Pith Number

pith:HP3LK6AE

pith:2004:HP3LK6AEHN2PFW2FT4XYIRJ4M5

not attested not anchored not stored refs pending

Keck spectroscopy of CLASS gravitational lenses

2), (2) UC Davis, (3) Caltech, 4), (4) STSCI, (5) KIPAC), A.C.S. Readhead (3) ((1) JBO, C.D. Fassnacht (2), I.W.A. Browne (1), J.P McKean (1, L.M. Lubin (2), L.V.E. Koopmans (3, R.D. Blandford (5)

arxiv:astro-ph/0402116 v1 · 2004-02-04 · 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{HP3LK6AEHN2PFW2FT4XYIRJ4M5}

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	2026-07-04T16:42:58.548074Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3bf6b578043b74f2db459f2f84453c674cf22af4ba5671a47ab17f324daa8ab6

Aliases

arxiv: astro-ph/0402116 · arxiv_version: astro-ph/0402116v1 · doi: 10.48550/arxiv.astro-ph/0402116 · pith_short_12: HP3LK6AEHN2P · pith_short_16: HP3LK6AEHN2PFW2F · pith_short_8: HP3LK6AE

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/HP3LK6AEHN2PFW2FT4XYIRJ4M5 \
  | 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: 3bf6b578043b74f2db459f2f84453c674cf22af4ba5671a47ab17f324daa8ab6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a89f5a0ffa0e50730c1f07141ec8cd574b013434b510784160521bcc7dfb496a",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-02-04T22:23:04Z",
    "title_canon_sha256": "18c0256139f63490b2e9779495cb6de46d761760f2aeeec594bffff2e1a4cf27"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0402116",
    "kind": "arxiv",
    "version": 1
  }
}