What it is
Provenance-stamping primitive that travels with model output. Records originating model, prompt hash, instrument, and timestamp.
The lightweight equivalent of a chain-of-custody marker for applied intelligence artifacts. Designed so any downstream consumer can verify what generated a given output without trusting the relayer.
Where it sits
TOKEN HEADER is catalogued under Infrastructure & Platforms in the instrument registry. Instruments in this group share a concern and are frequently composed rather than used alone; the related entries below are the nearest ones.
This is a registry entry: a real instrument, documented here, without a public endpoint a stranger can open. Pages carrying source excerpts and measured results are marked as such in the catalog. If you want detail on this one specifically, ask about it directly.