Pith Number

pith:HHEPPQ25

pith:2011:HHEPPQ25JMBJXGADVDWWNVYNXY

not attested not anchored not stored refs pending

BL Lacertae Objects and the Extragalactic Gamma-Ray Background

Fan Li, Xinwu Cao

arxiv:1103.4545 v1 · 2011-03-23 · 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{HHEPPQ25JMBJXGADVDWWNVYNXY}

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	2026-05-18T02:02:47.760944Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

39c8f7c35d4b029b9803a8ed66d70dbe02ec7d98d961eb23006aea97db3d5c21

Aliases

arxiv: 1103.4545 · arxiv_version: 1103.4545v1 · doi: 10.48550/arxiv.1103.4545 · pith_short_12: HHEPPQ25JMBJ · pith_short_16: HHEPPQ25JMBJXGAD · pith_short_8: HHEPPQ25

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/HHEPPQ25JMBJXGADVDWWNVYNXY \
  | 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: 39c8f7c35d4b029b9803a8ed66d70dbe02ec7d98d961eb23006aea97db3d5c21

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "89cf19f25ddc13a7210bbe202bd8a8d18a21dc218b04f35660010fab166713d0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2011-03-23T15:07:08Z",
    "title_canon_sha256": "94f64e730c63429d491a698250f7118d2e6006fa3bc34aeeea1210a14bd23d0d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1103.4545",
    "kind": "arxiv",
    "version": 1
  }
}