Pith Number

pith:X6HWMZEZ

pith:2009:X6HWMZEZQAUNXAD6KIS2FQ4BOM

not attested not anchored not stored refs pending

Spitzer observations of a gravitationally lensed quasar, QSO 2237+0305

Amy Kimball (UW), Eric Agol (UW), Stephanie Gogarten (UW), Varoujan Gorjian (JPL)

arxiv:0905.1177 v1 · 2009-05-08 · 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{X6HWMZEZQAUNXAD6KIS2FQ4BOM}

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	2026-05-18T04:29:43.116127Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bf8f6664998028db807e5225a2c38173185d0e25b208bc8a65636606cca00a4f

Aliases

arxiv: 0905.1177 · arxiv_version: 0905.1177v1 · doi: 10.48550/arxiv.0905.1177 · pith_short_12: X6HWMZEZQAUN · pith_short_16: X6HWMZEZQAUNXAD6 · pith_short_8: X6HWMZEZ

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/X6HWMZEZQAUNXAD6KIS2FQ4BOM \
  | 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: bf8f6664998028db807e5225a2c38173185d0e25b208bc8a65636606cca00a4f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "668a33bcf68e6a645567ee4bd65f9e5dce058932c7ce0f4c70e2b0a6ee276053",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-05-08T05:46:39Z",
    "title_canon_sha256": "b8e5cf29cec0ec7bd5298c8da4288fb9371eb35bfa943c89e6a3377a955d165c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.1177",
    "kind": "arxiv",
    "version": 1
  }
}