1) Validity rollups use ZK-STARK proofs to scale blockchains while maintaining security and decentralization. The proofs allow transactions to be verified extremely quickly.
2) StarkNet is a validity rollup built by Starkware that aims to bring scalability and privacy to blockchains. It allows for permissionless deployment of smart contracts and transactions with composability between layers.
3) Starkware has developed key technologies like ZK-STARK proofs and programming languages like Cairo to build scalable rollup solutions. Their products StarkEx and StarkNet have seen significant adoption and development interest from the blockchain community.
Related topics: