Registry 1 · snapshot 1

The VER Registry

A record that uses a token outside the sixteen the specification defines must name the snapshot that registers it. Seeding is not opening, and the distinction is the point.

4Value spaces32 entries

2026-08-25Snapshot datesnapshot 1

Namespace	Value space	Status	Entries
provenance_action	provenance.chain[].action	open	16
perceptual_alg	identity.perceptual[].alg	seeded-closed	2
source_class	embeddings[].source.class	seeded-closed	8
segment_family	metadata.raw[].segment	seeded-closed	6

Registry policy and governance The snapshot itself

record fragment

"provenance": {
  "registry": {
    "registry_version": "1",
    "snapshot": 1,
    "sha256": "f6306609bb82062f3e4eca77f98e20d8dcd394af2c94f381ed45a34b1478e629"
  },
  "chain": [ { "action": "normalize" } ]
}

provenance.chain[].action

provenance_action

Opened by VER 1.1 draft §2.3 (ADR-0004): provenance.chain[].action is a constrained string rather than an enum, and a bare token outside the sixteen this specification defines MUST be an active entry of the snapshot the Record names in provenance.registry. This is the only one of the four value spaces the 1.1 draft opens. The opening ships with §2.3, which does not ratify until ADR-0004's conditions C1-C5 are satisfied.

Token	Status	Registered	Tier	Definition
decode	active	1.0	core	The Asset was decoded to a pixel buffer.VER 1.1 draft §2.3
normalize	active	1.0	core	CPNP-1 was executed, producing the Canonical Buffer.VER 1.1 draft §2.3
embed	active	1.0	core	One or more vectors were computed.VER 1.1 draft §2.3
transcode	active	1.0	core	The Asset was re-encoded into another container or codec without geometric or tonal change.VER 1.1 draft §2.3
redact	active	1.0	core	Metadata was removed or replaced under 1.0 §7.5.VER 1.1 draft §2.3
import	active	1.0	core	The Asset entered the Producer's custody.VER 1.1 draft §2.3
publish	active	1.1	specification-registered	The Record, or a projection of it, was made available to parties outside the Producer.VER 1.1 draft §2.3
export	active	1.1	specification-registered	A rendition of the Asset was written out for consumption elsewhere.VER 1.1 draft §2.3
compose	active	1.1	specification-registered	Two or more Assets were combined into this one. Requires a `lineage` block (§3).VER 1.1 draft §2.3
upscale	active	1.1	specification-registered	Resolution was increased, by interpolation or by a model.VER 1.1 draft §2.3
crop	active	1.1	specification-registered	A sub-rectangle was selected.VER 1.1 draft §2.3
resize	active	1.1	specification-registered	Dimensions were changed without cropping.VER 1.1 draft §2.3
color_adjust	active	1.1	specification-registered	Tonal or colour values were altered (grade, curve, white balance).VER 1.1 draft §2.3
denoise	active	1.1	specification-registered	A noise-reduction operator was applied.VER 1.1 draft §2.3
generate	active	1.1	specification-registered	Pixel content was produced by a model rather than captured or edited.VER 1.1 draft §2.3
sign	active	1.1	specification-registered	A detached signature was computed over the Record and recorded in `provenance.signature` (E17). The event's `at` is the signing time and its `actor` is the signer.VER 1.1 draft §2.3, §2.3.3

identity.perceptual[].alg

perceptual_alg

Seeded, not opened. Draft §2.4 keeps identity.perceptual[].alg a closed two-value enum in the schema and states the intent to open alg and segment in the same revision that publishes the registry. Registering an algorithm here does not admit it into a Record: until that revision a new algorithm still requires a schema revision.

