Pith Number

pith:5P7UICOF

pith:2015:5P7UICOF3WDZL3BF43BEMQC7HW

not attested not anchored not stored refs pending

Electromagnetic fields with vanishing scalar invariants

Marcello Ortaggio, Vojt\v{e}ch Pravda

arxiv:1506.04538 v2 · 2015-06-15 · gr-qc · hep-th

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{5P7UICOF3WDZL3BF43BEMQC7HW}

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	2026-05-18T01:13:05.059981Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ebff4409c5dd8795ec25e6c246405f3db92f9a48a3810b38b7f5fa48eaddc626

Aliases

arxiv: 1506.04538 · arxiv_version: 1506.04538v2 · doi: 10.48550/arxiv.1506.04538 · pith_short_12: 5P7UICOF3WDZ · pith_short_16: 5P7UICOF3WDZL3BF · pith_short_8: 5P7UICOF

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/5P7UICOF3WDZL3BF43BEMQC7HW \
  | 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: ebff4409c5dd8795ec25e6c246405f3db92f9a48a3810b38b7f5fa48eaddc626

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "82215469cc5410dedd92b67d6524ef053fc4b619cc3578c4802335fe5f5effee",
    "cross_cats_sorted": [
      "hep-th"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2015-06-15T09:59:07Z",
    "title_canon_sha256": "28bea8ba893262d5e0255732bc105e4c368ad7e69c57642d4e826a961067e211"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1506.04538",
    "kind": "arxiv",
    "version": 2
  }
}