Pith Number

pith:664RNI75

pith:2021:664RNI75BUQACLWQCE6ZNLWHKB

not attested not anchored not stored refs pending

Expecting the unexpected in the search for extraterrestrial life

Peter Vickers

arxiv:2105.09055 v1 · 2021-05-19 · astro-ph.IM · physics.hist-ph · physics.space-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{664RNI75BUQACLWQCE6ZNLWHKB}

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	2026-07-05T06:22:55.875923Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f7b916a3fd0d20012ed0113d96aec7506be3af3f6c39d851b74469553ff7357a

Aliases

arxiv: 2105.09055 · arxiv_version: 2105.09055v1 · doi: 10.48550/arxiv.2105.09055 · pith_short_12: 664RNI75BUQA · pith_short_16: 664RNI75BUQACLWQ · pith_short_8: 664RNI75

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/664RNI75BUQACLWQCE6ZNLWHKB \
  | 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: f7b916a3fd0d20012ed0113d96aec7506be3af3f6c39d851b74469553ff7357a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a635722e39a8c7d3c55e7a2e0386fcf203d2b361958c886dd0e4718bcc42b068",
    "cross_cats_sorted": [
      "physics.hist-ph",
      "physics.space-ph"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2021-05-19T10:46:19Z",
    "title_canon_sha256": "ad81c69437ccfbc48e349acd57f4a1fd6bb48c414865cdc9c5656eb43309d9cc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2105.09055",
    "kind": "arxiv",
    "version": 1
  }
}