How secure is cryptocurrency and blockchain technology? Security benefits and issues of DLT

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BII What is the purpose of cryptocurrency?
Cryptocurrencies are digital financial assets that are designed with the purpose of acting as a medium of exchange using the science of cryptography to secure transactions, create global currencies, eliminate government control and exchange rate issues, and control the creation of additional units of the currency.
Cryptocurrencies were introduced as a disruptive financial technology (fintech), which would make global transactions easier, faster, and more secure, putting control directly in the hands of the concerned parties. This could also eliminate banks and money transfer services.
The digital currencies claim to make storing, spending, and transferring "digital money" secure, super-fast, and unaffected by any fees, exchange rates, or governmental regulations.
The purpose of cryptocurrency and its underlying technology, however, is not limited to financial institutions, currencies, and transactions. Securitizing data, identity protection, creation of a decentralized economy, and storing personal data securely are a few of the initial purposes for which the blockchain technology was brought to life.
Although the uses of the blockchain technology behind cryptocurrencies is multifold, blockchain identity use cases are what is gaining the most traction from technology aficionados and enthusiasts worldwide.
Blockchain technology now can be used to identify applications in areas such as digital identities, passports, e-residency, birth certificates, wedding certificates, and other IDs. Is blockchain technology really secure?
A blockchain is a series of blocks that records data in hash functions with timestamps so that the data cannot be changed or tampered with. As data cannot be overwritten, data manipulation is extremely impractical, thus securing data and eliminating centralized points that cybercriminals often target.
Furthermore, private analysts say that the Pentagon believes the Blockchain Technology could be used as a Cybersecurity shield. In an article by The Washington Times, analysts deem that using blockchain, the technological backbone of bitcoin, could dramatically improve security across the U.S. military, preventing mega hacks, tampering, and cyber-hijackings of vehicles, aircraft, or satellites.
According to Dan Boylan of The Washington Times , the key to blockchain's security is that any changes made to the database are immediately sent to all users to create a secure, established record. With copies of the data in all users' hands, the overall database remains safe even if some users are hacked.
This tamper-proof, decentralized feature has made blockchain increasingly popular beyond its original function supporting bitcoin digital transactions. Many cutting-edge finance firms, for instance, have used blockchain to expedite processes and cut costs without compromising security.
Though blockchain has several advantages over other systems, there are still a few challenges in terms of compliance, regulations, and enforcement that will need to be addressed.
For example, regulatory issues demand clarity over jurisdictions and how to comply with KYC (Know Your Customer) and AML (Anti-Money Laundering) laws. But progressively increasing demand and acceptance by corporations would help overcome these challenges sooner than predicted. BII Uses of Blockchain Technology Security
Discussions revolving around blockchain technology have claimed that the technology can be used to initiate major changes in the security industry as a whole. It is often argued that the technology is not only effective in driving digital currency exchange, but also to strengthen existing security solutions and address security concerns globally.
Blockchain technology hopes to address multiple challenges associated with digital transactions such as double spending, data security, cross border transactions, chargebacks, frauds, and currency reproductions. Employing blockchain shrinks the costs associated with online transactions, all while concurrently increasing legitimacy and security.
Some of the proposed global security uses of blockchain technology are: The protection of sensitive records and authentication of the identity of a user, especially in the banking sector : Data manipulation can be spotted with the help of blockchain technology enabling banks to go beyond asymmetric encryption and caching in public keys. The deployment of blockchain enables authentication of users and devices without password protection. The decentralization of the network helps in generating consensus between different parties for verification through blockchain-based SSL certificates. The distributed and decentralized nature of the network that verifies the integrity of the transactions and associated account balances makes a successful attack mathematically impossible. Enhancing structural security of IoT devices : Certain block-less distributed ledgers are additionally enhancing structural security of...