Pith Number

pith:U5YURAQF

pith:2009:U5YURAQFDIYTHH73ECXWSBCDCM

not attested not anchored not stored refs pending

Early Fermi Gamma-ray Space Telescope Observations of the Quasar 3C 454.3

et al, Fermi/LAT Collaboration: A. A. Abdo

arxiv:0904.4280 v1 · 2009-04-27 · 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{U5YURAQFDIYTHH73ECXWSBCDCM}

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	2026-05-18T03:48:02.669842Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a7714882051a31339ffb20af6904431332220e803aa934505cbadf5b256a651f

Aliases

arxiv: 0904.4280 · arxiv_version: 0904.4280v1 · doi: 10.48550/arxiv.0904.4280 · pith_short_12: U5YURAQFDIYT · pith_short_16: U5YURAQFDIYTHH73 · pith_short_8: U5YURAQF

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/U5YURAQFDIYTHH73ECXWSBCDCM \
  | 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: a7714882051a31339ffb20af6904431332220e803aa934505cbadf5b256a651f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0ec918d1526e1e92b209db617f587172a6f6a84a85ca0cfe33755e310251cffe",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2009-04-27T23:23:58Z",
    "title_canon_sha256": "e778695916ae8ba4afa97c60769b0f4dcced18d37fbcefe0224b5456ee2ff122"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.4280",
    "kind": "arxiv",
    "version": 1
  }
}