Scaling and layer 2
Begin with “Layer 2 and rollups” and work toward “Layer 2 scenario practice”. Each available lesson includes a visual explanation and a quick knowledge check.
Read in order or choose a topic below. Completion marks stay in this browser. All 20 lessons in this track are available.
- 01
Layer 2 and rollups
Do more work elsewhere, with verification tied back to Ethereum.
5 MIN READ - 02
Layer 1 versus layer 2
Execution can happen on another system while settlement relates back to Ethereum.
3 MIN READ - 03
What is a rollup batch?
Many local transactions can contribute to one published unit of information.
3 MIN READ - 04
Optimistic rollups explained
State claims can be accepted provisionally under a challenge mechanism.
3 MIN READ - 05
Validity rollups explained
A verifier checks a proof that a state transition follows the encoded rules.
3 MIN READ - 06
Fraud proofs and challenge periods
A dispute process needs evidence, access and time to work.
3 MIN READ - 07
Validity proofs and verification
The checked statement matters as much as the proof’s name.
3 MIN READ - 08
What is a sequencer?
An ordering service can give a rollup its immediate transaction sequence.
3 MIN READ - 09
Sequencer availability and escape paths
A fallback must work under the conditions where the ordinary path fails.
3 MIN READ - 10
Settlement versus execution
Running a transaction and committing to its accepted result are related but different stages.
3 MIN READ - 11
What is data availability?
Participants need access to the data required to reconstruct or check the system.
3 MIN READ - 12
Blob data in plain language
A separate data channel supports scaling use cases with specific access and retention rules.
3 MIN READ - 13
Bridges as separate risk systems
Moving claims between networks introduces additional verification and custody mechanisms.
3 MIN READ - 14
Canonical bridges versus third-party bridges
An ecosystem’s standard path and another service can use different mechanisms.
3 MIN READ - 15
Deposits and withdrawals
Cross-layer transfers have direction-specific steps and conditions.
3 MIN READ - 16
Why withdrawal timing differs
Proof systems, challenge rules and service models lead to different timelines.
3 MIN READ - 17
What is a sidechain?
A separate chain can connect to Ethereum while using a different consensus security model.
3 MIN READ - 18
Network IDs and chain IDs
Identifiers have protocol roles beyond a wallet’s editable display name.
3 MIN READ - 19
Compare scaling trust assumptions
Evaluate evidence, data and control rather than a single speed claim.
3 MIN READ - 20
Layer 2 scenario practice
Separate immediate feedback, publication, settlement and exit rights.
3 MIN READ