Pith Number

pith:VVO4L7S6

pith:2011:VVO4L7S6ZQH7WZZDPDD4OCFGEM

not attested not anchored not stored refs pending

Introduction to pinhole astronomy

Costantino Sigismondi

arxiv:1107.0820 v1 · 2011-07-05 · astro-ph.IM · physics.ed-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{VVO4L7S6ZQH7WZZDPDD4OCFGEM}

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	2026-05-18T04:18:52.628594Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ad5dc5fe5ecc0ffb672378c7c708a6230d92d0f58185e694ba104fda74da1098

Aliases

arxiv: 1107.0820 · arxiv_version: 1107.0820v1 · doi: 10.48550/arxiv.1107.0820 · pith_short_12: VVO4L7S6ZQH7 · pith_short_16: VVO4L7S6ZQH7WZZD · pith_short_8: VVO4L7S6

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/VVO4L7S6ZQH7WZZDPDD4OCFGEM \
  | 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: ad5dc5fe5ecc0ffb672378c7c708a6230d92d0f58185e694ba104fda74da1098

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "760fa772898016d10015e2fde68c4e96ada3fd3bce5a48f81ce50c5e51420353",
    "cross_cats_sorted": [
      "physics.ed-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2011-07-05T09:09:27Z",
    "title_canon_sha256": "10c6f557245d5427f561f06b33e01f38b06c73c3e34a6968dd5df125f3787a10"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1107.0820",
    "kind": "arxiv",
    "version": 1
  }
}