Blockchain is a decentralized digital ledger that records transactions across many computers in a network.
This means there is no central authority controlling the data.
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Transactions on the blockchain are grouped into "blocks".
Each new block is connected to the previous block, creating a "chain" of blocks - hence the name "blockchain".
Every time a new transaction occurs, a record of that transaction is added to every participant's ledger.
The decentralized network of computer nodes has to approve the transaction for it to be valid.
Blockchain uses cryptography to ensure the security and integrity of the data.
Each block contains a unique code called a "hash" that identifies it and links it to the previous block.
If someone tries to change a record in one block, the hash would change.
This would be detected by the network, as the hash in the following blocks would no longer match.
Blockchains are designed to be transparent.
The entire history of transactions is publicly viewable, although the identities of the participants are encrypted.
Blockchains do not require a central authority or middleman to process and verify transactions.
This is done in a distributed manner by the network participants.
Cryptocurrencies like Bitcoin are built on blockchain technology.
The blockchain keeps track of all Bitcoin transactions and ensures that each unit cannot be spent twice.
Blockchains can be used for more than just cryptocurrencies.
They can be used to store and manage any kind of digital information securely, such as property records, contracts, and supply chain data.
New blocks are added to the blockchain through a process called "mining".
Miners use computing power to solve complex mathematical problems and are rewarded with cryptocurrency.
Blockchains are designed to be tamper-resistant.
If someone tries to alter a record, the change would be visible to the entire network and rejected.
The blockchain network is maintained by a large number of computers around the world.
This makes it very difficult to hack or take down the entire system.
Blockchain technology enables "smart contracts" - self-executing contracts with the terms of the agreement between buyer and seller being directly written into lines of code.
Blockchains can provide transparency and traceability, for example in supply chain management, by allowing all participants to view the movement of goods.
No single person or entity controls the blockchain.
It is a decentralized and distributed digital ledger maintained by a network of computers.
Blockchain transactions are irreversible, meaning once a transaction is recorded, it cannot be altered or deleted without the consensus of the network.
Each block in the blockchain contains a timestamp and transaction data.
This creates an audit trail that can be used to track the history of any asset or transaction.
Blockchains use a peer-to-peer network, where each node (computer) on the network has a copy of the entire blockchain.
This makes the network highly resilient to single points of failure.
The decentralized nature of blockchains means they are resistant to censorship, as there is no central authority that can restrict access or remove information.
Blockchains have the potential to disrupt industries by providing a secure, transparent, and efficient way to record and transfer value without the need for intermediaries.