Cryptocurrencies have inarguably become a revolutionising factor, altering the norms of traditional financial systems. They have introduced an entirely new perspective to understand the monetary value and have started to reshape the financial landscape. While the novelty of cryptocurrencies is often the first talking point in many discussions, their roots and notable paradigm shifts date back to the late 20th century.

##Historical Significance of Cryptocurrencies

The idiosyncratic concept of the digital currency was first sketched out by technological visionaries in the early 1980s. However, it wasn’t until 2008 that the world was presented with a secure, anonymous, and decentralised network called Bitcoin. The creation of an individual or group named Satoshi Nakamoto, Bitcoin represented a significant shift from the traditional centralised financial system. This new system of currency paved the way for a new norm in finance, inspiring the creation of new cryptocurrencies.

Fast forward to today, the total market value of cryptocurrencies is worth billions of dollars with numerous digital coins available for trading. The widespread acceptance and adoption of cryptocurrencies have earned them a firm standing in the financial sector, carrying historical significance that marks the beginning of the digital finance era.

##Key Features of Cryptocurrencies

Decentralisation: Unlike the traditional financial systems governed by financial institutions and central banks, cryptocurrencies are decentralised. This means the management of transactions and the issuance of new tokens are collectively carried out by the crypto network.
Anonymity and Privacy: While every cryptocurrency transaction is traceable on the blockchain, the parties involved in the transactions can remain anonymous. This feature ensures the privacy of the parties involved in the transactions.
Security: Cryptocurrencies are based on cryptographic protocols which make them extremely difficult to counterfeit. Blockchain networks, the backbone of cryptocurrencies, incorporate the mechanism of distributed ledgers, which makes hacking almost impossible.
Lower Transaction Cost: As there isn't any intermediary involved in cryptocurrency transactions, the cost associated with transactions are typically cheaper compared to traditional mediums.
Accessibility: Considering that cryptocurrencies are internet-based payment systems, they are ubiquitously accessible. Anyone with a reliable internet connection can participate in cryptocurrency transactions irrespective of their geographical location.

Cryptocurrencies are not just reshaping our understanding of money but are also providing vast opportunities for innovation in the financial industry. They are disrupting traditional financial systems, aiming to democratise finance and provide a truly global financial network. It is no wonder that industry leaders, governments, and financial institutions are paying serious attention to this sector. The historical significance and key features of cryptocurrencies underpin their potential to be the financial rulers of the future.