Pith Number

pith:HFK7NNE5

pith:1998:HFK7NNE5QJOFGK4SECBMXJOGSF

not attested not anchored not stored refs pending

ASCA observations of two steep soft X-ray quasars

A. Siemiginowska, B. J. Wilkes, F. Fiore, F. Nicastro, G. Matt, K. M. Leighly, L. Piro, M. Cappi, M. Elvis

arxiv:astro-ph/9804256 v1 · 1998-04-24 · 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{HFK7NNE5QJOFGK4SECBMXJOGSF}

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	2026-07-04T16:06:20.075864Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3955f6b49d825c532b922082cba5c69164df02efa4d80dfe1b9730a958747d9e

Aliases

arxiv: astro-ph/9804256 · arxiv_version: astro-ph/9804256v1 · doi: 10.48550/arxiv.astro-ph/9804256 · pith_short_12: HFK7NNE5QJOF · pith_short_16: HFK7NNE5QJOFGK4S · pith_short_8: HFK7NNE5

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/HFK7NNE5QJOFGK4SECBMXJOGSF \
  | 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: 3955f6b49d825c532b922082cba5c69164df02efa4d80dfe1b9730a958747d9e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "49731369af183b26bf947fd85fd6dd84bd5a8dc5cd4ee98eede343a91b14996b",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1998-04-24T08:26:04Z",
    "title_canon_sha256": "2aee08089b16ff157b9f5e36f61f50a6c409ba5a7a39fbeb8cece1f6dc3a9829"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9804256",
    "kind": "arxiv",
    "version": 1
  }
}