Bitcoin (BTC) is a digital currency whose real story was hidden by the will of its mysterious creator. Similarly, there is no person responsible for issuing bitcoins and no one can ban usd to bitcoin exchange. The total number of BTCs is limited by a mathematical algorithm and cannot exceed 21 million. Thus, the digital currency has a limited offer, as well as gold. This article deals with the comparison of BTC and gold. Approximately every 4 years the number of bitcoins that are extracted by btc miner is halved. Thus, the mathematical algorithm supports digital currency deficit.