Pith Number

pith:WSC6WEPM

pith:2021:WSC6WEPMIGQZ7O42ITMNXRRVL4

not attested not anchored not stored refs pending

Environmental thresholds for mass-extinction events

Beril Sirmacek, Guy R. McPherson, Ricardo Vinuesa

arxiv:2108.08933 v2 · 2021-08-19 · 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{WSC6WEPMIGQZ7O42ITMNXRRVL4}

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	2026-07-05T03:20:37.421784Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b485eb11ec41a19fbb9a44d8dbc6355f16ef50a2187834d404d82fd7fcd91156

Aliases

arxiv: 2108.08933 · arxiv_version: 2108.08933v2 · doi: 10.48550/arxiv.2108.08933 · pith_short_12: WSC6WEPMIGQZ · pith_short_16: WSC6WEPMIGQZ7O42 · pith_short_8: WSC6WEPM

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/WSC6WEPMIGQZ7O42ITMNXRRVL4 \
  | 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: b485eb11ec41a19fbb9a44d8dbc6355f16ef50a2187834d404d82fd7fcd91156

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2036694f85484121cc8e3bf18f4253db7e046ff420ffc625c5d6735df5501794",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2021-08-19T22:26:36Z",
    "title_canon_sha256": "380539148398a5a72de80becb133267c6010e744bb485fb2d0968f95db6bb912"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2108.08933",
    "kind": "arxiv",
    "version": 2
  }
}