Token	Status	Registered	Digest bits	Input	Parameters	Definition
pdq/1.0	active	1.0	256	The Canonical Buffer (§4), never the Asset bytes and never a re-decoded or resized intermediate other than the algorithm's own defined preprocessing.	PDQ as published by Meta's ThreatExchange reference implementation, with that implementation's bit order, rendered as 64 lowercase hex characters.	PDQ perceptual hash of the Canonical Buffer; a 256-bit digest carried as exactly 64 lowercase hexadecimal characters.VER 1.0 §5; VER 1.0.1 errata annex E22
phash-dct/64	active	1.0	64	The Canonical Buffer (§4), never the Asset bytes and never a re-decoded or resized intermediate other than the algorithm's own defined preprocessing.	the 64-bit DCT perceptual hash in the form produced by the `imagehash` reference implementation (32×32 luminance DCT, 8×8 low-frequency block, median threshold, row-major, most-significant-bit first), rendered as 16 lowercase hex characters.	The 64-bit DCT perceptual hash of the Canonical Buffer, carried as exactly 16 lowercase hexadecimal characters.VER 1.0 §5; VER 1.0.1 errata annex E22

embeddings[].source.class

source_class

Seeded, not opened, with one condition beyond the other two spaces. Draft §2.4: source.class "additionally requires a grade assignment for each new class (E19) and MUST NOT be opened before the grade table is registry-backed." This snapshot carries the grade table — every entry below states its grade — which is the carriage half of that condition. The value space itself stays closed until the revision that opens it does so. Seeding is not opening.

Token	Status	Registered	Grade	Definition
ocr_pixels	active	1.0	A	Text recognized from the Asset's own pixels.VER 1.0 §8; VER 1.0.1 errata annex E19 (grade)
caption_auto	active	1.0	A-	A caption or description generated by a model from the Asset.VER 1.0 §8; VER 1.0.1 errata annex E19 (grade)
caption_human	active	1.0	B	A caption or description written by a person about the Asset.VER 1.0 §8; VER 1.0.1 errata annex E19 (grade)
alt_text	active	1.0	B	The alternative text published with the Asset by the page or platform that carried it.VER 1.0 §8; VER 1.0.1 errata annex E19 (grade)
title	active	1.0	B	The title published with the Asset.VER 1.0 §8; VER 1.0.1 errata annex E19 (grade)
description	active	1.0	B	The description published with the Asset.VER 1.0 §8; VER 1.0.1 errata annex E19 (grade)
surrounding_text	active	1.0	C	Text adjacent to the Asset in the page or document that carried it.VER 1.0 §8; VER 1.0.1 errata annex E19 (grade)
page_context	active	1.0	C	Text describing the page or document that carried the Asset rather than the Asset itself.VER 1.0 §8; VER 1.0.1 errata annex E19 (grade)

metadata.raw[].segment

segment_family

Seeded, not opened. Draft §2.4 keeps metadata.raw[].segment a closed six-value enum in the schema; opening is deferred to the same revision that publishes the registry. Registering a family here does not admit it into a Record.

Token	Status	Registered	Availability key	Definition
exif	active	1.0	exif	Exif metadata, as carried in the Asset's Exif segment.VER 1.0 §7.1; VER 1.0.1 errata annex E21
xmp	active	1.0	xmp	An XMP packet.VER 1.0 §7.1; VER 1.0.1 errata annex E21
iptc-iim	active	1.0	iptc	IPTC IIM metadata, the legacy IIM record set.The availability key for this family is spelled iptc; the two spellings denote one family and a Consumer MUST treat them as equivalent (E21).VER 1.0 §7.1; VER 1.0.1 errata annex E21
icc	active	1.0	icc	An embedded ICC colour profile.VER 1.0 §7.1; VER 1.0.1 errata annex E21
c2pa	active	1.0	c2pa	A C2PA manifest store.VER 1.0 §7.1; VER 1.0.1 errata annex E21
other	active	1.0	null	A preserved metadata segment belonging to none of the five named families.VER 1.0 has no availability key for this family, so a preserved other segment carries no availability state under 1.0.x (E21); draft §10.3 adds the key at 1.1.VER 1.0 §7.1; VER 1.0.1 errata annex E21

Beside the registry

What a claim can be measured against

A tolerance is only a claim if there is a set to measure it against, and a cross-producer pixel hash is only a claim if two decoders were evaluated against the same corpus.

3 spaces · 10 images

Reference sets

Every one of the 30 vector digests was measured from the committed images, not asserted.

reference_set_version 1

verd-pillow/1

Decoder reference corpus

21 Assets pinning what a conformant decoder must produce, each with its content digest, dimensions and pixel hash.

ver-decoder-corpus/1