Define blockchain
History Timeline
Blockchain vs. Traditional Database
1. Definition of Blockchain technology: It is a decentralized digital ledger that records transactions across many computers securely, transparently, and permanently.
Key features:
Decentralization: No single authority controls it; power is distributed across all computers (nodes).
Immutability: Once added, blocks cannot be changed or deleted because altering one would break the chain's unique hash.
Consensus: The majority of nodes must agree a transaction is valid before adding it, preventing fraud like double spending.
2. History Timeline
Blockchain History Timeline:
1980s-1990s: Early research on cryptography and protecting digital data.
1991: Digital time stamping was introduced to protect digital documents from being altered.
1998: Early digital currency ideas, such as B-money and Bitcoin.
2008: Bitcoin white paper published; proposed a solution to double - spending.
2009: Bitcoin launched, becoming the first major successful blockchain-based cryptocurrency.
2015: Ethereum launched, introducing smart contracts and decentralized applications (dApps).
3. Blockchain vs. Traditional Database:
Note: Bitcoin -> uses blockchain technology
Bank-> typically uses a traditional database
Difference
| Blockchain | Traditional Database |
|---|
| Control | Decentralized - many nodes share control | Centralized - one organization controls it |
| Data | Difficult to change or delete | Can be charge or deleted by authorized users |
| Transparency | Transactions can be verified by participants | Data is usually private |
| |
|
Example:
Bitcoin uses blockchain, where many computers verify and record transactions. A bank uses a traditional database to controlled by the bank.
Control: Bitcoin; many computer verify transactions. Bank; control database.
Data: Blockchain is a confirmed Bitcoin transaction remains recorded. Bank; staff can update customer information.
Transparency: Bitcoin; transactions can be viewd publicly. Bank; customer records are private.
លំហសិក្សាកម្ពុជា
V1.0
មតិយោបល់ 0