Pith Number

pith:FIUDEX4J

pith:2009:FIUDEX4J2Y5ILQHSV4C5VMDDYT

not attested not anchored not stored refs pending

The Ultraviolet Spectrum and Physical Properties of the Mass Donor Star in HD 226868 = Cygnus X-1

A. Herrero, C. T. Bolton, D. R. Gies, L. Kaper, M. V. McSwain, P. Hadrava, P. Koubsky, S. B. Howell, S. M. Caballero-Nieves, T. C. Hillwig, W. Huang

arxiv:0907.2422 v1 · 2009-07-14 · 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{FIUDEX4J2Y5ILQHSV4C5VMDDYT}

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	2026-07-04T17:19:31.671130Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2a28325f89d63a85c0f2af05dab063c4f938dc9fcee4db72ead68a7763c86cf8

Aliases

arxiv: 0907.2422 · arxiv_version: 0907.2422v1 · doi: 10.48550/arxiv.0907.2422 · pith_short_12: FIUDEX4J2Y5I · pith_short_16: FIUDEX4J2Y5ILQHS · pith_short_8: FIUDEX4J

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/FIUDEX4J2Y5ILQHSV4C5VMDDYT \
  | 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: 2a28325f89d63a85c0f2af05dab063c4f938dc9fcee4db72ead68a7763c86cf8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fbd3fb5d927b824fa9cb97ccde601b9a854fc06455ec6178dddd07d2578de5d5",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2009-07-14T18:27:47Z",
    "title_canon_sha256": "b3316205e70b199f5aea06c130128f79de85bb36703b44b5cd948c4ed1c72647"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.2422",
    "kind": "arxiv",
    "version": 1
  }
}