Pith Number

pith:CZYT4PYG

pith:2020:CZYT4PYGD2FKYZNZJDMXRRCMRV

not attested not anchored not stored refs pending

What Drives the Redshift Evolution of Strong Emission Line Ratios?

Brent Groves, Fuyan Bian, Lisa J. Kewley, Michael A. Dopita

arxiv:2002.02976 v1 · 2020-02-07 · astro-ph.GA

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{CZYT4PYGD2FKYZNZJDMXRRCMRV}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-07-05T00:41:59.108857Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

16713e3f061e8aac65b948d978c44c8d71571228fd3dd85e7c76f3613469c147

Aliases

arxiv: 2002.02976 · arxiv_version: 2002.02976v1 · doi: 10.48550/arxiv.2002.02976 · pith_short_12: CZYT4PYGD2FK · pith_short_16: CZYT4PYGD2FKYZNZ · pith_short_8: CZYT4PYG

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/CZYT4PYGD2FKYZNZJDMXRRCMRV \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 16713e3f061e8aac65b948d978c44c8d71571228fd3dd85e7c76f3613469c147

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0a6ce5497128518edc4ed2d55e663cdf6f01b21fd2edb7c9400cd947acc591d5",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2020-02-07T19:00:04Z",
    "title_canon_sha256": "219f16e011a5c5465e783c0f4c990dfb05d9f2b6444ccfc880565f038b44c588"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2002.02976",
    "kind": "arxiv",
    "version": 1
  }
}