Pith Number

pith:TN2MMR6A

pith:1997:TN2MMR6ATA52MHLWDYMCIRRGJL

not attested not anchored not stored refs pending

Life Extinctions By Cosmic Ray Bursts

Ari Laor, Arnon Dar, Nir J. Shaviv

arxiv:astro-ph/9705008 v1 · 1997-05-02 · astro-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{TN2MMR6ATA52MHLWDYMCIRRGJL}

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.

Cited by

1 paper in Pith

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

Receipt and verification

First computed	2026-07-04T15:23:01.469452Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9b74c647c0983ba61d761e182446264aca19021a9a5f43246db8c8cea118cdf4

Aliases

arxiv: astro-ph/9705008 · arxiv_version: astro-ph/9705008v1 · doi: 10.48550/arxiv.astro-ph/9705008 · pith_short_12: TN2MMR6ATA52 · pith_short_16: TN2MMR6ATA52MHLW · pith_short_8: TN2MMR6A

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/TN2MMR6ATA52MHLWDYMCIRRGJL \
  | 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: 9b74c647c0983ba61d761e182446264aca19021a9a5f43246db8c8cea118cdf4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2a7030bbf5fee46728d170dd8aae64c7912d09cda1bcdf1961366d62dd7c2997",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1997-05-02T06:47:46Z",
    "title_canon_sha256": "d9a3c9012b8ff9112c095feb622d775fea70d8bc59c89292695f827f20ed060d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9705008",
    "kind": "arxiv",
    "version": 1
  }
}