Hi list,

I would like to share a BIP draft for transaction-wide cross-input
signature aggregation (CISA). It introduces a new witness version,
which enables Taproot-style key path spending where inputs can
aggregate their signatures.

Each input chooses between half-aggregation, full-aggregation, or an
explicit opt-out via a marker byte in its witness.
The aggregation schemes themselves are specified in the previously
shared BIP 458 (half-aggregation) and BIP 459 (full-aggregation)
drafts. Script path spending follows BIP 341/342 unchanged.

The BIP draft text can be found here:
https://github.com/fjahr/bips/blob/cf0d4f2142cd0504b16e86739167b1f7ab9a3a06/bip-XXXX.mediawiki

For inline comments, I have opened a mock pull request on my BIPs
repo fork:
https://github.com/fjahr/bips/pull/6

Feedback of any kind is much appreciated.

Best,Fabian

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