Pith Number

pith:QP54QIOE

pith:2013:QP54QIOEKTVJBZNHOA6KX2N2GE

not attested not anchored not stored refs pending

The Heliometer of Rio de Janeiro in Operation - 2013 Calibration

Costantino Sigismondi

arxiv:1307.0548 v1 · 2013-07-01 · astro-ph.IM · astro-ph.SR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QP54QIOEKTVJBZNHOA6KX2N2GE}

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	2026-05-18T03:19:25.325806Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

83fbc821c454ea90e5a7703cabe9ba3113873844dd6aad879f739b833cef50f7

Aliases

arxiv: 1307.0548 · arxiv_version: 1307.0548v1 · doi: 10.48550/arxiv.1307.0548 · pith_short_12: QP54QIOEKTVJ · pith_short_16: QP54QIOEKTVJBZNH · pith_short_8: QP54QIOE

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/QP54QIOEKTVJBZNHOA6KX2N2GE \
  | 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: 83fbc821c454ea90e5a7703cabe9ba3113873844dd6aad879f739b833cef50f7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dd77d865746ef051231d692a9a20a5aa861c18b7bcee4525f6828e0d57673396",
    "cross_cats_sorted": [
      "astro-ph.SR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2013-07-01T21:55:07Z",
    "title_canon_sha256": "59938a3af27117b9688f03f48e868b52df7a5ad6440b34e040591977379fffb2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1307.0548",
    "kind": "arxiv",
    "version": 1
  }
}