Pith Number

pith:RGLBJJIG

pith:2008:RGLBJJIGCHIJ7CHYQVUL2QXKSJ

not attested not anchored not stored refs pending

Double quasars: probes of black hole scaling relationships and merger scenarios

Gary Foreman, Marta Volonteri, Massimo Dotti

arxiv:0812.1569 v1 · 2008-12-08 · 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{RGLBJJIGCHIJ7CHYQVUL2QXKSJ}

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	2026-05-18T04:29:24.689840Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

899614a50611d09f88f88568bd42ea92586f8ed904b074c85ac6698d79b67f17

Aliases

arxiv: 0812.1569 · arxiv_version: 0812.1569v1 · doi: 10.48550/arxiv.0812.1569 · pith_short_12: RGLBJJIGCHIJ · pith_short_16: RGLBJJIGCHIJ7CHY · pith_short_8: RGLBJJIG

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/RGLBJJIGCHIJ7CHYQVUL2QXKSJ \
  | 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: 899614a50611d09f88f88568bd42ea92586f8ed904b074c85ac6698d79b67f17

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e2b60579f4ff90fb115834a0f965df4b1a9f40afbb7c04fe23837d1e64dcf389",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-12-08T21:11:18Z",
    "title_canon_sha256": "2dd0054cf86c1a5ad20336722d0781228724e698315843e9f9bf87aa1111f10f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0812.1569",
    "kind": "arxiv",
    "version": 1
  }
}