Pith Number

pith:BC7OM3DD

pith:1997:BC7OM3DDAB6CPKESRCJLIPBBQC

not attested not anchored not stored refs pending

The External Shear Acting on Gravitational Lens B 1422+231

David W. Hogg, James E. Larkin (Univ. of Chicago), Judith G. Cohen (Caltech), Lori M. Lubin (OCIW), Roger D. Blandford, Tomislav Kundic

arxiv:astro-ph/9706169 v1 · 1997-06-17 · 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{BC7OM3DDAB6CPKESRCJLIPBBQC}

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	2026-07-04T16:03:04.194584Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

08bee66c63007c27a8928892b43c2180b2de9519e23ce05152ade57878a16e94

Aliases

arxiv: astro-ph/9706169 · arxiv_version: astro-ph/9706169v1 · doi: 10.48550/arxiv.astro-ph/9706169 · pith_short_12: BC7OM3DDAB6C · pith_short_16: BC7OM3DDAB6CPKES · pith_short_8: BC7OM3DD

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/BC7OM3DDAB6CPKESRCJLIPBBQC \
  | 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: 08bee66c63007c27a8928892b43c2180b2de9519e23ce05152ade57878a16e94

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "01bfea5b42f033aa43e1b9107bed804e9ee869cb7ef7bf6720bf36df1197e63d",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1997-06-17T00:23:00Z",
    "title_canon_sha256": "28616956f7d3637f4a7da0aa39b67f0a82efb070bdcdf284c227054214ebac1e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9706169",
    "kind": "arxiv",
    "version": 1
  }
}