CISA
summary
Three BIPs now specify transaction-wide CISA: BIP 458 (half‑aggregation) produces non‑interactive post‑hoc aggregation that sums s values and yields roughly 50% signature byte savings per input; BIP 459 (full‑aggregation) uses the two‑round Dalia scheme to produce a constant‑size aggregate signature but requires an interactive signing session; BIP 460 defines a new witness version (v2, BC1Z) with per‑input opt‑in/opt‑out markers. On current averages this gives ≈7% fee savings, rising toward ≈30% for large consolidation or CoinJoin/PayJoin use; script‑path and post‑quantum compatibility are unresolved.
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chapters (13)
- 0:00CISA introduction
- 1:56CISA high-level overview
- 3:00Schnorr signatures soft fork
- 4:45CISA benefits for Bitcoin
- 8:17Half vs full aggregation
- 13:12Proposal details and changes
- 16:40Witness version adoption
- 20:37Security and malleability concerns
- 24:54Fee savings with CISA
- 27:20Performance and verification costs
- 29:48Quantum resistance in CISA
- 36:07Next steps and contributions
- 37:10Q&A
