Pith Number

pith:PLAMNDVS

pith:2021:PLAMNDVSAZ5DFKTTF67LKD35SQ

not attested not anchored not stored refs pending

Assessment of Ammonia as a Biosignature Gas in Exoplanet Atmospheres

Janusz J. Petkowski, Jingcheng Huang, Sara Seager, Sukrit Ranjan, Zhuchang Zhan

arxiv:2107.12424 v1 · 2021-07-26 · 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{PLAMNDVSAZ5DFKTTF67LKD35SQ}

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	2026-07-05T03:53:01.503756Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7ac0c68eb2067a32aa732fbeb50f7d942909d5532dd739dadabfcec159ade9b1

Aliases

arxiv: 2107.12424 · arxiv_version: 2107.12424v1 · doi: 10.48550/arxiv.2107.12424 · pith_short_12: PLAMNDVSAZ5D · pith_short_16: PLAMNDVSAZ5DFKTT · pith_short_8: PLAMNDVS

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/PLAMNDVSAZ5DFKTTF67LKD35SQ \
  | 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: 7ac0c68eb2067a32aa732fbeb50f7d942909d5532dd739dadabfcec159ade9b1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d9d5e4b5c494190dab1c7048efc341d31a8deb2c785839feda7381d0837ddfc3",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2021-07-26T18:33:04Z",
    "title_canon_sha256": "904bec4f215c5e1c185bf4618f16df34f8b0e224901f6b041d9079b6ad7b88c4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2107.12424",
    "kind": "arxiv",
    "version": 1
  }
}