Pith Number

pith:CE2FVDFP

pith:2013:CE2FVDFPNBTZB3JEHHADPIG2DX

not attested not anchored not stored refs pending

Black-hole mass estimates for a homogeneous sample of bright flat-spectrum radio quasars

Andrea Lapi, Annalisa Celotti, Francesco Haardt, Gianfranco De Zotti, Gianluca Castignani, Luigi Danese

arxiv:1309.4108 v1 · 2013-09-16 · 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{CE2FVDFPNBTZB3JEHHADPIG2DX}

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	2026-05-18T01:47:37.022364Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

11345a8caf686790ed2439c037a0da1dc5153fcbe165777b028a35ff89b68cf6

Aliases

arxiv: 1309.4108 · arxiv_version: 1309.4108v1 · doi: 10.48550/arxiv.1309.4108 · pith_short_12: CE2FVDFPNBTZ · pith_short_16: CE2FVDFPNBTZB3JE · pith_short_8: CE2FVDFP

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/CE2FVDFPNBTZB3JEHHADPIG2DX \
  | 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: 11345a8caf686790ed2439c037a0da1dc5153fcbe165777b028a35ff89b68cf6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5cc2b4ab56639fccd86a365a0bb1b75f7efdb2dbd925719c1bbb9067112c9287",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2013-09-16T20:28:57Z",
    "title_canon_sha256": "1c81c6f30f4b6709b50aab24736b05e47b03d7a64d92375eb4cc4089f2b68480"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1309.4108",
    "kind": "arxiv",
    "version": 1
  }
}