2008 is the year of creation of the Bitcoin network consisting of a decentralized database, which is storing all transactions of bitcoin tokens, whose quantity is predetermined by a protocol and independent of any authority. The aim of this article is to describe the limits in the use of Bitcoin as medium of exchange. Bitcoin network operation is carried out at high costs of electrical energy consumption, which, will over time be reflected in the price of transactions. Low transaction prices, which is one of the main arguments of Bitcoin promoters, are only possible with continuous issuance of new bitcoins to circulation. Bitcoin's - "prove of work" - is the most energetically demanding method from all currently existing methods securing cryptoplatforms. Halving mechanism which reduces the rewards of miners create pressure to decrease hash rate, which is a reflection of the rate of network security. The pressure to decrease hash rate is for now overrun by the increasing efficiency of mining devices. The future will therefore probably bring us fundamental questions: What will it mean for Bitcoin network, if the real costs of running the network will be reflected in costs of transaction? How will Bitcoin network be able to compete with other cryptocurrencies, whose operation is carried out at a much lower cost? Will halving mechanism ultimately cause a declined hash rate, and thereby also a reduction in network security?