Key Aggregation

Definition ∞ Key aggregation is a cryptographic technique that combines multiple distinct cryptographic keys into a single, compact key. This process allows for the verification of multiple signatures or proofs using only the aggregated key, significantly reducing the data size and computational overhead associated with verification. It is particularly valuable in blockchain systems where numerous transactions or attestations need to be verified efficiently, enhancing scalability and reducing on-chain storage requirements. Key aggregation supports more efficient and private digital asset operations.
Context ∞ Key aggregation is a topic frequently discussed in advanced blockchain protocol development news, especially concerning layer-one and layer-two scaling solutions. Its application is crucial for improving the efficiency of networks that process a high volume of transactions, such as those employing rollups or sharding. A key discussion involves the specific cryptographic schemes used for aggregation, like BLS signatures, and their security implications, as well as their potential to enhance privacy by obscuring individual signatories.