What is the Blockchain? – Logbook


A blockchain is essentially a digital record of all cryptocurrency transactions. It constantly grows as “completed” blocks are added with a new set of records.

Each block contains a cryptographic hash of the previous block, timestamp and transaction data.

Bitcoin nodes use the blockchain to differentiate legitimate Bitcoin transactions from attempts to resend coins that have already been spent elsewhere.

Cryptocurrencies such as bitcoin rely on a decentralized network of computers, each of which keeps a record of all transactions. The blockchain is a shared public ledger on which all transactions are recorded.

When someone wants to buy or sell bitcoins, they create a transaction. This transaction is then broadcast over the network and verified by the nodes. Once verified, it is added to the blockchain. The blocks are concatenated, with each block containing a hash of the previous block.

This ensures that no one can tamper with the blockchain. If someone tries to modify a transaction that has already been posted, their block will have a different hash from the rest of the chain and will be rejected by the network.

Use of the blockchain in three categories:

– Currency: Bitcoin, Ethereum, Litecoin etc. – Smart contract: Ethereum, EOS, Cardano – Decentralized applications (dApp): Ethereum, EOS, TRON Blockchain is a versatile technology that can be used in many different ways. Here are three of the most common uses:

  1. Currency

The best known use of the blockchain is the technology behind cryptocurrencies such as Bitcoin and Ethereum. Blockchain is used to create and track transactions in these currencies.

  1. Smart contracts

A smart contract is a digital contract that automates the execution of a contract. Smart contracts are often used to facilitate transactions on the blockchain.

3. Decentralized Applications (dApp) A decentralized application (dApp) is an application that runs on a decentralized network.

DApps are often based on smart contracts and use the blockchain to store data and track transactions.

Eric Esnault: The advantages of the blockchain

  1. Safety

Blockchain is a secure way to store data. The data is encrypted and only authorized users can access it. This makes it difficult for hackers to tamper with the data.

  1. Transparency

Blockchain is a transparent technology. All transactions are recorded on the blockchain and can be viewed by anyone. This transparency reduces fraud and corruption.

  1. Decentralization

Blockchain is a decentralized technology. It relies on a central authority to manage or control the network. This makes it resistant to tampering and censorship.

  1. Unalterable

The blockchain is tamper-proof. Once the data has been saved on the blockchain, it cannot be changed or deleted. So it’s an ideal way to store data that needs to be immutable.

  1. Efficiency

Blockchain is a more efficient way to store and track data. Eliminate the need for intermediaries such as banks and governments to verify transactions. This reduces costs and speeds up transactions.

Blockchain challenges

  1. Scalability

Blockchain is not scalable. The current infrastructure can only handle a limited number of transactions per second. This limits its use for large-scale applications such as payments and settlements.

  1. Private life

The blockchain is a public ledger. This means that all transactions are visible to all members of the network. This lack of privacy can be a concern for some users.

  1. Energy consumption

Blockchain is an energy-intensive technology. The extraction process requires a lot of energy and is not environmentally friendly.

  1. Regulatory uncertainty

There is regulatory uncertainty surrounding the blockchain. It is unclear how or if the technology will be regulated. This uncertainty could hinder its adoption in the future. Social profile

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