Input

new

    /// Build a new input from the data required to identify and verify an
    /// output being spent.
    // 创建

commitment

    /// The input commitment which _partially_ identifies the output being
    /// spent. In the presence of a fork we need additional info to uniquely
    /// identify the output. Specifically the block hash (to correctly
    /// calculate lock_height for coinbase outputs).
    // 获取数据