# Introduction to Bitcoin Bitcoin is an innovative technology that emerged in 2008, attributed to an individual or group operating under the pseudonym **Satoshi Nakamoto**. This groundbreaking concept was introduced through a seminal whitepaper titled **"Bitcoin: A Peer-to-Peer Electronic Cash System."** While the exploration of peer-to-peer digital cash systems dates back to the 1990s, these early attempts consistently faced a significant challenge known as the **"double-spending problem."** ### Understanding Double Spending **Double spending** refers to the risk that **a single unit of digital cash can be spent more than once**. Traditional systems relied on **trusted third parties** to oversee transactions and prevent this issue, which ultimately **undermines the goal of decentralization that Bitcoin sought to achieve**. Bitcoin's innovation lies in its ability to address this problem without the need for intermediaries, thus creating a trustless environment. While cryptography plays a crucial role in securing transactions, the true ingenuity of Bitcoin is found in its **economic design**, which effectively prevents double spending. This course will delve deeper into this economic solution, providing learners with a comprehensive understanding of how Bitcoin operates. ### The Bitcoin Ledger In conventional accounting practices, **ledgers** are utilized to track the flow of money as it is spent and received. Bitcoin builds upon this foundational concept by employing a **global ledger** that records and maintains the state of all Bitcoin transactions. This ledger is continuously updated and shared among all participants in the network, ensuring that every peer agrees on a single, unified state of transactions. When we refer to the **Bitcoin ledger**, we are discussing this global record that encompasses all transactions ever made using Bitcoin. This decentralized ledger is a critical component of the Bitcoin ecosystem, as it enhances transparency and security.
### Digital Scarcity Another pivotal concept introduced by Bitcoin is **digital scarcity**. Within the Bitcoin protocol, there exists a finite supply of bitcoins, capped at **21 million**. The smallest unit of a bitcoin, known as a **"satoshi,"** represents **1/100,000,000th** of a bitcoin. This limitation on supply ensures that no more than 21 million bitcoins will ever be created, establishing Bitcoin as a **digitally scarce asset**.
### Important to Note While the Bitcoin protocol laid the groundwork for these revolutionary ideas, it is important to note that not all implementations of the protocol have adhered to its original vision as articulated in the whitepaper. The **BSV blockchain** (Bitcoin Satoshi Vision) stands out as the only implementation that remains true to the original design and functionality of Bitcoin, offering both scalability and utility as a global ledger for payments and data.
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