Pith Number

pith:XNCI5PL4

pith:2013:XNCI5PL4JYIZLGR7ZDOO6MAN7W

not attested not anchored not stored refs pending

Constraints on Massive Star Formation: Cygnus OB2 was always an Association

Jeremy J. Drake (SAO), Nicholas J. Wright (Herts), Richard J. Parker (ETH Zurich), Simon P. Goodwin (Sheffield)

arxiv:1311.4537 v1 · 2013-11-18 · 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{XNCI5PL4JYIZLGR7ZDOO6MAN7W}

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	2026-05-18T01:46:23.414073Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bb448ebd7c4e11959a3fc8dcef300dfd891585eb618ddbf3e06958c2d19c08d8

Aliases

arxiv: 1311.4537 · arxiv_version: 1311.4537v1 · doi: 10.48550/arxiv.1311.4537 · pith_short_12: XNCI5PL4JYIZ · pith_short_16: XNCI5PL4JYIZLGR7 · pith_short_8: XNCI5PL4

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/XNCI5PL4JYIZLGR7ZDOO6MAN7W \
  | 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: bb448ebd7c4e11959a3fc8dcef300dfd891585eb618ddbf3e06958c2d19c08d8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7b1bdd1dc2e479f6134112c6fcf974f48385ff5d9f7b7a47e311c7c59b36ebde",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2013-11-18T21:00:00Z",
    "title_canon_sha256": "1f64734a9b84e759d198fd3338ed6dcc4794a93d68b61114665d8d63c8dc173a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1311.4537",
    "kind": "arxiv",
    "version": 1
  }
}