Pith Number

pith:P2WRKTJK

pith:2009:P2WRKTJKV7H7G5RKQ7HS6343AX

not attested not anchored not stored refs pending

A surviving disk from a galaxy collision at z=0.4

1), (2) ESO), F. Hammer (1), H. Flores (1), M. Puech (2, M. Rodrigues (1) ((1) GEPI, Observatoire de Paris, Y. Yang (1)

arxiv:0904.1621 v1 · 2009-04-09 · 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{P2WRKTJKV7H7G5RKQ7HS6343AX}

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	2026-05-18T02:14:06.635175Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7ead154d2aafcff3762a87cf2f6f9b05d9c29cb700d39c7be2b7278672306037

Aliases

arxiv: 0904.1621 · arxiv_version: 0904.1621v1 · doi: 10.48550/arxiv.0904.1621 · pith_short_12: P2WRKTJKV7H7 · pith_short_16: P2WRKTJKV7H7G5RK · pith_short_8: P2WRKTJK

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/P2WRKTJKV7H7G5RKQ7HS6343AX \
  | 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: 7ead154d2aafcff3762a87cf2f6f9b05d9c29cb700d39c7be2b7278672306037

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "802367c4af1a5c5253ea4e21613b4249b9b1ba61dce62d140de1068548477199",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-04-09T23:34:58Z",
    "title_canon_sha256": "5e8a3f95c62b9fe358406ca9b3b5a4756541dbce05ab56af71a6f24642e5f4c1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.1621",
    "kind": "arxiv",
    "version": 1
  }
}