Pith Number

pith:6CIUNHTW

pith:2019:6CIUNHTW2YNRLSD4JIAGKDFNUT

not attested not anchored not stored refs pending

Quasars Have Fewer Close Companions than Normal Galaxies

Ian D. McGreer, Jan-Torge Schindler, Minghao Yue, Xiaohui Fan, Yun-Hsin Huang

arxiv:1909.00967 v1 · 2019-09-03 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{6CIUNHTW2YNRLSD4JIAGKDFNUT}

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	2026-07-05T00:10:43.069553Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f091469e76d61b15c87c4a00650cada4fe52d7bfff45b979612071ddf7b623fa

Aliases

arxiv: 1909.00967 · arxiv_version: 1909.00967v1 · doi: 10.48550/arxiv.1909.00967 · pith_short_12: 6CIUNHTW2YNR · pith_short_16: 6CIUNHTW2YNRLSD4 · pith_short_8: 6CIUNHTW

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/6CIUNHTW2YNRLSD4JIAGKDFNUT \
  | 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: f091469e76d61b15c87c4a00650cada4fe52d7bfff45b979612071ddf7b623fa

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bcf3a20700d0ecb16cba323faadd745a479c551581805d5164a64d4279834a15",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2019-09-03T06:16:08Z",
    "title_canon_sha256": "51ac1fb6e08c1949f1dcb98f011e01a43d2b96ae2e225682e257c7200776aa04"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1909.00967",
    "kind": "arxiv",
    "version": 1
  }
}