Pith Number

pith:76YM7R2C

pith:2009:76YM7R2CETQ6ZBYIVMPVFUNARG

not attested not anchored not stored refs pending

Massive Black Holes Across Cosmic Time

A. Loeb (Harvard), B. Schutz (AEI, Cambridge), D. Richstone (U of Michigan), E. Phinney (Caltech), J. Primack (UCSC), K. Thorne (Caltech), M. Rees (IoA, M. Volonteri (U of Michigan), P. Bender (U of Colorado), P. Madau (UCSC), Potsdam), S. Hughes (MIT), T. Abel (Stanford), T. Di Matteo (CMU), T. Prince (Caltech), Z. Haiman (Columbia)

arxiv:0903.0097 v1 · 2009-02-28 · astro-ph.CO · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{76YM7R2CETQ6ZBYIVMPVFUNARG}

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	2026-07-04T15:38:54.457136Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ffb0cfc74224e1ec8708ab1f52d1a08983f2fa9739d690ca050240850199afad

Aliases

arxiv: 0903.0097 · arxiv_version: 0903.0097v1 · doi: 10.48550/arxiv.0903.0097 · pith_short_12: 76YM7R2CETQ6 · pith_short_16: 76YM7R2CETQ6ZBYI · pith_short_8: 76YM7R2C

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/76YM7R2CETQ6ZBYIVMPVFUNARG \
  | 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: ffb0cfc74224e1ec8708ab1f52d1a08983f2fa9739d690ca050240850199afad

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ecb5f9fec0d600d6e0154a981ec8b7d5347c23ae559bc8105b550e17d2698a6d",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-02-28T19:29:36Z",
    "title_canon_sha256": "689546a484d8edca46938465df89d8ba4b782413dd9184e98d0edf452b99d6b5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.0097",
    "kind": "arxiv",
    "version": 1
  }
}