Pith Number

pith:UG4OJX2U

pith:2025:UG4OJX2UKNXJT7BUGZW5IHXDYY

not attested not anchored not stored refs pending

Probing spectral variability in NGC 4490 ULX-8 over 24 years of XMM-Newton, Chandra and Swift-XRT observations

Aman Upadhyay, Aru Beri, Tanuman Ghosh, Tarang Vashisht, Vikram Rana

arxiv:2510.11415 v3 · 2025-10-13 · 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{UG4OJX2UKNXJT7BUGZW5IHXDYY}

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	2026-05-25T02:01:08.197732Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a1b8e4df54536e99fc34366dd41ee3c631624ee5b99134bfaf2063946d6c52b1

Aliases

arxiv: 2510.11415 · arxiv_version: 2510.11415v3 · doi: 10.48550/arxiv.2510.11415 · pith_short_12: UG4OJX2UKNXJ · pith_short_16: UG4OJX2UKNXJT7BU · pith_short_8: UG4OJX2U

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/UG4OJX2UKNXJT7BUGZW5IHXDYY \
  | 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: a1b8e4df54536e99fc34366dd41ee3c631624ee5b99134bfaf2063946d6c52b1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "adb2e8f451e421203fc5c5a25253ba25fe46ec3fb2d4e83c522fe7fd7856a300",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2025-10-13T13:53:24Z",
    "title_canon_sha256": "5b170550b7a471da9effac1f080289d84e4291fa071d00836f54400efcffca26"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2510.11415",
    "kind": "arxiv",
    "version": 3
  }
}