What’s the difference between blockchain and centralized databases? 

BlockchainA blockchain is a type of distributed ledger technology. It is a huge database formed by blocks,cryptographically linked to each other, containing information such as transactions. These blocks are addedfollowing and centralized databases differ in structure and operation. Blockchain is a good solution when immutable, transparent data is required, while centralized databases are better suited to situations where frequent data changes are essential. 

The traditional centralized database : 

• Data storage: the traditional database stores and manages data on a centralized server. 
• Data modification: stored information can be edited, modified or deleted by administrators. 
• Data history: centralized databases generally contain only the most recent information. 
• Data security: the entity ensures the security of its database by deploying all necessary measures to prevent attacks. Security is therefore based on trust in the efforts made by the entity to protect itself. 

 
blockchain: 

• Data storage: data is distributed between several nodes, represented by a network of thousands of computers. Each nodeIn a blockchain network such as Bitcoin, a node is a computer that stores the entire ledger (all transactionssince the creation of a crypto asset) and transfers users requests to owns a copy of the blockchain. This blockchain is designed so that each block contains part of the previous block. How does blockchain technology work? 
• Data modification: blocks are secured by a cryptographic hashFootprint to identify initial data (sometimes unknown) by comparing it to other footprints. In cryptography, afootprint is the result of the application of an encryption software to a given message., so when the data in a block is modified, this results in a change to its hash. However, as this hash is included in the next block, it would be necessary to recalculate all hashes in subsequent blocks to maintain consistency. As a result, modification quickly becomes impractical as the chain lengthens. The blockchain is therefore immutable, enabling true traceability of the activities carried out. What’s more, modifications to the blockchain are made by consensusTruth admitted by all system participants. This doesn’t imply that it is the absolute truth or that it’sindisputable, it is the truth participants agree on. In crypto, algorithms beginning with, rather than by dedicated administrators. 
• Data history: The blockchain keeps a complete history of transactions since its creation.  
• Data security: Blockchain is highly secure thanks to several mechanisms. It avoids the risk of a single point of control, replicates data throughout the network, makes it difficult to modify, and makes the entire process public, while requiring consensus between participants to add data. These combined characteristics make blockchain a secure technology. 

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