Pith Number

pith:5VPNHSOP

pith:2015:5VPNHSOPJOVDIAFK2KVUCEZY7O

not attested not anchored not stored refs pending

The Massive Star Population of Cygnus OB2

Janet E. Drew, Michael Mohr-Smith, Nicholas J. Wright

arxiv:1502.05718 v2 · 2015-02-19 · 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{5VPNHSOPJOVDIAFK2KVUCEZY7O}

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	2026-05-18T01:41:00.665405Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ed5ed3c9cf4baa3400aad2ab411338fba72299434dd77c747a2902dde8be7d61

Aliases

arxiv: 1502.05718 · arxiv_version: 1502.05718v2 · doi: 10.48550/arxiv.1502.05718 · pith_short_12: 5VPNHSOPJOVD · pith_short_16: 5VPNHSOPJOVDIAFK · pith_short_8: 5VPNHSOP

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/5VPNHSOPJOVDIAFK2KVUCEZY7O \
  | 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: ed5ed3c9cf4baa3400aad2ab411338fba72299434dd77c747a2902dde8be7d61

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "51d1e954380abab8b2aae20dc8334bcf649db5dab217bb1a38b58a64a6ffefc8",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2015-02-19T21:00:26Z",
    "title_canon_sha256": "6979a5cdd3664575c01990d9b5209b565e12597dbdb13c51f14e13e3b4345599"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1502.05718",
    "kind": "arxiv",
    "version": 2
  }
}