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Blockchain is a system of recording or databases that are widely distributed on the network. It is also called the distributed ledger. It is a system that does not use any third parties like banks or credit cards. In essence, records of transactions that have taken place are stored by many computers scattered on the network itself. 

So it will be harder to hack hundreds or thousands of computers, and chances are less for all the computers to experience interference at the same time. For example, if you pay for your lunch using bitcoin (one of the cryptocurrency), bitcoin for the payment of that lunch is transferred from your bitcoin address to the hotel's bitcoin address in a peer-to-peer manner.
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Blockchain is a decentralised technology system that stores data in a block structure with multi-party maintenance and uses cryptography to guarantee data transmission and access.

I've read a vivid analogy of its definition from What is Blockchain Technology: A and B lived in a same village and one day A borrowed money from B. B asked the village head C to be the witness to record the deal in case that A repudiate the debt. That might lead to "centralisation" because C is the only one with the rights to modify the account book. Gradually, villagers worry that C would embezzle money, so everyone gets an account book and they will be informed of each transaction by announcement. That is "decentralisation". Blockchain is similar to a public account book which allows everyone to record data.

The three most important features of blockchain technology are: decentralisation, tamper-proof and traceability. The first one is explained in the above example. Tamper-proof means that the information on the blockchain cannot be modified at will and traceability means all the data sources will be visible and clear on the blockchain. Because of this, it is expected to benefit many industries, such as the e-commerce. It can secure the online payment and allow people to keep track of the supply chain and logistics flow, thus preventing the counterfeit issues.

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Blockchain is main wallet or store for bitcoin and it's used for recieving and sending bitcoin to another bitcoin wallet and blockchain is used for trading and mining of bitcoins.
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Blockchain technology is a decentralized, distributed ledger that records the provenance of an advanced resource. And it is used to maintain the network.
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Blockchain is the digital, distributed and decentralized layer underlying most virtualized currencies. It is used for logging into the transactions without the use of the physical intermediate from the bank.
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Blockchain is a distributed data existing on multiple computers at the same time. It is constantly adding new sets of blocks are added to it. It is used to record transactions across many many computers so any involved record cannot be altered retroactively, without the alteration of all subsequent blocks. 
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Blockchain is a form of distributed ledger technology that offers a secure and reliable way to store and share digital information. It is a digital ledger of transactions, records, and contracts that is not stored in a single location, but rather on multiple computers that are distributed across the internet. This decentralized structure allows blockchain technology to be secure, transparent, and immutable. It also allows for faster and more efficient transaction processing and data sharing. Blockchain technology can be used to create digital contracts and smart contracts, as well as to track and manage digital assets and identities. This can help reduce fraud and reduce costs associated with traditional transactional processes. Blockchain technology is also helpful in streamlining processes and increasing efficiency, as well as providing greater security.
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Blockchain is a decentralized, digital ledger that records transactions in a secure and transparent manner. It is helpful for creating trust and reducing the need for intermediaries, as well as enabling secure and efficient transfer of assets, data, and information. It has applications in various industries such as finance, healthcare, supply chain management, and more.
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Blockchain is a distributed database that enables a secure didnt want to be just a mind in the things that we do. It helps us to keep track of our saves and to prevent data theft. Blockchain also helps us to create a shared history between different accounts and more importantly between users.
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Blockchain is a method of storing data that makes it difficult or impossible to update, hack, or defraud the system. A blockchain is simply a digital ledger of transactions that is replicated and distributed across the blockchain's complete network of computer systems.
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 A method of storing data that makes it difficult or impossible to update, hack, or defraud the system. A blockchain is simply a digital ledger of transactions that is replicated and distributed across the blockchain's complete network of computer systems.
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