Where activity is moving.
WHAT A ROLLUP DOES
Executes transactions away from the main network, publishing data and proof to it.
WHY THAT SCALES
Many transactions share the cost of one settlement.
WHAT OPTIMISTIC ROLLUPS ASSUME
That published results are valid, unless challenged.
WHAT THE CHALLENGE PERIOD IS
A window during which fraud can be proven.
WHAT IT COSTS USERS
Delay when withdrawing to the main network.
WHAT VALIDITY-PROOF ROLLUPS DO
Prove correctness mathematically before settlement.
WHAT THEY PROVIDE
Withdrawal without a challenge delay.
WHAT THEY COST
Computational expense generating proofs.
WHAT BOTH INHERIT
Security from the network they settle to, to varying degrees.
WHAT THAT VARIATION DEPENDS ON
Whether data is published to the main network, and who can produce blocks.
WHAT A SEQUENCER IS
The party ordering transactions on the rollup.
WHY IT MATTERS
Most are currently operated by a single party.
WHAT THAT MEANS
Censorship and outages are possible, though funds generally are not at risk.
WHAT TO CHECK
Whether an escape route exists if the sequencer stops.
WHAT TO UNDERSTAND
That each network makes different trade-offs, and claims should be read with that in mind.
