Pith Number

pith:7L2ERAON

pith:2008:7L2ERAON2GFWGL4DPO2O7BILFP

not attested not anchored not stored refs pending

Is the Optically Unidentified Radio Source, FIRST J121839.7+295325, a Dark Lens?

C. R. Keeton, R. A. Windhorst, R. E. Ryan Jr., S. H. Cohen, T. J. Veach

arxiv:0806.3781 v2 · 2008-06-23 · 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{7L2ERAON2GFWGL4DPO2O7BILFP}

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	2026-07-04T17:11:23.703846Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

faf44881cdd18b632f837bb4ef850b2be2bc04e63dda14554f20aeb70a525753

Aliases

arxiv: 0806.3781 · arxiv_version: 0806.3781v2 · doi: 10.48550/arxiv.0806.3781 · pith_short_12: 7L2ERAON2GFW · pith_short_16: 7L2ERAON2GFWGL4D · pith_short_8: 7L2ERAON

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/7L2ERAON2GFWGL4DPO2O7BILFP \
  | 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: faf44881cdd18b632f837bb4ef850b2be2bc04e63dda14554f20aeb70a525753

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "89d8289b447e05b9d6a94ccb8c114a0e5685a1ac588f3046ceb85e10f0beb1b6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-06-23T21:48:46Z",
    "title_canon_sha256": "923fa3fcaa6ee9a13a0fa03099281f6100502e8b73b6629126fd6f32518e0e39"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0806.3781",
    "kind": "arxiv",
    "version": 2
  }
}