Historical retrospective · Layer 2
Arbitrum One brought optimistic rollups to Ethereum users
Arbitrum One launched as an Ethereum scaling network using optimistic execution and a dispute process for posted state transitions.
Rollups bundle activity while relying on Ethereum for settlement and security components, though the trust model depends on implementation details.
The network helped make layer-two applications a mainstream part of Ethereum’s user experience.
Bridges, sequencers, upgrade keys and withdrawal delays are part of the practical security model users should evaluate.
Primary source
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