Pith Number

pith:VZ67DAVZ

pith:2016:VZ67DAVZIHRAEIS6FCAHMYGD3G

not attested not anchored not stored refs pending

Kardashev's Classification at 50+: A Fine Vehicle with Room for Improvement

Milan M. Cirkovic

arxiv:1601.05112 v1 · 2016-01-07 · astro-ph.EP · 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{VZ67DAVZIHRAEIS6FCAHMYGD3G}

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	2026-05-18T01:22:16.137758Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ae7df182b941e202225e28807660c3d9973cf6abb22f88dd80c048bf9802c872

Aliases

arxiv: 1601.05112 · arxiv_version: 1601.05112v1 · doi: 10.48550/arxiv.1601.05112 · pith_short_12: VZ67DAVZIHRA · pith_short_16: VZ67DAVZIHRAEIS6 · pith_short_8: VZ67DAVZ

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/VZ67DAVZIHRAEIS6FCAHMYGD3G \
  | 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: ae7df182b941e202225e28807660c3d9973cf6abb22f88dd80c048bf9802c872

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "09eba5ce01807e7cdf475ed6146d51d2e3feafce8a7c6ed984c81cb8a00712a7",
    "cross_cats_sorted": [
      "physics.hist-ph",
      "physics.pop-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2016-01-07T21:09:52Z",
    "title_canon_sha256": "907823fe1c6f9752c61b93a6a8e1c9699fb56de011db04560c5646675f5400aa"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1601.05112",
    "kind": "arxiv",
    "version": 1
  }
}