Over 250 Bitcoin (BTC) mined in the early days of the network moved after laying dormant for 15 years. According to big transaction tracking service Whale Alert, five 50 BTC transactions moved Bitcoin from the Satoshi era on Sept. 20. The Bitcoins from these transactions have been dormant for 15.6 years, except the first transaction moving BTC 15.7 years old. What is the Satoshi era? Satoshi era is an expression used to refer to the time when Bitcoin ‘s pseudonymous creator, Satoshi Nakamoto, was still active.