Pith Number

pith:WMCR5QD4

pith:2008:WMCR5QD42BN4TU2KMMTXMKGNCT

not attested not anchored not stored refs pending

The Origins and the Early Evolution of Quasars and Supermassive Black Holes

G. Meylan, M. Volonteri, S.G. Djorgovski, V. Bromm, V. Springel

arxiv:0803.2862 v1 · 2008-03-19 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{WMCR5QD42BN4TU2KMMTXMKGNCT}

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	2026-05-18T00:59:32.941967Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b3051ec07cd05bc9d34a63277628cd14fa23ac977dc6b416257604326a17ac11

Aliases

arxiv: 0803.2862 · arxiv_version: 0803.2862v1 · doi: 10.48550/arxiv.0803.2862 · pith_short_12: WMCR5QD42BN4 · pith_short_16: WMCR5QD42BN4TU2K · pith_short_8: WMCR5QD4

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/WMCR5QD42BN4TU2KMMTXMKGNCT \
  | 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: b3051ec07cd05bc9d34a63277628cd14fa23ac977dc6b416257604326a17ac11

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "71facbf0df172458746afe33083219c301a59b18e4a830144baf009805635454",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-03-19T18:58:25Z",
    "title_canon_sha256": "5cf48cba9fd36b990e3000b296de303cce32bbf584eb02bbe75d7e5eec699406"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0803.2862",
    "kind": "arxiv",
    "version": 1
  }
}