If adopted, CISA could very well pave the way for more complex transaction types on Bitcoin, enhancing scalability and privacy without compromising security or adding wild stuff from the get go.
For Bitcoin that’d mean transactions are not just more private but also efficient.
Go learn some CISA here:
cisaresearch.org
cisaresearch.org/half-agg.html
Normally if Alice was to spend from multiple UTXOs, she'd sign each with a signature.
With CISA, these signatures could be aggregated into a single, compact signature reducing transaction size and enabling higher throughput by utilising well understood properties of Schnorr sig.
Afaik this aggregation uses a concept similar to MuSig, where multiple public keys are combined into one.
Alice would then sign with a private key corresponding to this aggregate public key.
What would this akshually enable?
• Privacy: More efficient CoinJoins.
By reducing the signature size, CISA could make privacy-enhancing transactions like CoinJoins cheaper encouraging use and privacy as standard.
• Cost: Lower transaction fees due to smaller tx sizes. 
What is CISA?
Cross-Input Signature Aggregation is a proposed enhancement for Bitcoin aims to reduce the number of signatures needed in Bitcoin transactions.
Instead of signing each input separately you could combine / aggregate them into one signature.
That's CISA. 
GM. 
This is Klaus, Klaus likes Bitcoin.
Also, Klaus is not real.
Klaus has been made using Flux 1. 
What’s real? 
GM. 
Can we overcome deceit and corrupted control? 
Free(dom). 
Feeding Moloch. 
Why Bitcoin? 
Thank you. I care about this and said this months ago to friends who didn’t give a fuck. THANK YOU FOR UNDERSTANDING MISA.
What are your go to bitcoin privacy tools nowadays?
Use Claude Artefacts.
Or even better, run local models. 