Title: The Historical Significance and Key Features of Cryptocurrencies

Over the last decade, cryptocurrencies have altered the finance landscape in ways unthinkable a few years ago. These digital assets, backed by blockchain technology, present a new way for people to perform transactions, save money, and invest. This article unravels the historical significance of cryptocurrencies and presents some of their defining features.

Cryptocurrencies found their inception in the backdrop of the 2008 financial crisis when faith in traditional financial institutions began to wobble. Satoshi Nakamoto, an unknown individual or possibly a group of individuals, proposed a decentralized electronic cash system, or as we know today, Bitcoin. Though efforts had been made to create digital currencies in the past, they had been hampered by double-spending problems—the possibility of a user spending digital cash twice. Nakamoto's solution, achieved via blockchain technology, was the birth of the cryptocurrency industry.

Cryptocurrencies, with Bitcoin leading the way, marked a paradigm shift from traditional centralized financial systems to decentralization. They offered an alternative means of wealth storage and transfer that bypassed governments and banking systems. Besides, Bitcoin, with its finite supply, presented an attractive model resembling digital gold, assuring its users protection against inflation—an issue that has historically plagued many economies.

As cryptocurrencies gained prominence, they catalyzed numerous innovations resulting in thousands of new cryptocurrencies, a.k.a 'altcoins'. This democratization spurred the creation of decentralized finance (DeFi) applications, eliminating the need for intermediaries in financial transactions—thereby fostering financial inclusion globally.

Understanding the unique features of cryptocurrencies is integral to appreciating their position in the global financial ecosystem.

1. Decentralization: By design, most cryptocurrencies are free from a central authority like government or financial institutions. The implications are significant: reduced risk from political instability, protection from arbitrary freezes on assets, and in some cases, anonymous transactions.

2. Security: Cryptocurrencies are built on cryptographic algorithms, making them secure from fraudsters and hackers. Moreover, the inherent transparency of the blockchain further fortifies security, enabling any suspicious activities to be tracked and traced.

3. Limited Supply: The supply of many cryptocurrencies, like Bitcoin, is limited, preventing debasement through unlimited printing as seen in fiat currencies. This feature is particularly appealing to individuals wary of inflation.

4. Accessibility and Inclusion: Cryptocurrencies do not require any banking infrastructure, making them widely accessible. For billions of unbanked individuals worldwide, cryptocurrencies can unlock access to finance.

5. Profit Potential: With their speculative nature, digital assets like cryptocurrencies have opened up new avenues for high-yield investments. While this introduces volatility and risk, it also provides opportunities for enormous profits.

Cryptocurrencies have come a long way from their inception and continue to reshape the financial landscape with their disruptive potential. Despite the challenges, they command an ever-increasing following, testament to their historical significance and their unique features. Their evolution is a testament to technological progress and the power of decentralization—an area worth watching in the coming years.