---
title: "How does the security of a block works?"  
description: "How does the security of a block works?"  
author: "Sandra Emily"  
published: 2022-05-19  
canonical: https://answers.mindstick.com/qa/97499/how-does-the-security-of-a-block-works  
category: "troubleshooting"  
tags: ["troubleshooting", "blockchain"]  
reading_time: 1 minute  

---

# How does the security of a block works?

How does the [security](https://www.mindstick.com/articles/1671/wcf-security-in-dot-net-technology-using-c-sharp) of a block works?

## Answers

### Answer by Hitesh Vohra

- A **blockchain** is a series of blocks that hold transaction information. The most secure portion of a blockchain is the block. A cryptographic hash algorithm is used to secure a blockchain's record. Each block is linked to all previous and subsequent blocks by a unique hash pointer, which increases the block's security. When a value within a block is changed, the hash value changes as well. This hash is a security identifier that gives the entire blockchain a fair level of protection.
- To modify the block information, ambitious hackers also need to know the prior block's hash key. Blockchains are decentralised and spread across peer-to-peer networks that are constantly updated and continually syncing for those ambitious hackers. Blockchains have no single point of failure and cannot be modified by a single machine because the records are not stored in a central location.

\

**Read More: [Is it possible in Blockchain to remove one or more block from the networks?](https://answers.mindstick.com/qa/97473/is-it-possible-in-blockchain-to-remove-one-or-more-block-from-the-networks)**


---

Original Source: https://answers.mindstick.com/qa/97499/how-does-the-security-of-a-block-works

Copyright © MindStick Software Pvt. Ltd. This Markdown version is provided for developers, AI systems, and offline reading.