Starknet
StarkNet, a decentralized Validity-Rollup, operates as an Ethereum Layer-2 scaling solution.
What is Starknet?
StarkNet is a Zero-Knowledge Rollup (ZK-Rollup) that is decentralized, permissionless, and censorship-resistant. It supports general computation over Ethereum. Developers create applications on StarkNet allowing users to send transactions the same way they do with Ethereum today. All StarkNet transactions are periodically batched, and their validity is proven on a stark proof, which is then verified on the Ethereum Blockchain.
Web3 dapps and developer tools related to Starknet
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XPLA 
Polygon
XDC Network
Developer resources from Alchemy
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Starknet alternatives
Explore web3 competitors and apps like Starknet.
Saakuru
Cartesi
GOSH