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What is Blockchain?
In this article, we’ll explain what blockchain is, how it works, and why it is the technology behind cryptocurrencies like Bitcoin and Ethereum.
Definition
A blockchain is a decentralized digital ledger that records transactions across a network of computers.
Instead of being stored in one central location (like a bank database), the information is distributed across many computers worldwide.
This makes blockchain:
- Secure
- Transparent
- Tamper-resistant
- Decentralized
How Does Blockchain Work?
Blockchain is made up of “blocks” of data that are linked together in a chain.
Here’s how it works:
- A transaction is requested (for example, sending crypto)
- The transaction is broadcast to a network of computers (called nodes)
- The network verifies the transaction
- The verified transaction is added to a block
- The block is permanently added to the chain
Once recorded, the information cannot easily be changed. This creates trust without needing a central authority.
Why Is It Called “Blockchain”?
- Block → A group of verified transactions
- Chain → Blocks are linked together chronologically
Each new block contains a reference to the previous one, creating a secure and continuous chain of data.
What Makes Blockchain Different from Traditional Systems?
| Traditional Database | Blockchain |
|---|---|
| Controlled by one entity | Decentralized |
| Can be modified internally | Nearly immutable |
| Limited transparency | Public and transparent |
| Requires trust in authority | Trust through technology |
Blockchain removes the need for intermediaries by allowing participants to verify transactions collectively.
Who Verifies Transactions?
Transactions are verified by network participants:
- Miners (in networks like Bitcoin)
- Validators (in networks like Ethereum and others)
They ensure that transactions are legitimate before adding them to the blockchain.
What Is Blockchain Used For?
Blockchain is used for:
- Cryptocurrencies (Bitcoin, Ethereum, etc.)
- Smart contracts
- Decentralized finance (DeFi)
- Digital identity systems
- Supply chain tracking
Cryptocurrency is the most well-known use case, but blockchain technology has many applications beyond digital money.
How Blockchain Connects to Cryptocurrency
Cryptocurrency runs on blockchain technology.
Without blockchain, crypto transactions could not be verified securely or recorded transparently.
When you send or receive cryptocurrency, the transaction is permanently recorded on a blockchain network.
With services like FlashPay, you interact with blockchain when topping up your account using supported networks, but the spending experience remains simple and user-friendly.
Blockchain is the technology.
Cryptocurrency is one of its main applications.
You can activate different card types (LiteCard, SecureCard, PremiumVisa) depending on your needs, and even create multiple cards for different uses. FlashPay gives you the flexibility to top up through multiple supported networks and spend your crypto globally with ease.
Need Help?
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