Pith Number

pith:MQQX2GDC

pith:2009:MQQX2GDCWY7CX6ZWTSJU6JKV5C

not attested not anchored not stored refs pending

Selection Effects in the SDSS Quasar Sample: The Filter Gap Footprint

M.B. Bell, S.P. Comeau

arxiv:0911.5700 v1 · 2009-11-30 · 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{MQQX2GDCWY7CX6ZWTSJU6JKV5C}

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	2026-05-18T03:35:54.643270Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

64217d1862b63e2bfb369c934f2555e8b0a59ad9836a681b97e219df67351e25

Aliases

arxiv: 0911.5700 · arxiv_version: 0911.5700v1 · doi: 10.48550/arxiv.0911.5700 · pith_short_12: MQQX2GDCWY7C · pith_short_16: MQQX2GDCWY7CX6ZW · pith_short_8: MQQX2GDC

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/MQQX2GDCWY7CX6ZWTSJU6JKV5C \
  | 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: 64217d1862b63e2bfb369c934f2555e8b0a59ad9836a681b97e219df67351e25

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3370a4c68e995f64be11ecac9729dfde463d933d519d63b40d80350b489f34ab",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-11-30T20:36:00Z",
    "title_canon_sha256": "6f0f2b18adb50917404286e723b6e4a47f71d5e2e1ba8ebc286eaa424a3fa4d5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0911.5700",
    "kind": "arxiv",
    "version": 1
  }
}