Technology · Beginner lesson · about 2 minutes
Layer 2
Faster and cheaper activity that still depends on a base blockchain in different ways.
The short answer
Layer 2 systems process activity away from a base chain and publish proofs or data back to it. Designs inherit different amounts of security and add operators, bridges, and withdrawal rules.
In plain English
Layer 2 systems process activity away from a base chain and publish proofs or data back to it. Designs inherit different amounts of security and add operators, bridges, and withdrawal rules.
The details differ by network and service, so use the linked sources and the project’s own documentation when a decision depends on current behavior.
What can go wrong
Read this before you act.
Sequencer downtime, upgrade keys, proof systems, data availability, and withdrawal delays can matter more than the advertised fee.
Check your understanding
A few questions. Not a test.
Pick an answer to see why it's right or wrong. There's no score to unlock.
Sources and corrections
This lesson is a starting point. The two sites below are good general places to learn more. Please tell us if something needs fixing.