Pith Number

pith:KVB3MW7D

pith:1999:KVB3MW7D7TJEJPDJFJKAEBMA3L

not attested not anchored not stored refs pending

The Steep Spectrum Quasar PG1404+226 with ASCA, HST and ROSAT

Andrea Comastri (Osservatorio Astronomico di Bologna), Marie-Helene Ulrich (ESO Garching), Phil Crane (Dartmouth College), Stefanie Komossa (MPE Garching)

arxiv:astro-ph/9907150 v1 · 1999-07-12 · 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{KVB3MW7D7TJEJPDJFJKAEBMA3L}

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	2026-05-18T01:07:36.295804Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5543b65be3fcd244bc692a54020580dad82d1ad6a9290430c828cea7aab40b98

Aliases

arxiv: astro-ph/9907150 · arxiv_version: astro-ph/9907150v1 · doi: 10.48550/arxiv.astro-ph/9907150 · pith_short_12: KVB3MW7D7TJE · pith_short_16: KVB3MW7D7TJEJPDJ · pith_short_8: KVB3MW7D

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/KVB3MW7D7TJEJPDJFJKAEBMA3L \
  | 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: 5543b65be3fcd244bc692a54020580dad82d1ad6a9290430c828cea7aab40b98

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "433db7b0ad2846b4db1dae1b24c4e7fd652f97b50f73d7a18644f7804f678291",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-07-12T16:00:05Z",
    "title_canon_sha256": "bad5f698a6d87ce5260086cde1dc7eb404e78040a4647ae3c0c8edabadbf5a52"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9907150",
    "kind": "arxiv",
    "version": 1
  }
}