Pith Number

pith:M3QDF2RT

pith:2024:M3QDF2RTWVSZO6BRYRVJNENGZF

not attested not anchored not stored refs pending

PKS 2131-021 -- Discovery of Strong Coherent Sinusoidal Variations from Radio to Optical Frequencies: Compelling Evidence for a Blazar Supermassive Black Hole Binary

A. C. S. Readhead, A. G. Sullivan, A. Synani, B. Molina, C. P. O'Dea, C. R. Lawrence, D. C. Homan, F. Harrison, I. Liodakis, J. A. Zensus, K. Chatziioannou, K. Tassis, M. C. Begelman, M. F. Aller, M. J. Graham, M. L. Lister, M. Vallisneri, P. Mr\'oz, P. V. de la Parra, R. A. Reeves, R. D. Blandford, R. Maiolino, S. Kiehlmann, S. K. N{\ae}ss, S. O'Neill, S. R. Kulkarni, T. A. Prince, T. Hovatta, T. J. Pearson, T. J. W. Lazio, V. Pavlidou, V. Ravi, W. Max-Moerbeck, Y. Ding

arxiv:2407.09647 v2 · 2024-07-12 · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{M3QDF2RTWVSZO6BRYRVJNENGZF}

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

Constraining Orbital Eccentricity of a Supermassive Black Hole Binary Candidate PKS 2131-0211

Receipt and verification

First computed	2026-07-05T10:47:54.923882Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

66e032ea33b565977831c46a9691a6c979bf7bc6a2410f25f128be8141895c66

Aliases

arxiv: 2407.09647 · arxiv_version: 2407.09647v2 · doi: 10.48550/arxiv.2407.09647 · pith_short_12: M3QDF2RTWVSZ · pith_short_16: M3QDF2RTWVSZO6BR · pith_short_8: M3QDF2RT

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/M3QDF2RTWVSZO6BRYRVJNENGZF \
  | 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: 66e032ea33b565977831c46a9691a6c979bf7bc6a2410f25f128be8141895c66

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5543825bdda8e559387817bf05946583a360cf3fd8002493500605d7d3ce8596",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2024-07-12T19:05:24Z",
    "title_canon_sha256": "e33a0f6d28c07df3c8f3c6d1622ef05dd2109d4f74646f7eea5f01720662b47a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2407.09647",
    "kind": "arxiv",
    "version": 2
  }
}