Pith Number

pith:75SYLERR

pith:2010:75SYLERRKFOU5KK2QPKADNKUUS

not attested not anchored not stored refs pending

Ernst Mayr and Carl Sagan debate about the probability of intelligent life in the universe

Carl Sagan, Ernst Mayr, Guillermo A. Lemarchand

arxiv:1012.2591 v1 · 2010-12-12 · physics.pop-ph · physics.hist-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{75SYLERRKFOU5KK2QPKADNKUUS}

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	2026-05-18T04:33:28.246455Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ff65859231515d4ea95a83d401b554a49a25170d2251454e0959228c944326f0

Aliases

arxiv: 1012.2591 · arxiv_version: 1012.2591v1 · doi: 10.48550/arxiv.1012.2591 · pith_short_12: 75SYLERRKFOU · pith_short_16: 75SYLERRKFOU5KK2 · pith_short_8: 75SYLERR

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/75SYLERRKFOU5KK2QPKADNKUUS \
  | 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: ff65859231515d4ea95a83d401b554a49a25170d2251454e0959228c944326f0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "66c5bc6a303fd972dbe9944fc2d90dc7e8102e791432e3bb8a3e856fc543eb40",
    "cross_cats_sorted": [
      "physics.hist-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2010-12-12T21:21:56Z",
    "title_canon_sha256": "5924133cbdf0bb3199701a588e97860e700748868899a4e3029a77a79f7c29ad"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1012.2591",
    "kind": "arxiv",
    "version": 1
  }
}