Pith Number

pith:QDNSKMWY

pith:2009:QDNSKMWYAVITYRKBZ7EDXERDQ7

not attested not anchored not stored refs pending

Optical Spectroscopy of Bright Fermi LAT Blazars

Anthony C. S. Readhead, Garret Cotter, Michael S. Shaw, Peter F. Michelson, Roger W. Romani, Stephen E. Healey

arxiv:0908.2996 v1 · 2009-08-20 · astro-ph.HE · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QDNSKMWYAVITYRKBZ7EDXERDQ7}

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	2026-05-18T02:12:24.615244Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

80db2532d805513c4541cfc83b922387f306655e0ca5425b46f77cd8a79b4379

Aliases

arxiv: 0908.2996 · arxiv_version: 0908.2996v1 · doi: 10.48550/arxiv.0908.2996 · pith_short_12: QDNSKMWYAVIT · pith_short_16: QDNSKMWYAVITYRKB · pith_short_8: QDNSKMWY

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/QDNSKMWYAVITYRKBZ7EDXERDQ7 \
  | 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: 80db2532d805513c4541cfc83b922387f306655e0ca5425b46f77cd8a79b4379

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fba48798f481250230ca64005f60bd66dda978a8924433410f8441769133b46c",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2009-08-20T20:02:04Z",
    "title_canon_sha256": "105b53f3d2e053cb8e3c77e3ce40cbe9945cfe1c6607eee076c351dc5ec91a83"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0908.2996",
    "kind": "arxiv",
    "version": 1
  }
}