Definition ∞ Rollup trustlessness refers to the degree to which users of a blockchain rollup solution do not need to rely on external parties for its correct operation and security. This property is achieved when the security of the rollup is cryptographically guaranteed by the underlying layer-1 blockchain, typically through validity proofs or fraud proofs. Users can confidently transact on the rollup knowing that their assets are secure and that the rollup’s state transitions are valid, even if the rollup operator is malicious. True trustlessness is a hallmark of robust decentralized systems.
Context ∞ Rollup trustlessness is a central topic in news and technical discussions about the long-term viability and security of layer-2 scaling solutions. The debate often compares optimistic rollups and zero-knowledge rollups based on how quickly and strongly they achieve this property. Advancements in zero-knowledge proof technology are particularly watched for their potential to enhance rollup trustlessness and provide instant finality.
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