Pith Number

pith:P4D2U7RU

pith:2012:P4D2U7RUU5AYZMZT4OX6TBBSHT

not attested not anchored not stored refs pending

Massive black holes in central cluster galaxies

Luca Ciotti, Marta Volonteri

arxiv:1211.6840 v3 · 2012-11-29 · 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{P4D2U7RUU5AYZMZT4OX6TBBSHT}

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	2026-05-18T01:52:53.443363Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7f07aa7e34a7418cb333e3afe984323cfa1b736b4fac7b82bdac1315c7630f83

Aliases

arxiv: 1211.6840 · arxiv_version: 1211.6840v3 · doi: 10.48550/arxiv.1211.6840 · pith_short_12: P4D2U7RUU5AY · pith_short_16: P4D2U7RUU5AYZMZT · pith_short_8: P4D2U7RU

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/P4D2U7RUU5AYZMZT4OX6TBBSHT \
  | 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: 7f07aa7e34a7418cb333e3afe984323cfa1b736b4fac7b82bdac1315c7630f83

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "08650f01f219017019df96f7a5f7ad350a4dd96ae263e07e17e2d1275c4055f2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-11-29T08:26:35Z",
    "title_canon_sha256": "83f1a2e6205d23381d93a20d57f17a7bf5ec3ae235baa2336ed507bd1909c73f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1211.6840",
    "kind": "arxiv",
    "version": 3
  }
}