Making Bitcoin More Private With CISA
summary
Cross-Input Signature Aggregation (CISA) compresses per-input Schnorr data so a transaction with many inputs can present one signature object; half signature aggregation is non‑interactive, easy to implement and yields about 20% more average transactions per block (roughly a 7–8% per‑transaction fee improvement after witness discount), while full signature aggregation gives smaller signatures but requires interactive multi‑party signing and new cryptographic proofs (musig2/frost work informs designs); a BIP draft and cisarresearch.org exist but full aggregation still needs security proofs and tooling.
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chapters (9)
- 0:00Start
- 2:37Remembering the Past and Discovering Cisa
- 5:13Cross Input Signature Aggregation
- 7:43Various Approaches to Signature Aggregation
- 9:58Incentivizing Participation in Coin Joins
- 12:22Privacy Tools and Cost Savings in Bitcoin Transactions
- 14:50Pushback and Perceptions of Soft Forks
- 17:22The Limited Potential of Signature Compression
- 19:58Signature Aggregation and Getting Involved
