✅ Master Sequencer Mechanics
Understand ordering strategies, MEV risks, and decentralization
Watch how rollups batch transactions
Your Progress
0 / 5 completed🎓 Key Takeaways
Let's review what you've learned about sequencer queues, transaction ordering, and the path to decentralization.
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Sequencer Role
- •Central coordinator for L2 transaction processing
- •Orders transactions and creates batches
- •Provides fast pre-confirmations (~100ms)
- •Currently centralized in most L2s
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Ordering Strategies
- •FIFO: Simple but vulnerable to spam
- •Gas Price: Revenue generation, enables MEV
- •Fair Ordering: Cryptographic fairness guarantees
- •Hybrid approaches emerging in practice
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MEV & Censorship
- •Sequencers can front-run and sandwich users
- •$50M+ annual MEV extraction on L2s
- •Censorship protection via forced inclusion
- •Private mempools and MEV-share as mitigations
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Decentralization Path
- •Stage 1: Single sequencer (current)
- •Stage 2: Rotation among permissioned set
- •Stage 3: Sequencer committee with consensus
- •Stage 4: Fully decentralized (target 2025-26)
🧪 Knowledge Check
Test your understanding of sequencer queues and transaction ordering. Get 4 or more correct to complete the module!
1. What is the primary role of a sequencer in L2 rollups?
2. Which ordering strategy provides the strongest censorship resistance?
3. What is a sandwich attack in the context of sequencers?
4. What is the main benefit of forced inclusion queues?
5. What approach do 'based rollups' use for sequencing?
← Decentralization Path
Complete the quiz to finish this module