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## What is Hash? A One-Minute Introduction

A hash function is a cryptographic algorithm that converts input data of any length into a fixed-length output called a hash value. It is the cornerstone of blockchain and modern information security due to its one-way nature, determinism, and collision resistance. Learn more on [Wikipedia: Hash Function](https://zh.wikipedia.org/zh-tw/%E6%95%A3%E5%88%97%E5%87%BD%E6%95%B8).

## Core Role of Hash Functions in Blockchain

### How Blockchain Uses Hash to Protect Data

Blockchain uses hash functions to ensure data integrity. Each block's hash value links with the previous block, forming a secure chain. Any slight change will alter the entire chain, preventing tampering.

### Three Key Properties of Hash Functions

- **One-way**: Impossible to reverse from the hash value to original input.
- **Collision-resistant**: No two different inputs should produce the same hash.
- **Deterministic**: Same input always yields the same output.

## SHA-256 Explained: The Cryptographic Engine Behind Bitcoin

SHA-256 is the main cryptographic hash function used by <a href="/ja/price/bitcoin-btc" target="_blank" class="blog_inner_link">Bitcoin</a>. It belongs to the SHA-2 family and was designed by the NSA. It processes 64 rounds of logical operations to produce a 256-bit output with strong security.

### SHA-256 vs Next-Gen Hash Algorithms

| Feature           | SHA-256  | Next-Gen Hash Algorithms |
| ----------------- | -------- | ------------------------ |
| Output Length     | 256 bits | Variable (256–1024 bits) |
| Speed             | \~1GB/s  | \~10GB/s                 |
| Quantum-Resistant | Weak     | Strong                   |
| Energy Efficiency | Medium   | High                     |

## Real-World Applications of Hash

### 1. Password Storage Security

Applications don’t store plain-text passwords. Instead, they store hashed passwords. Even if breached, the actual passwords are safe.

### 2. Digital Signatures & Block Verification

Blockchain transactions generate unique hashes for verification, making data immutable and verifiable.

### 3. Gate.io Case Study

As a leading crypto exchange, <a href="https://gate.io/" target="_blank" title="Gate.io">Gate.io</a> uses multi-layered hash verification to protect login credentials and user funds. Check their <a href="https://www.gate.io/zh/post/status/9943224" target="_blank" title="security blog">security blog</a> for more details.

## Trends in Hash Technology by 2025

### 1. Post-Quantum Hash Algorithms

To counter the threat of quantum computers, post-quantum hash functions are being developed to future-proof blockchain systems.

### 2. High-Performance, Energy-Efficient Hashing

New algorithms can handle massive data within milliseconds while reducing power usage, potentially cutting blockchain energy costs by 50% or more.

### 3. Zero-Knowledge Proofs for Privacy

Combining hash functions with Zero-Knowledge Proofs allows users to prove data validity without revealing content, ideal for financial and healthcare use cases.

## FAQ: Frequently Asked Questions

### Q1: What is a hash function?

A function that encrypts input into a fixed-length output. It is widely used for data security and verification.

### Q2: Why is SHA-256 important?

SHA-256 is Bitcoin’s core algorithm, offering high security and widespread adoption in blockchain systems.

### Q3: Are next-gen hash functions quantum-resistant?

Yes, new algorithms are designed to resist attacks from quantum computers, making them future-ready.

## Conclusion: How Hash Technology Shapes Blockchain’s Future

Hashing is a driving force in blockchain security, privacy, and sustainability. With advances in quantum resistance and privacy-preserving methods like ZKPs, hash functions will play a critical role in blockchain innovation across <a href="/ja/web3" target="_blank" class="blog_inner_link">Web3</a>, DeFi, healthcare, and digital sovereignty.

<div class="blog-details-info">
<div>Author: Gate.io Researcher Amao.C
<div class="info-tips">\*This article represents only the views of the researcher and does not constitute any investment suggestions.All investments carry inherent risks; prudent decision-making is essential.
<div>\*Gate.io reserves all rights to this article. Reposting of the article will be permitted provided Gate.io is referenced. In all cases， legal action will be taken due to copyright infringement.
</div>

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2025 Blockchain Hash Technology Explained: What is Hash? SHA-256, Use Cases & Future Trends