Pith Number

pith:75SIBUGC

pith:1999:75SIBUGCJ3WHH27KBMTVRQS36J

not attested not anchored not stored refs pending

Extragalactic background light absorption signal in the 0.26-10 TeV spectra of blazars

Vladimir V. Vassiliev

arxiv:astro-ph/9911018 v1 · 1999-11-02 · 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{75SIBUGCJ3WHH27KBMTVRQS36J}

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	2026-07-04T16:11:46.089400Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ff6480d0c24eec73ebea0b2758c25bf2424a267f13ddaa5124d3be13eb1c3c52

Aliases

arxiv: astro-ph/9911018 · arxiv_version: astro-ph/9911018v1 · doi: 10.48550/arxiv.astro-ph/9911018 · pith_short_12: 75SIBUGCJ3WH · pith_short_16: 75SIBUGCJ3WHH27K · pith_short_8: 75SIBUGC

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/75SIBUGCJ3WHH27KBMTVRQS36J \
  | 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: ff6480d0c24eec73ebea0b2758c25bf2424a267f13ddaa5124d3be13eb1c3c52

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4b4a4fb0d13f83f3a27ce373a1b704a9e8c3b5e673b4362ea9102b0d536c516c",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-11-02T18:01:32Z",
    "title_canon_sha256": "30a19b912d6575a70d7461b8e3e634efbff4ae7538272ced7f846fc6f4e4c7dd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9911018",
    "kind": "arxiv",
    "version": 1
  }
}