How does a blockchain work? Simply explained
How does a blockchain work?
Understanding the technical foundation of Web3: From transactions to immutable concatenation - simply explained.
A blockchain works like a digital, decentralized register. Transactions are stored in blocks, secured cryptographically and linked chronologically.
The special feature: There is no central instance. Many network participants manage the system together.
The block creation process
Transactions arise
Every blockchain begins with an action: someone transfers assets, a smart contract is triggered or a token is transferred. This information is sent to the network.
Validation by the network
Nodes (validators or miners) check the transaction: Is it valid? Is there credit available? It is only accepted after a successful check.
Block formation
Several checked transactions are combined into one block, including timestamp, own hash and the reference to the previous block.
Cryptographic concatenation
As each block contains the hash of its predecessor, a chain is created. Manipulating old blocks would invalidate the entire chain.
5. consensus mechanisms
The network uses defined rules to ensure that there is agreement on which block is valid:
Proof of Work (PoW)
Computing power determines block creation (example: Bitcoin). Manipulation is extremely expensive due to the high energy expenditure.
Proof of Stake (PoS)
Capital participation decides on validation (example: Ethereum). A modern, energy-efficient model.
Blockchain vs. classic database
Classic database
- Centralized control by one authority.
- Data can be administratively changed/deleted.
- Trust in the operator is necessary.
Blockchain
- Control distributed among many participants.
- Data is documented unalterably.
- Trust in mathematical rules (code).
Conclusion
Blockchain replaces centralized trust with distributed control - the basis for a fair, transparent internet.
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