Design notes

The arguments that produced the format.

A spec tells you what to write; these tell you why. Working documents, kept as written, dates and all, and not normative: where one disagrees with the spec, the spec wins, and the disagreement is worth reporting.

1. 01 Cairn (public page draft) still being finalized. "Cairn" is a working name; see [naming.md](naming.md).… 2026-08-28
2. 02 Research Brief: Audio File Format With Embedded Transcription Prepared for: Format research expert… 2026-03-17
3. 03 Proposal: Multi-Transcription Support in the Portable Meeting Format The Cassini Portable Meeting format (v1, `org.cassini.portable-meeting/1`) carries exactly one transcript per file. We propose a backward-compatible v2 that lets a single `.opus` file hold **multiple transcriptions of the same audio** — e.g… 2026-05-12
4. 04 How the operator guarantees the file exists Moved out of the specification: this describes how the Cassini operator produces and hands off portable meeting files, not what a portable meeting file *is*. Another producer could do this completely differently and still emit conforming fi…
5. 05 The format freeze the gocassini repo, each finding put through an adversarial verification pass; the measured claims were re-run in a checkout)… 2026-08-28
6. 06 The name is not decided Freeze item 5 wants the brand out of the wire, which means picking a string that gets frozen into every file: tag prefix, format id, media type, schema URL, spec title. It is the one decision on the freeze list that genuinely cannot be revi… 2026-08-28. Still open on 2026-09-01.
7. 07 Rollout plan, v1 that shipped.… 2026-03-11