Wu said that according to Arkham monitoring, $15.95 million worth of Bitcoin (250 BTC) has just been transferred from 5 addresses that were active in the first month of Bitcoin's existence (January 2009). Each address received 50 BTC for mining one of blocks 2247, 2401, 2455, 2486, and 2690. The Bitcoins in these addresses have been dormant for nearly 16 years.