It looks like you meant blockchain.

Blockchain is a digital ledger that records transactions across many computers. Instead of one central authority keeping records, copies of the ledger are distributed among participants in the network.
How it works
A transaction is created.
The transaction is broadcast to the network.
Network participants verify the transaction.
Verified transactions are grouped into a "block."
The block is linked to previous blocks, forming a chain.
The updated ledger is shared across the network.
Key features
Decentralization – No single organization controls the data.
Transparency – Transactions can be viewed by participants.
Security – Cryptographic techniques help protect records.
Immutability – Once recorded, data is very difficult to alter.
Common uses
Cryptocurrencies like Bitcoin and Ethereum
Smart contracts
Supply chain tracking
Digital identity systems
Asset tokenization
Simple analogy
Think of a blockchain as a shared spreadsheet that everyone can see. Every new entry must be agreed upon by the group, and once entered, it cannot easily be erased or changed.
If you'd like, I can also explain blockchain in simple terms, technical terms, or discuss how cryptocurrencies use blockchain.