Pith Number

pith:Z6U7JFHY

pith:2015:Z6U7JFHY46MQ774LMGADMLAXRH

not attested not anchored not stored refs pending

Nonphotosynthetic Pigments as Potential Biosignatures

Charles S. Cockell, Edward W. Schwieterman, Victoria S. Meadows

arxiv:1505.04752 v1 · 2015-05-18 · 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{Z6U7JFHY46MQ774LMGADMLAXRH}

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	2026-05-18T02:07:24.716102Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cfa9f494f8e7990fff8b6180362c1789eedecc5c265bc0eb3c81ddf7114d0c3d

Aliases

arxiv: 1505.04752 · arxiv_version: 1505.04752v1 · doi: 10.48550/arxiv.1505.04752 · pith_short_12: Z6U7JFHY46MQ · pith_short_16: Z6U7JFHY46MQ774L · pith_short_8: Z6U7JFHY

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/Z6U7JFHY46MQ774LMGADMLAXRH \
  | 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: cfa9f494f8e7990fff8b6180362c1789eedecc5c265bc0eb3c81ddf7114d0c3d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "305afdf8a7674eb747726462d254a3dc62c5a70bf171a87aa827c6cc284e8f3b",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-sa/3.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2015-05-18T18:36:12Z",
    "title_canon_sha256": "52fdebd5225dcdffb0a538af548b37f56dea8159e3ff55d0291cb20b9e776b0f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1505.04752",
    "kind": "arxiv",
    "version": 1
  }
}