Pith Number

pith:SQCEU2FY

pith:2004:SQCEU2FYDKXWGREVB3UTUIL3SM

not attested not anchored not stored refs pending

2QZJ215454.3-305654: a radio-quiet BL Lac object or lineless QSO?

2), (2) Anglo-Australian Observatory, (3) Landessternwarte Heidelberg, 4) ((1) University of Sydney, (4) ATNF), B.J. Boyle (4, D. Londish (1, J. Heidt (3), L. Kedziora-Chudczer (1, S.M. Croom (2)

arxiv:astro-ph/0404574 v1 · 2004-04-29 · 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{SQCEU2FYDKXWGREVB3UTUIL3SM}

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	2026-05-18T04:27:04.520884Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

94044a68b81aaf6344950ee93a217b93065005ce47e0a527529933d740ee2e30

Aliases

arxiv: astro-ph/0404574 · arxiv_version: astro-ph/0404574v1 · doi: 10.48550/arxiv.astro-ph/0404574 · pith_short_12: SQCEU2FYDKXW · pith_short_16: SQCEU2FYDKXWGREV · pith_short_8: SQCEU2FY

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/SQCEU2FYDKXWGREVB3UTUIL3SM \
  | 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: 94044a68b81aaf6344950ee93a217b93065005ce47e0a527529933d740ee2e30

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7084f9b27fcac80bcf42c74562ef2c38757b03b2c628acf93012ea5b1b0cab05",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-04-29T08:27:22Z",
    "title_canon_sha256": "d110b73b9f76efea4d98cefb62a71385510bf8071ee79a2de242058b5a14a007"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0404574",
    "kind": "arxiv",
    "version": 1
  }
}