Pith Number

pith:WFTESCPH

pith:2008:WFTESCPHMTQIE2BU3KIJVZ5EDV

not attested not anchored not stored refs pending

On the radiative efficiencies, Eddington ratios, and duty cycles of luminous high-redshift quasars

(2) Institut de Ciencies de l'Espai, 3), (3) Institucio' Catalana de Recerca i Estudis Avancats), David H. Weinberg (1) ((1) The Ohio State University, Francesco Shankar (1), IEEC-CSIC/ICREA, Jordi Miralda-Escude'(2, Martin Crocce (2), Pablo Fosalba (2)

arxiv:0810.4919 v2 · 2008-10-27 · astro-ph · 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{WFTESCPHMTQIE2BU3KIJVZ5EDV}

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	2026-05-18T02:35:14.136833Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b1664909e764e0826834da909ae7a41d7b31717cc3436de2eadc02d8be4b1050

Aliases

arxiv: 0810.4919 · arxiv_version: 0810.4919v2 · doi: 10.48550/arxiv.0810.4919 · pith_short_12: WFTESCPHMTQI · pith_short_16: WFTESCPHMTQIE2BU · pith_short_8: WFTESCPH

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/WFTESCPHMTQIE2BU3KIJVZ5EDV \
  | 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: b1664909e764e0826834da909ae7a41d7b31717cc3436de2eadc02d8be4b1050

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a165c7b8b7dd951f2c60597c1ffd1a033bc42c0bec96617ef3fe175a126e06c1",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-10-27T20:03:24Z",
    "title_canon_sha256": "85a27b2f63eb7ec77f9efcb8eb9bb82fe54ff334955758ee11066e5d9c7af0e4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0810.4919",
    "kind": "arxiv",
    "version": 2
  }
}