This article aims to consolidate knowledge acquired during my initial studies, exploring the history of cryptocurrencies and elucidating the path to understanding cryptocurrencies as an investment. Initially, the concept of decentralized currency and the creation of Bitcoin is presented, and then we discuss and explore the future possibilities of Bitcoin and cryptocurrencies.

*What is Bitcoin?*

Bitcoin is the first and most well-known cryptocurrency in the world, created in 2009 by an anonymous developer who used the pseudonym Satoshi Nakamoto. Since then, Bitcoin has become a global trend, attracting the attention not only of technology enthusiasts but also investors, governments, and institutions. It enables anonymous financial transactions without the need for intermediaries like banks. Transactions are recorded in a "ledger" called blockchain. The blockchain is public, meaning everyone can access it, and it is maintained by a network of computers around the world, as we will see throughout the article.

This idea of a decentralized currency already existed in the 1990s within the Cypherpunk community. Bit Gold, proposed by Nick Szabo in 1998, was the first digital currency with the concept of decentralization and digital scarcity. Before that, E-Gold (1996) and among other attempts to create decentralized currencies already existed, but they ended up becoming centralized and were shut down by governments.

Nakamoto left the community in 2011 and remained anonymous, abandoning his wallet with approximately one million BTCs across about 22 different addresses.

*The challenge of creation*

The missing feature for a non-fiduciary currency to be valuable was decentralization—meaning it is not controlled by any financial institution. This would make anonymous transactions possible and would be limited, making it impossible to "print" more coins and keeping its value against inflation. However, decentralization brought a challenge: how to ensure that a currency could only be used once? Imagine if you had a photo of a 100 reais bill and could use it to make multiple purchases! That would make the currency have no value at all. To solve this problem, coin mining was created.

At first, mining was done with simple tasks, like solving a simple "Captcha" (that challenge-response test to determine whether the user is a human or a robot). By solving the challenge, the user received Bitcoins as a reward. As the currency grew and gained value, mining became more complex and adjusted; therefore, the more expensive the currency became, the harder the challenge should be to mine it.

Nowadays, mining requires that a computer perform a complex task, using labor and energy, which validates the currency and prevents it from being used more than once. Thus, Bitcoin can only be used when it is exchanged for an equivalent task to its price, ensuring its value and security.

*The future of Bitcoin*

There are those who believe that Bitcoin will still rise to a million dollars. Others believe the currency has already lost its value and is nothing more than speculation. Personally, I believe Bitcoin will continue to be an important global financial asset and will be incorporated by the system (major banks, governments), which inevitably will make it controlled in some way. However, it will still retain its value in exchanges of services and products, masterfully controlling inflation, as no currency has managed to do so far, and permanently consolidating itself as a medium of exchange.