Pith Number

pith:64ZEAOFB

pith:1997:64ZEAOFBAYGUK2C2Z6GYE3Z5Q5

not attested not anchored not stored refs pending

Ginga observations of Cygnus X-2

E. Kuulkers, G. Hasinger, K. Asai, M. van der Klis, R. A. D. Wijnands

arxiv:astro-ph/9704229 v1 · 1997-04-23 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{64ZEAOFBAYGUK2C2Z6GYE3Z5Q5}

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	2026-07-04T14:15:06.369126Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f7324038a1060d45685acf8d826f3d874860af723ad08b6c3da6c3da95e47c8f

Aliases

arxiv: astro-ph/9704229 · arxiv_version: astro-ph/9704229v1 · doi: 10.48550/arxiv.astro-ph/9704229 · pith_short_12: 64ZEAOFBAYGU · pith_short_16: 64ZEAOFBAYGUK2C2 · pith_short_8: 64ZEAOFB

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/64ZEAOFBAYGUK2C2Z6GYE3Z5Q5 \
  | 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: f7324038a1060d45685acf8d826f3d874860af723ad08b6c3da6c3da95e47c8f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3943c7b4f554fdf96d5b09aa4a505da564f5b76323799035fa45fe4bf5125421",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1997-04-23T15:27:36Z",
    "title_canon_sha256": "196f64ef82d7b99598a0053550d7a18203adcf0e37e8c52fa1171ace5db87ba3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9704229",
    "kind": "arxiv",
    "version": 1
  }
}