Bitcoin

Bitcoin (BTC) definition: The original and most well-known cryptocurrency, invented by an unknown person or group, often referred to as digital gold.

Bitcoin (BTC) is the pioneering and most widely recognized cryptocurrency in the world. It introduced the concept of decentralized digital currency and blockchain technology, marking a revolutionary advancement in the financial landscape. Created by an individual or group using the pseudonym Satoshi Nakamoto, Bitcoin's emergence in 2009 marked the birth of the cryptocurrency era.

Learn more in our guide: What Is Bitcoin?

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By Michelle Legge • Head of Crypto Tax Education

Updated Sep 1, 2025

This article has been fact checked and reviewed as per our editorial policy.

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The information on this website is for general information only. It should not be taken as consulting professional advice from Koinly. Koinly is not a financial adviser. You should consider seeking independent legal, financial, taxation or other advice to check how the website information relates to you unique circumstances. Koinly is not liable for any loss caused, whether due to negligence or otherwise arising from the use of, or reliance on, the information provided directly or indirectly, by use of this website.