● Interesting Fact ●
Blockchain is not eternal: old blocks can be lost.
Some users believe that blockchain is "forever." In reality, nodes are not required to store the entire blockchain, and old blocks are sometimes discarded to save space.
This does not threaten the network, but part of the history actually disappears (if not preserved by archival nodes).
And briefly, what is blockchain: ■ Blockchain is a digital database in which information is stored in the form of a chain of blocks.
Each block contains: a list of transactions, a timestamp, a link (hash) to the previous block.
These blocks are connected in a chain — and you cannot change one block without changing all subsequent ones, which makes blockchain very reliable and secure.
•Key properties:
Decentralization — stored not on a single server, but immediately by thousands of users.
Transparency — anyone can verify any transaction.
Impossibility of forgery — thanks to cryptography.
•Example:
When you send bitcoin to a friend:
1. Your transaction goes into a block.
2. The block is added to the chain.
3. All participants in the network receive an updated copy.