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Blockchain is a set of technologies that allow you to maintain a distributed ledger of data, structured as a chain of blocks containing transactions. It is often defined as “an saudi number finder incorruptible digital ledger of economic transactions that can be programmed to record not only financial transactions, but practically anything of value”.
To validate the changes to be made to the ledger, in the absence of a central body, the nodes must reach consensus (at least 51% of the nodes, ideally). Let's think of a system in which two people make an agreement: to validate it, witnesses are needed and the same thing happens in the blockchain environment.
The more nodes there are, the more secure the system becomes!
Table of Contents:
What are the characteristics of blockchain technology?
Blockchain: from Bitcoin to the Internet of Value
Token
Digital Citizenship
Cybersecurity and Blockchain
How does blockchain work?
Although it may seem complex, the way blockchain works is actually quite simple:
Each block usually includes a hash, which is a digital fingerprint of the new authenticated block that cannot be changed or modified later. This hash therefore uniquely identifies the block and allows it to be linked to the next block through its identification.
Each block contains several transactions, a hash that records information about the referenced block, and another hash with information about the previous block.