Pith Number

pith:R2PCLKWR

pith:2010:R2PCLKWRD3DQB2XKPKH3INZM3G

not attested not anchored not stored refs pending

The doubling of the superorbital period of Cyg X-1

Andrzej A. Zdziarski, Gerald K. Skinner, Guy G. Pooley

arxiv:1009.2907 v2 · 2010-09-15 · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{R2PCLKWRD3DQB2XKPKH3INZM3G}

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	2026-05-18T02:05:30.198521Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8e9e25aad11ec700eaea7a8fb4372cd9a23adfe93669ead8ffd0cdd52f0f0685

Aliases

arxiv: 1009.2907 · arxiv_version: 1009.2907v2 · doi: 10.48550/arxiv.1009.2907 · pith_short_12: R2PCLKWRD3DQ · pith_short_16: R2PCLKWRD3DQB2XK · pith_short_8: R2PCLKWR

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/R2PCLKWRD3DQB2XKPKH3INZM3G \
  | 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: 8e9e25aad11ec700eaea7a8fb4372cd9a23adfe93669ead8ffd0cdd52f0f0685

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b22eccc6967be5e76dea31c6e15d5eb1511421210bcc37aa56b037edf775da6e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2010-09-15T12:13:22Z",
    "title_canon_sha256": "550143c169e335570f2de22591e4c18cd2dca27ca6d70412926d515110b45e2f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1009.2907",
    "kind": "arxiv",
    "version": 2
  }
}