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_Follow along with the video_ --- ### Introduction In blockchain and cryptocurrency networks, the role of a **sequencer** is crucial for ordering and bundling transactions. Sequencers are operators that are responsible for organizing how transactions are processed. In many roll-up solutions, sequencers are centralized, controlled by a single entity. ### Centralization risks **Censorship and Manipulation**. Centralized sequencers have the power to selectively block or delay specific transactions. For example, users might experience blocked withdrawal transactions, preventing them from accessing their funds. Additionally, centralized control enables the manipulation of transaction order for personal gain. **Operational Downtime**. If a centralized sequencer experiences downtime, all transaction processing can halt. This means no transactions, including withdrawals, can be processed until the sequencer is back online. To mitigate the issues associated with centralized sequencers, projects like **zkSync** are working towards _decentralizing_ their sequencer operations, distributing control among multiple entities or nodes. ### Conclusion The centralization of sequencers in blockchain networks poses significant risks, including censorship, transaction manipulation, and operational downtime. Efforts to decentralize sequencers, such as those by zkSync, are crucial for enhancing the security, fairness, and reliability of these networks. ### đ§âđ» Test yourself 1. đ Explain what are the primary risks associated with centralized sequencers.
Why centralized sequencers can be problematic.
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Course Overview
About the course
Blockchain fundamentals
Introduction to smart contract gas
Introduction to wallets
Transaction signatures
Smart contracts
Advanced gas concepts
Security researcher
$49,999 - $120,000 (avg. salary)
Web3 developer
$60,000 - $150,000 (avg. salary)
Smart Contract Engineer
$100,000 - $150,000 (avg. salary)
Smart Contract Auditor
$100,000 - $200,000 (avg. salary)
Web3 Developer Relations
$85,000 - $125,000 (avg. salary)
Last updated on May 27, 2025
Duration: 3h 11min
Certification: Blockchain Basics
This proficiency exam is designed to confirm your understanding of all key concepts and learnings presented in the course material. You will have 45 minutes to answer 30 questions and score 18 to pass and earn a Certificate of Completion.
Course Overview
About the course
Blockchain fundamentals
Introduction to smart contract gas
Introduction to wallets
Transaction signatures
Smart contracts
Advanced gas concepts
Security researcher
$49,999 - $120,000 (avg. salary)
Web3 developer
$60,000 - $150,000 (avg. salary)
Smart Contract Engineer
$100,000 - $150,000 (avg. salary)
Smart Contract Auditor
$100,000 - $200,000 (avg. salary)
Web3 Developer Relations
$85,000 - $125,000 (avg. salary)
Last updated on May 27, 2025