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    //! Consenus constants

    pub const BLOCK_MAX_FUTURE: i64 = 2 * 60 * 60; // 2 hours
    pub const COINBASE_MATURITY: u32 = 100; // 2 hours
    pub const MIN_COINBASE_SIZE: usize = 2;
    pub const MAX_COINBASE_SIZE: usize = 100;

    pub const RETARGETING_FACTOR: u32 = 4;
    pub const TARGET_SPACING_SECONDS: u32 = 10 * 60;
    pub const DOUBLE_SPACING_SECONDS: u32 = 2 * TARGET_SPACING_SECONDS;
    pub const TARGET_TIMESPAN_SECONDS: u32 = 2 * 7 * 24 * 60 * 60;

    // The upper and lower bounds for retargeting timespan
    pub const MIN_TIMESPAN: u32 = TARGET_TIMESPAN_SECONDS / RETARGETING_FACTOR;
    pub const MAX_TIMESPAN: u32 = TARGET_TIMESPAN_SECONDS * RETARGETING_FACTOR;

    // Target number of blocks, 2 weaks, 2016
    pub const RETARGETING_INTERVAL: u32 = TARGET_TIMESPAN_SECONDS / TARGET_SPACING_SECONDS;

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