纪元号
• posHeight - PoS链的当前区块高度
• finalizedEpochNumber - （由PoS链）最新确定的PoW纪元号

ConfluxContext的hex40合约地址是0x0888000000000000000000000000000000000004

// SPDX-License-Identifier: MIT
pragma solidity >=0.4.15;

interface ConfluxContext {
    /*** Query Functions ***/
    /**
     * @dev get the current epoch number
     * @return the current epoch number
     */
    function epochNumber() external view returns (uint256);
    /**
     * @dev get the height of the referred PoS block in the last epoch
`    * @return the current PoS block height
     */
    function posHeight() external view returns (uint256);
    /**
     * @dev get the epoch number of the finalized pivot block.
     * @return the finalized epoch number
     */
    function finalizedEpochNumber() external view returns (uint256);
}