Pith Number

pith:HLD4H4CW

pith:1997:HLD4H4CWA7ZDVTYNTBEFZQ3C3D

not attested not anchored not stored refs pending

Astrometric quality of the USNO CCD Astrograph (UCA)

Norbert Zacharias (USRA, USNO, Washington DC)

arxiv:astro-ph/9702206 v1 · 1997-02-24 · 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{HLD4H4CWA7ZDVTYNTBEFZQ3C3D}

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	2026-07-04T16:02:53.626946Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3ac7c3f05607f23acf0d98485cc362d8d2a9c5583f371c48005d2ece5cd2d455

Aliases

arxiv: astro-ph/9702206 · arxiv_version: astro-ph/9702206v1 · doi: 10.48550/arxiv.astro-ph/9702206 · pith_short_12: HLD4H4CWA7ZD · pith_short_16: HLD4H4CWA7ZDVTYN · pith_short_8: HLD4H4CW

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/HLD4H4CWA7ZDVTYNTBEFZQ3C3D \
  | 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: 3ac7c3f05607f23acf0d98485cc362d8d2a9c5583f371c48005d2ece5cd2d455

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "69cb1b424abc28d374eb81d3930614bebf964e3829febdadbd7edca89acb2c22",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1997-02-24T16:00:45Z",
    "title_canon_sha256": "b7def670de94a75259f665aa3b5bdb0a81f55f6bfd4fbd0e87fe8d7421dde3dc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9702206",
    "kind": "arxiv",
    "version": 1
  }
}