That’s because on May 17, 2011, the miner “midnightmagic” – for reasons that remain unlear – claimed a 49.99999999 block reward, rather than an even 50.
17 мая 2011 года, напрыклад, midnightmagic атрымаў узнагароду ў 49,9999999 за блок, а не ў 50.