Cross-input signature aggregation is a technique used in blockchain transactions to combine multiple signature proofs into a single signature. This means that instead of having a separate signature for each input in a transaction, all input signatures are aggregated into one, reducing the overall size of the transaction.
The impact of cross-input signature aggregation on reducing transaction sizes and fees is significant. By combining signatures, the size of the transaction data is reduced, allowing more transactions to be included in a block. This, in turn, helps in reducing the overall transaction fees as miners can fit more transactions in a block, leading to lower fees per transaction.
Overall, cross-input signature aggregation improves the efficiency of blockchain transactions by optimizing the use of signatures and reducing the associated costs for users.