  Bitcoin draws the highest degree of attention among cryptocurrencies, while
coin mining is one of the most important fashion of profiting in the Bitcoin
ecosystem. This paper constructs fresh coin circulation networks by tracking
the fresh coin transfer routes with transaction referencing in Bitcoin
blockchain. This paper proposes a heuristic algorithm to identifying coin
miners by comparing coin circulation networks from different mining pools and
thereby inferring the common profit distribution schemes of Bitcoin mining
pools. Furthermore, this paper characterizes the increasing trend of Bitcoin
miner numbers during recent years.
