Pith Number

pith:K4SNQSGE

pith:2009:K4SNQSGEXHID5JYICXG4TO7AHN

not attested not anchored not stored refs pending

Groups of Galaxies in AEGIS: The 200 ksec Chandra Extended X-ray Source catalogue

Alison L. Coil, Brian F. Gerke, Christopher N. A. Willmer, Elise S. Laird, Jeffrey A. Newman, Kirpal Nandra, Marc Davis, Michael C. Cooper, Tesla E. Jeltema

arxiv:0907.1903 v1 · 2009-07-10 · 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{K4SNQSGEXHID5JYICXG4TO7AHN}

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	2026-05-18T02:13:03.862362Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5724d848c4b9d03ea70815cdc9bbe03b73f2a4106e4787353f734cbe58b7dc50

Aliases

arxiv: 0907.1903 · arxiv_version: 0907.1903v1 · doi: 10.48550/arxiv.0907.1903 · pith_short_12: K4SNQSGEXHID · pith_short_16: K4SNQSGEXHID5JYI · pith_short_8: K4SNQSGE

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/K4SNQSGEXHID5JYICXG4TO7AHN \
  | 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: 5724d848c4b9d03ea70815cdc9bbe03b73f2a4106e4787353f734cbe58b7dc50

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "194e8e5df4a25f621932c59199914508dcc828dc199a6c4964ccd7b4aff315a1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-07-10T20:19:31Z",
    "title_canon_sha256": "9e441c589c94362558261d1f041a9bf8e09259a12c20e005503dc15a4b38888e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.1903",
    "kind": "arxiv",
    "version": 1
  }
}