Pith Number

pith:NVP6MEKN

pith:2008:NVP6MEKNA4XQFBIEN2DSUPGW7R

not attested not anchored not stored refs pending

The Mass of the Black Hole in the Quasar PG 2130+099

B. M. Peterson, C. J. Grier, D. L. DePoy, D. W. Atlee, J. Bird, J. C. Yee, J. D. Eastman, J. L. Prieto, K. D. Denney, L. C. Watson, M. C. Bentz, M. Dietrich, M. E. Eyler, M. S. Peeples, R. J. Assef, R. Siverd, R. W. Pogge

arxiv:0808.0507 v1 · 2008-08-04 · 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{NVP6MEKNA4XQFBIEN2DSUPGW7R}

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	2026-05-18T04:07:41.007763Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6d5fe6114d072f0285046e872a3cd6fc500e44c000d9342bd085f4fa93a16e8d

Aliases

arxiv: 0808.0507 · arxiv_version: 0808.0507v1 · doi: 10.48550/arxiv.0808.0507 · pith_short_12: NVP6MEKNA4XQ · pith_short_16: NVP6MEKNA4XQFBIE · pith_short_8: NVP6MEKN

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/NVP6MEKNA4XQFBIEN2DSUPGW7R \
  | 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: 6d5fe6114d072f0285046e872a3cd6fc500e44c000d9342bd085f4fa93a16e8d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "86127cb4fdf597b5ae826d4ed9341716a12c2ad2bbb9b6aa17c72213ec655e4a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-08-04T20:15:49Z",
    "title_canon_sha256": "ccdada951fdf4a1704882f18e9ed2f867f45b3e113adb0495683081d3962486f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0808.0507",
    "kind": "arxiv",
    "version": 1
  }
}