Pith Number

pith:TZNRNFUP

pith:2015:TZNRNFUPPX2EBZEFKCAR4JZSWG

not attested not anchored not stored refs pending

A New Empirical Constraint on the Prevalence of Technological Species in the Universe

Adam Frank, W.T. Sullivan III

arxiv:1510.08837 v1 · 2015-10-19 · astro-ph.EP · 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{TZNRNFUPPX2EBZEFKCAR4JZSWG}

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	2026-05-18T01:13:16.413196Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9e5b16968f7df440e48550811e2732b1ab5066bfcf91e83279578efc684e48c5

Aliases

arxiv: 1510.08837 · arxiv_version: 1510.08837v1 · doi: 10.48550/arxiv.1510.08837 · pith_short_12: TZNRNFUPPX2E · pith_short_16: TZNRNFUPPX2EBZEF · pith_short_8: TZNRNFUP

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/TZNRNFUPPX2EBZEFKCAR4JZSWG \
  | 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: 9e5b16968f7df440e48550811e2732b1ab5066bfcf91e83279578efc684e48c5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "636bde2602ea7eecbe458f3cd5236485893cad108f126cff9895f70c7a4377cf",
    "cross_cats_sorted": [
      "physics.pop-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2015-10-19T14:30:01Z",
    "title_canon_sha256": "3066477e22563a2ddf2434c2f34c689d2c3ceaa5e619f531d7a2d98972746dc4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1510.08837",
    "kind": "arxiv",
    "version": 1
  }
}