Pith Number

pith:7W6N4PDF

pith:2022:7W6N4PDFZNOCOMCUGKVW74UZWD

not attested not anchored not stored refs pending

Figure and Figure Caption Extraction for Mixed Raster and Vector PDFs: Digitization of Astronomical Literature with OCR Features

Alyssa Goodman, J.P. Naiman, Peter K. G. Williams

arxiv:2209.04460 v1 · 2022-09-09 · astro-ph.IM · cs.DL

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7W6N4PDFZNOCOMCUGKVW74UZWD}

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	2026-07-05T04:56:02.223062Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fdbcde3c65cb5c27305432ab6ff299b0f0103318fce268c31e85a06b16da1fc0

Aliases

arxiv: 2209.04460 · arxiv_version: 2209.04460v1 · doi: 10.48550/arxiv.2209.04460 · pith_short_12: 7W6N4PDFZNOC · pith_short_16: 7W6N4PDFZNOCOMCU · pith_short_8: 7W6N4PDF

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/7W6N4PDFZNOCOMCUGKVW74UZWD \
  | 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: fdbcde3c65cb5c27305432ab6ff299b0f0103318fce268c31e85a06b16da1fc0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6adac1754534a35a762131b57bdc13a674e70f9d3cbfdde0429a3871ce6526cd",
    "cross_cats_sorted": [
      "cs.DL"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2022-09-09T18:00:01Z",
    "title_canon_sha256": "2b504f23e750964f67eb6028672635bda32d1f3069594a959f1622bfd17c632a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2209.04460",
    "kind": "arxiv",
    "version": 1
  }
}