Pith Number

pith:WW3WAGTV

pith:2002:WW3WAGTVDK47DFVDX4WMEU6PLL

not attested not anchored not stored refs pending

Notch Filter Masks: Practical Image Masks for Planet-Finding Coronagraphs

David N. Spergel, Marc J. Kuchner

arxiv:astro-ph/0209271 v2 · 2002-09-13 · 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{WW3WAGTVDK47DFVDX4WMEU6PLL}

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	2026-05-18T01:07:44.514521Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b5b7601a751ab9f196a3bf2cc253cf5ac822c5d219517986cfe550bcf5fe1539

Aliases

arxiv: astro-ph/0209271 · arxiv_version: astro-ph/0209271v2 · doi: 10.48550/arxiv.astro-ph/0209271 · pith_short_12: WW3WAGTVDK47 · pith_short_16: WW3WAGTVDK47DFVD · pith_short_8: WW3WAGTV

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/WW3WAGTVDK47DFVDX4WMEU6PLL \
  | 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: b5b7601a751ab9f196a3bf2cc253cf5ac822c5d219517986cfe550bcf5fe1539

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "77f637e07c903f330f8a5598744e3330567a6de880256673af809b0d98d3bec5",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2002-09-13T18:30:20Z",
    "title_canon_sha256": "768fa5ce277d4b32b7f583737a5affeef8e1641fd7b829402c48984de36be724"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0209271",
    "kind": "arxiv",
    "version": 2
  }
}