What Are Layer 2 Sequencers? The ULTIMATE Guide to Sequencers, Shared Sequencers & Polygon AggLayer

An exploration of the different kinds of sequencers that Layer 2 (L2) blockchains have today, including centralized sequencers, decentralized sequencers, shared sequencers, and Polygon's AggLayer.
📚 Resources 📚
- Slides: gateway.pinata.cloud/ipfs/Qmb...
- Polygon Announcement Blog: polygon.technology/blog/aggre...
- L2Beat: l2beat.com/scaling/summary
- Metis (Decentralized Sequencer L2): www.metis.io/
- Inscriptions Video: • We Need To Talk About ...
- Polygon zkEVM Video: • What Is Polygon zkEVM?...
- Polygon zkPoS Video: • Polygon's Biggest Chan...
⌚Timestamps ⌚
0:00 Introduction
2:00 What Are L2 Sequencers?
8:15 Centralized Sequencers
20:44 Decentralized Sequencers
25:41 Shared Sequencers
36:51 Polygon AggLayer
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[@allanjunli]

Great video as usual, you're now my favourite web3 educator!

[@theone8625]

Briliant breakdown! 🎯💯🔥🤙🏿😉

[@danielakpobare]

Thank you, this was really good.

[@leizhang9876]

Great content!

[@jannimcflurry8252]

Cant wait to eat snacks and watch this one!

[@litDevYT]

I see what you did there 😅

[@senthilsamrat24]

can we find the node which is centralised sequencer? so that we can propagate tx faster ?

[@sushilsaha6419]

Can you please create a video or point us to a document that provides details on trusted state created by sequencers, virtual state and the different kinds of states (virtual batches, verified batches, forced batches)

[@marcoscarlomagno3065]

I'm still a bit skeptical about "Optimistic confirmations", by that mechanism, a low reputation chain (Chain A) can compromise a big one (Chain B), e.g. by cross swapping tokens between chain A and B. Then if the Chain A sequencer misbehaves, it enforces to potentially rollback 1 hour of transactions on Chain A, which IMO is insane

[@locked2778]

🙂

[@sirnawaz]

35:00. Why not use both decentralized and shared sequencers? Decentralized sequencer for work when you do NOT need interoperability, and use shared sequencer for work when you do need interoperability?

[@sirnawaz]

Please keep the slides on the left of yourself, so that you do not block/hide parts of your slides.