Pith Number

pith:DWYBLCR5

pith:2009:DWYBLCR5AM6MJJHXQCIERDVOHV

not attested not anchored not stored refs pending

Black Hole Masses of Intermediate-Redshift Quasars: Near Infrared Spectroscopy

Dirk Grupe (Penn State University), Garching), Matthias Dietrich (The Ohio State University), S. Komossa (MPI fuer extraterretrische Physik, Smita Mathur (The Ohio State University)

arxiv:0901.3378 v2 · 2009-01-22 · 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{DWYBLCR5AM6MJJHXQCIERDVOHV}

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	2026-05-18T02:35:06.292456Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1db0158a3d033cc4a4f78090488eae3d753d099d4cde859edd4bbab801836157

Aliases

arxiv: 0901.3378 · arxiv_version: 0901.3378v2 · doi: 10.48550/arxiv.0901.3378 · pith_short_12: DWYBLCR5AM6M · pith_short_16: DWYBLCR5AM6MJJHX · pith_short_8: DWYBLCR5

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/DWYBLCR5AM6MJJHXQCIERDVOHV \
  | 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: 1db0158a3d033cc4a4f78090488eae3d753d099d4cde859edd4bbab801836157

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d3aac354d91787f619952edf2ee020cbdc7e3b5ebc54efc47f432d2af0679b79",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-01-22T18:32:36Z",
    "title_canon_sha256": "21adb552c19bb59e2917689de871455f5f0912e97f414a7600c1aac663cea567"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0901.3378",
    "kind": "arxiv",
    "version": 2
  }
}