Pith Number

pith:42RS3XTK

pith:2017:42RS3XTK3HUAC53ZPA3G4ZTPKC

not attested not anchored not stored refs pending

Easter eggs, myths and jokes in famous physics books and papers

Lorenzo Fortunato

arxiv:1703.10490 v1 · 2017-03-30 · physics.pop-ph · nucl-th · physics.soc-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{42RS3XTK3HUAC53ZPA3G4ZTPKC}

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	2026-05-18T00:47:34.560543Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e6a32dde6ad9e801777978366e666f509a6f414aec836f5f07fe1bfd65745095

Aliases

arxiv: 1703.10490 · arxiv_version: 1703.10490v1 · doi: 10.48550/arxiv.1703.10490 · pith_short_12: 42RS3XTK3HUA · pith_short_16: 42RS3XTK3HUAC53Z · pith_short_8: 42RS3XTK

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/42RS3XTK3HUAC53ZPA3G4ZTPKC \
  | 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: e6a32dde6ad9e801777978366e666f509a6f414aec836f5f07fe1bfd65745095

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1d794eb37847329a305e4d79a11f1a4a2eab2da9ad7d1d1481f68225c30254a3",
    "cross_cats_sorted": [
      "nucl-th",
      "physics.soc-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2017-03-30T14:29:49Z",
    "title_canon_sha256": "8b478e5bf997b4d7edb59c49673f9fea63899d711c20be38f81a05eee8598574"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1703.10490",
    "kind": "arxiv",
    "version": 1
  }
}