Pith Number

pith:2H45ZX4G

pith:2013:2H45ZX4GP54XUZR5PIY7MWUNWW

not attested not anchored not stored refs pending

A joint analysis of the Drake equation and the Fermi paradox

Nikos Prantzos (Institut d'Astrophysique de Paris, Universite P. et M. Curie)

arxiv:1301.6411 v2 · 2013-01-27 · physics.pop-ph · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2H45ZX4GP54XUZR5PIY7MWUNWW}

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.

Cited by

1 paper in Pith

Upper limit on the fraction of alien civilizations that develop communication technology

Receipt and verification

First computed	2026-05-18T01:51:58.103852Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d1f9dcdf867f797a663d7a31f65a8db58cb5bb733e38048f2da6ce995ccfe9ef

Aliases

arxiv: 1301.6411 · arxiv_version: 1301.6411v2 · doi: 10.48550/arxiv.1301.6411 · pith_short_12: 2H45ZX4GP54X · pith_short_16: 2H45ZX4GP54XUZR5 · pith_short_8: 2H45ZX4G

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/2H45ZX4GP54XUZR5PIY7MWUNWW \
  | 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: d1f9dcdf867f797a663d7a31f65a8db58cb5bb733e38048f2da6ce995ccfe9ef

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "df4103e48c2075ad5452338ce040dcb7ea3cc5f062df1f47286069c99fddbeb5",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2013-01-27T23:06:31Z",
    "title_canon_sha256": "fb2f7a100fe2f6eeb4cb6a71b5ec9c0a860178206fbe4ee1dcd0a55952313470"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1301.6411",
    "kind": "arxiv",
    "version": 2
  }
}