A blockchain is an open, distributed digital ledger capable of storing data records (usually, referred to as “transactions”) in a secure, verifiable and permanent manner. Once written, the data in a block cannot be retroactively altered without all subsequent blocks to it being modified, and this, due to the nature of the protocol and validation scheme, would require the consent of the majority of the network.
One or more transactions can be associated with a block, and each block also contains a hash pointer to the previous block and a time stamp.
Blockchain, //it.wikipedia.org/w/index.php?title=Blockchain&oldid=123499030 (22 ottobre 2021).
Technology created in 2009, to date there is no evidence of successful cyber attacks against a blockchain. Its security is divided into two levels:
1. All operations are guaranteed by the highest standards of computer encryption.2. The SW used is open-source, a guarantee of quality and speed in solving any potential problems.“
Once a block has been written on a blockchain, there is no going back, just like the grooves on a vinyl record.
You can add new ones but never revert back.
This, combined with the creation date (always present in a block), ensures that the information read is always true and consistent.”
A blockchain is composed of multiple servers (called nodes) connected to each other via the internet.
All nodes contain a copy of the ledger and perform the operations necessary to run the infrastructure.
The architecture is, therefore, completely distributed and no node is indispensable to its operation. No single point of failure.
Second-generation blockchains (such as Ethereum and 3Achain), in addition to storing transactions, can natively execute code on them, again securely.
This means that exchanges of information and value can be automated with complex logic and conditions at will. Automating transactions means you can automate your company’s processes.
Unlimited fields of application
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