Pith Number

pith:54WVBZWH

pith:2019:54WVBZWHD3DFA263VTXLU7DK6B

not attested not anchored not stored refs pending

A model independent constraint on the temporal evolution of the speed of light

Dandan Wang, Gong-Bo Zhao, Hanyu Zhang, Jinglan Zheng, Yuting Wang

arxiv:1904.04041 v1 · 2019-04-08 · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{54WVBZWHD3DFA263VTXLU7DK6B}

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.

Cited by

1 paper in Pith

Revisiting the Constancy of the Speed of Light: Galaxy Cluster Mass Bias Implications

Receipt and verification

First computed	2026-07-05T03:37:36.682648Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ef2d50e6c71ec6506bdbaceeba7c6af07c25bfae0f863d80c8f042c4714e637c

Aliases

arxiv: 1904.04041 · arxiv_version: 1904.04041v1 · doi: 10.48550/arxiv.1904.04041 · pith_short_12: 54WVBZWHD3DF · pith_short_16: 54WVBZWHD3DFA263 · pith_short_8: 54WVBZWH

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/54WVBZWHD3DFA263VTXLU7DK6B \
  | 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: ef2d50e6c71ec6506bdbaceeba7c6af07c25bfae0f863d80c8f042c4714e637c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f0513541984e78a93e9d36805ef749d9ad546f99839ae64409a7ed4e6183b6cc",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2019-04-08T13:15:56Z",
    "title_canon_sha256": "79e9b5b8c9a140a680c2444acf7d47faa1983784b72d5e55d049c7674649a11c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1904.04041",
    "kind": "arxiv",
    "version": 1
  }
}