https://hrf.org/latest/cisa-research-paper/

• CISA lets multiple Schnorr signatures from different inputs be combined into a single signature, significantly cutting transaction size and saving fees.

• By making multi-input transactions cheaper, CISA incentivizes and normalizes usage of collaborative privacy tools like CoinJoin and PayJoin instead of normal transactions, strengthening user anonymity while also improving network efficiency.

• Businesses can enjoy significant savings particularly for consolidation transactions which should counteract UTXO set growth and speed up adoption by exchanges and ecommerce.

• There is no singular CISA concept, there are different aggregation modes (full and half aggregation) and scopes (transaction-wide and block-wide) and their trade-offs need to be weighed for an upcoming proposal.

• CISA requires a soft fork and further cryptographic research is needed for a proposal that maximizes the benefits for the network.