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What is a blockchain?
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- In simple terms, blockchain is a digital ledger.
- A ledger is a book containing accounts to which debits and credits are posted from books of original entry.
- A blockchain is a digitized, decentralized, public ledger.
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Definition of Blockchain
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- The main chain (black) consists of the longest series of blocks from the genesis block (green) to the current block. Orphan blocks (purple) exist outside of the main chain.
- The blockchain is an incorruptible digital ledger of transactions that can be programmed to record virtually everything of value.
- Each list of records in a blockchain is called a block.
- So a blockchain is a continuously growing list of records called blocks, which are linked and secured.
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Who invented blockchain technology?
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- Blockchain Technology was invented by Satoshi Nakamoto in 2008 for use in the cryptocurrency bitcoin, as its public transaction ledger. Satoshi Nakamoto’s aim in creating the decentralized Bitcoin ledger—the blockchain—was to allow users to control their own money so that no third party, not even the government, would be able to access or monitor it.
- The creator of Bitcoin, Satoshi, disappeared back in 2011, leaving behind open-source software that the users of Bitcoin could update and improve.
- The invention of the blockchain for Bitcoin made it the first digital currency to solve the double spending problem without the need of a trusted central authority or central server.
- The Bitcoin design has been the inspiration for other applications.
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Internet Technology vs Blockchain Technology
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- In the 1990s, when internet technology (TCP/IP or HTTP) was in the native stages, email was the first major application. Later new applications like web browsers came. Websites became popular. People started using chat software like Skype. Now if you look at your mobile, see how many different applications are run using the Internet.
- Similarly, when blockchain technology emerged, bitcoin was the first major application that used it. Other cryptocurrencies followed the trend. Now, blockchain technology is used in a variety of applications like security, online voting, etc.
- Simply put, the Internet allows computers to exchange information; Blockchain allows computers to record information.
- Both use a lot of computers (nodes).
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Technologies behind blockchain technology!
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- Private Key Cryptography
- P2P Network (Peer-2-Peer)
- Program (the blockchain’s protocol)
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What is the need for blockchain technology?
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- The blockchain is a mechanism to bring everyone to the highest degree of accountability. No more missed transactions, human or machine errors, or an exchange that was not done with the consent of the parties involved.
- The most critical area where Blockchain helps is to guarantee the validity of a transaction by recording it not only on the main register but a connected distributed system of registers, all of which are connected through a secure validation mechanism.
- Blockchain technology can find applications in the following areas in the future:
- Smart contracts – Any industry heavily reliant on contracts, such as insurance, financial institutions, real estate, construction, entertainment, and law, would benefit from blockchain’s indisputable way of updating, managing, tracking, and securing contracts. Smart contracts, those that are embedded with if/then statements and are executed without the involvement of an intermediary, also use blockchain technology.
- Supply chain management – Whenever value changes hands or the status of an asset changes, blockchain is ideally suited for managing the process.
- Asset protection – Whether you’re a musician who wants to ensure you get royalties when your music gets played or a property owner, blockchain technology can help you protect your assets by creating an indisputable record of real-time ownership.
- Personal Identification – Governments manage vast amounts of personal data from birth and death records to marriage certificates, passports, and census data. Blockchain technology offers a streamlined solution for managing all of it securely.
- Payment processing – Blockchain has the potential to be highly transformative to any company that processes payments. It can eliminate the need for intermediaries that are common in payment processing today.
- Crowdfunding – As with traditional crowdfunding, a blockchain-powered crowdfunding campaign seeks to secure investment for a new project from an interested community. But in this instance, funding is most likely to come in the form of bitcoin or other cryptocurrencies.
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Blockchain technology – opportunities and advantages
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- The blockchain allows our smart devices to speak to each other better and faster.
- Blockchain solves the problem of manipulation. It brings everyone to the highest degree of accountability.
- Online identity and reputation will be decentralized. We will own the data that belongs to us.
- Cryptocurrencies take the power away from governments to control the value of currencies and hand it to people.
- The potential is great for people in the informal economy to exploit the blockchain’s middleman-free way to exchange assets.
- Blockchain technology can more equitably address issues related to freedom, jurisdiction, censorship, and regulation, perhaps in ways that nation-state models and international diplomacy efforts regarding human rights cannot.
- Blockchain-based systems allow for the removal of intermediaries involved in the record-keeping and transfer of assets.
- The removal of intermediaries and settlement on distributed ledgers allows for dramatically increased transaction speeds compared to a wide range of existing systems.
- Data entered on the blockchain is immutable, preventing fraud through manipulating transactions and the history of data. Transactions entered on the blockchain provide a clear trail to the very start of the blockchain allowing any transaction to be easily investigated and audited.
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Blockchain Technology – Criticisms and Challenges
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- Huge power required: Remember all that computing power required to verify transactions? Those computers need electricity. Bitcoin is a poster child of the problematic escalation in power demanded by a large blockchain network. That’s not appealing given today’s concerns about climate change, the availability of power in developing countries, and the reliability of power in developed nations.
- Security about the private key: The private key must remain secret at all times because revealing it to third parties is equivalent to giving them control over the bitcoins secured by that key. The private key must also be backed up and protected from accidental loss, because if it’s lost it cannot be recovered and the funds secured by it are forever lost, too.
- Transaction speed: Transaction speed is also an issue. As we noted above, blocks in a chain must be verified by the distributed network, and that can take time.
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