Tangem Wallet Pack of 2 - Secure Crypto Wallet - Trusted Cold Storage for Bitcoin, Ethereum, NFT's &

Tangem Wallet Pack of 2 - Secure Crypto Wallet - Trusted Cold Storage for Bitcoin, Ethereum, NFT's &
Key item features Ultimate Security: Generates a private key that remains on the card, safeguarding crypto and NFTs from hackers with EAL6+ certification and audited firmware. Versatile Compatibility: Manages over 13,000 tokens across 70+ blockchains, supporting DeFi, NFTs, and DeEx without wires, Bluetooth, or USB. Effortless Operation: Utilizes NFC for secure transactions via a mobile device and the Tangem app, enabling buying and selling crypto with various payment methods. Smart Backup: Features a second Tangem Wallet as a backup, eliminating the need for paper, pictures, or seed phrases for recovery. Durable Design: Boasts IP68 protection against environmental conditions, ensuring longevity and robust physical security. Comprehensive Support: Compatible with Bitcoin, Ethereum, Solana, XRP, USDT, and over 6,000 cryptocurrencies, integrating with dApps and WalletConnect.

LBANK

LBANK

What Is a Blockchain, and How Does It Work in Bitcoin?

What Is a Blockchain, and How Does It Work in Bitcoin?

A blockchain is a type of distributed database that stores information in a sequence of blocks. In the context of Bitcoin, the blockchain is a public record of confirmed transactions that is maintained and independently verified by network participants.

Each block contains a group of valid Bitcoin transactions, along with other data required to connect that block to the existing chain.

The term blockchain comes from this structure: information is stored in individual blocks, and each new block is cryptographically linked to the previous one.

How are blocks connected?

Every Bitcoin block contains a reference to the previous block through its block header.

This reference is based on a cryptographic hash. A hash is a fixed-length output generated from data. If the underlying data changes, the resulting hash also changes.

Because each block refers to the previous block, changing historical data would break the links between blocks.

For example:

Block A → Block B → Block C

Block B contains information derived from Block A, and Block C contains information derived from Block B. This creates an ordered chain of historical records.

Who maintains the blockchain?

The Bitcoin blockchain is not stored on a single central server.

Instead, many independent nodes maintain copies of the blockchain and verify new transactions and blocks according to the same protocol rules.

When a new block is received, a node independently checks whether it follows Bitcoin's consensus rules. A block that violates those rules is rejected, regardless of who created it.

This means that the validity of Bitcoin's blockchain does not depend on trusting a single company, government, or database administrator.

How is new information added?

Bitcoin users create transactions that spend existing transaction outputs.

Before a transaction can become part of the blockchain, it must satisfy the network's validation rules.

Valid transactions can be collected into a candidate block. Through Bitcoin's Proof of Work process, blocks compete to become the next accepted block in the chain.

Once a valid block is accepted and additional blocks are built on top of it, reversing its transactions becomes increasingly difficult.

Why is the Bitcoin blockchain difficult to change?

The blockchain is often described as immutable, but this should not be understood as meaning that changing history is mathematically impossible.

Rather, changing confirmed historical data would require overcoming several mechanisms simultaneously:

The cryptographic links between blocks The Proof of Work required to produce blocks Independent validation by nodes Competition from the rest of the network

An alternative version of the blockchain must still follow Bitcoin's consensus rules. Nodes do not accept changes simply because a participant has modified a local copy of the blockchain.

A simple way to understand it

A traditional database is usually controlled and updated by a central administrator.

Bitcoin's blockchain is different because multiple independent participants maintain and verify the same transaction history according to shared rules.

In simplified form:

Transactions → Validation → Block → Cryptographic link to previous block → Distributed verification

The result is a shared transaction history that can be independently verified without requiring participants to trust a central record keeper.

In Bitcoin, the blockchain is therefore best understood not simply as a chain of data blocks, but as part of a broader system combining cryptography, distributed validation, consensus rules, and Proof of Work.



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