Pith Number

pith:EHWDLJF4

pith:2006:EHWDLJF4YZ7VD5GADRZWXMID6W

not attested not anchored not stored refs pending

X-ray and optical variability of the ultraluminous X-ray source NGC 1313 X-2

2), (2) INAF-Astronomical Observatory of Padova, (3) Department of Physics, (4) Department of Physics, A. Treves (3), L. Zampieri (2), Mathematics, P. Mucciarelli (1, R. Falomo (2) ((1) Department of Astronomy, R. Turolla (4), University of Insubria, University of Padova, University of Padova)

arxiv:astro-ph/0612420 v1 · 2006-12-15 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EHWDLJF4YZ7VD5GADRZWXMID6W}

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	2026-05-18T01:40:28.443888Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

21ec35a4bcc67f51f4c01c736bb103f5accd9f4e646700ce33782a6c7182a116

Aliases

arxiv: astro-ph/0612420 · arxiv_version: astro-ph/0612420v1 · doi: 10.48550/arxiv.astro-ph/0612420 · pith_short_12: EHWDLJF4YZ7V · pith_short_16: EHWDLJF4YZ7VD5GA · pith_short_8: EHWDLJF4

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/EHWDLJF4YZ7VD5GADRZWXMID6W \
  | 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: 21ec35a4bcc67f51f4c01c736bb103f5accd9f4e646700ce33782a6c7182a116

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dda99520cd70e002a977d524a7d5a86e79b70f9eaa4679b9a4088b0273b3fcd2",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2006-12-15T10:20:44Z",
    "title_canon_sha256": "7761402120c8d50107465d8679d1a699ca2dde4a33becd24b9ceea9c42aa662d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0612420",
    "kind": "arxiv",
    "version": 1
  }
}