Pith Number

pith:MJF22CTR

pith:2015:MJF22CTR4NJEWXOVDXCAPKKL63

not attested not anchored not stored refs pending

Early Telescopes and Ancient Scientific Instruments in the Paintings of Jan Brueghel the Elder

Italy), Osservatorio Astronomico di Trieste, Paolo Molaro (INAF, Pierluigi Selvelli

arxiv:1512.01347 v1 · 2015-12-04 · astro-ph.IM · physics.hist-ph · physics.pop-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{MJF22CTR4NJEWXOVDXCAPKKL63}

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	2026-05-18T01:25:17.220775Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

624bad0a71e3524b5dd51dc407a94bf6d68f880d2c60b30263016d81c2eec539

Aliases

arxiv: 1512.01347 · arxiv_version: 1512.01347v1 · doi: 10.48550/arxiv.1512.01347 · pith_short_12: MJF22CTR4NJE · pith_short_16: MJF22CTR4NJEWXOV · pith_short_8: MJF22CTR

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/MJF22CTR4NJEWXOVDXCAPKKL63 \
  | 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: 624bad0a71e3524b5dd51dc407a94bf6d68f880d2c60b30263016d81c2eec539

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dac938c7be97d4461fed0ca3be15ffa6b6ae8b2d4ccc27e343f2a2b365e47742",
    "cross_cats_sorted": [
      "physics.hist-ph",
      "physics.pop-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2015-12-04T09:24:54Z",
    "title_canon_sha256": "8b9caa1e5e456a9568b36be341f52a8939b29dae348a50952afb77788d46e35f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1512.01347",
    "kind": "arxiv",
    "version": 1
  }
}