Pith Number

pith:42OPPZX3

pith:2015:42OPPZX3RGK6FKJSI2VRWDOVUE

not attested not anchored not stored refs pending

Post first dredge-up [C/N] ratio as age indicator. Theoretical calibration

(2) INAF-Osservatorio Astronomico di Collurania, 3) ((1) Astrophysics Research Institute, (3) Instituto de Astrofisica de Canarias, Adriano Pietrinferni (2), Anna M. Piersimoni (2), Italy, La Laguna, Liverpool John Moores University, Maurizio Salaris (1), Santi Cassisi (2, Spain), United Kingdom

arxiv:1509.06904 v1 · 2015-09-23 · astro-ph.SR

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{42OPPZX3RGK6FKJSI2VRWDOVUE}

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	2026-05-18T01:27:22.528581Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e69cf7e6fb8995e2a93246ab1b0dd5a1048282f4f9f47c170434d9f966a5c6c1

Aliases

arxiv: 1509.06904 · arxiv_version: 1509.06904v1 · doi: 10.48550/arxiv.1509.06904 · pith_short_12: 42OPPZX3RGK6 · pith_short_16: 42OPPZX3RGK6FKJS · pith_short_8: 42OPPZX3

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/42OPPZX3RGK6FKJSI2VRWDOVUE \
  | 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: e69cf7e6fb8995e2a93246ab1b0dd5a1048282f4f9f47c170434d9f966a5c6c1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f4e3db8f31f6248a3b80427643508ab8ada6cd9c44333858097e840c5a944209",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2015-09-23T10:01:43Z",
    "title_canon_sha256": "eb976591cad89d1632ee0ad3c33f0129b5d98b36050e6b4e30942de7df872cdb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1509.06904",
    "kind": "arxiv",
    "version": 1
  }
}