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Ethereum’s Second- Layer Projects Duke It Out for Dominance

Arbitrum and Optimism, the first rollups to launch, were welcomed with open arms by an Ethereum community desperate for a more usable blockchain network, and it was hoped that Ethereum app builders would move en masse to their cheaper shores rather than leave the ecosystem altogether in favor of newer blockchains (e.g., Solana) or less-secure sidechains (e.g., Polygon).