Pith Number

pith:N2P4U7XW

pith:2009:N2P4U7XWS2WSE55SXKCY43XMTS

not attested not anchored not stored refs pending

Downsizing of supermassive black holes from the SDSS quasar survey

Aldo Treves, Marzia Labita, Renato Falomo, Roberto Decarli

arxiv:0903.4136 v1 · 2009-03-24 · 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{N2P4U7XWS2WSE55SXKCY43XMTS}

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	2026-05-18T02:14:26.202836Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6e9fca7ef696ad2277b2ba858e6eec9c91844e05c0f056740d2ab7568d9fcaa9

Aliases

arxiv: 0903.4136 · arxiv_version: 0903.4136v1 · doi: 10.48550/arxiv.0903.4136 · pith_short_12: N2P4U7XWS2WS · pith_short_16: N2P4U7XWS2WSE55S · pith_short_8: N2P4U7XW

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/N2P4U7XWS2WSE55SXKCY43XMTS \
  | 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: 6e9fca7ef696ad2277b2ba858e6eec9c91844e05c0f056740d2ab7568d9fcaa9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fa5f53971ad6d61f98655bf90216733ee3d50c7f3af820d0fa011bc61ba6f5b1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-03-24T17:06:33Z",
    "title_canon_sha256": "757041954b29077f84f96731916bb070bfeb3ed9899dee47a4efcccbfdd07006"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.4136",
    "kind": "arxiv",
    "version": 1
  }
}