Pith Number

pith:WYXBAHOC

pith:2019:WYXBAHOCFKCLG6SSZQJPEG2GPO

not attested not anchored not stored refs pending

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

Luis A. Anchordoqui, Susanna M. Weber

arxiv:1908.01335 v1 · 2019-08-04 · 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{WYXBAHOCFKCLG6SSZQJPEG2GPO}

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	2026-07-04T23:51:29.223611Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b62e101dc22a84b37a52cc12f21b467b89762b9fe1e011aa491deff7d5a8a739

Aliases

arxiv: 1908.01335 · arxiv_version: 1908.01335v1 · doi: 10.48550/arxiv.1908.01335 · pith_short_12: WYXBAHOCFKCL · pith_short_16: WYXBAHOCFKCLG6SS · pith_short_8: WYXBAHOC

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/WYXBAHOCFKCLG6SSZQJPEG2GPO \
  | 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: b62e101dc22a84b37a52cc12f21b467b89762b9fe1e011aa491deff7d5a8a739

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "33badd08a7136e01d2d536951de7b7dd40ac1ad5b554afa779f626f3520b69c5",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2019-08-04T12:50:36Z",
    "title_canon_sha256": "6c7a9195c2c9f3c72625e8b3c1fb3f14c3fc94d4cc1bbe36702756662a15fded"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.01335",
    "kind": "arxiv",
    "version": 1
  }
}