Pith Number

pith:AEWCKPPJ

pith:2016:AEWCKPPJY3JS32XRVPEJJCPGKE

not attested not anchored not stored refs pending

Measuring the speed of light with ultra-compact radio quasars

John Jackson, Marek Biesiada, Shuo Cao, Xiaogang Zheng, Yuhang Zhao, Zong-Hong Zhu

arxiv:1609.08748 v2 · 2016-09-28 · 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{AEWCKPPJY3JS32XRVPEJJCPGKE}

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	2026-05-18T00:26:46.820293Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

012c253de9c6d32deaf1abc89489e651372ba297bc1a41940aef0d8ac8f9e7f0

Aliases

arxiv: 1609.08748 · arxiv_version: 1609.08748v2 · doi: 10.48550/arxiv.1609.08748 · pith_short_12: AEWCKPPJY3JS · pith_short_16: AEWCKPPJY3JS32XR · pith_short_8: AEWCKPPJ

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/AEWCKPPJY3JS32XRVPEJJCPGKE \
  | 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: 012c253de9c6d32deaf1abc89489e651372ba297bc1a41940aef0d8ac8f9e7f0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4931018fce13f615af55ec335096053454145bf55836d18324daeea4cfc9a807",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2016-09-28T03:17:56Z",
    "title_canon_sha256": "858f302f7cc2a77134a4ad117b6f93f431a4dc67238a6c65fc6a95067139d484"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1609.08748",
    "kind": "arxiv",
    "version": 2
  }
}