Pith Number

pith:2P5MFRK4

pith:2018:2P5MFRK4OUG6ENS5S4FZA6JBCA

not attested not anchored not stored refs pending

The Silurian Hypothesis: Would it be possible to detect an industrial civilization in the geological record?

Adam Frank, Gavin A. Schmidt

arxiv:1804.03748 v1 · 2018-04-10 · astro-ph.EP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2P5MFRK4OUG6ENS5S4FZA6JBCA}

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	2026-05-17T23:47:31.242875Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d3fac2c55c750de2365d970b9079211017e711b39fdf07c5aacd0a6ca1c519ef

Aliases

arxiv: 1804.03748 · arxiv_version: 1804.03748v1 · doi: 10.48550/arxiv.1804.03748 · pith_short_12: 2P5MFRK4OUG6 · pith_short_16: 2P5MFRK4OUG6ENS5 · pith_short_8: 2P5MFRK4

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/2P5MFRK4OUG6ENS5S4FZA6JBCA \
  | 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: d3fac2c55c750de2365d970b9079211017e711b39fdf07c5aacd0a6ca1c519ef

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "427710a32109470d28554c4dab3468555a68038212e8c1da9c83ab2cb1bcbfc1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2018-04-10T23:26:11Z",
    "title_canon_sha256": "aeafd1ad4bf3cfc101e52d042ab6d9564134f57a63f170a2d8df59abf8e72ced"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.03748",
    "kind": "arxiv",
    "version": 1
  }
}