Pith Number

pith:CZPUQTR4

pith:2013:CZPUQTR4RDP56EWIEQDR44IOG7

not attested not anchored not stored refs pending

X-ray spectral cut-off and the lack of hard X-ray emission from two ultraluminous X-ray sources M81 X-6 and Holmberg IX X-1

C. D. Ravikumar (University of Calicut), G. C. Dewangan (IUCAA), R. Misra (IUCAA), V. Jithesh (University of Calicut)

arxiv:1304.1889 v1 · 2013-04-06 · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{CZPUQTR4RDP56EWIEQDR44IOG7}

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	2026-05-18T03:16:38.370727Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

165f484e3c88dfdf12c824071e710e37e3117236f9d36a0c92910e582b3ce376

Aliases

arxiv: 1304.1889 · arxiv_version: 1304.1889v1 · doi: 10.48550/arxiv.1304.1889 · pith_short_12: CZPUQTR4RDP5 · pith_short_16: CZPUQTR4RDP56EWI · pith_short_8: CZPUQTR4

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/CZPUQTR4RDP56EWIEQDR44IOG7 \
  | 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: 165f484e3c88dfdf12c824071e710e37e3117236f9d36a0c92910e582b3ce376

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e5276a9b95ed9b479393a9f529d9ddb044ef1f035ac60c6094ad02ec7e1c7f71",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2013-04-06T13:18:28Z",
    "title_canon_sha256": "656a926f4f37c3d1e92400da396d52c339a4dd900ad2fd0cb5d9957992bbfcb0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1304.1889",
    "kind": "arxiv",
    "version": 1
  }
}