Pith Number

pith:PE2POKOH

pith:2004:PE2POKOHLC2J3HCGBSUA32GAMN

not attested not anchored not stored refs pending

Chandra's Discovery of Activity in the Quiescent Nuclear Black Hole of NGC 821

A. Baldi, A. Siemiginowska, A. Zezas, G. Fabbiano, J. McDowell, M. Elvis, S. Pellegrini

arxiv:astro-ph/0405358 v1 · 2004-05-18 · 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{PE2POKOHLC2J3HCGBSUA32GAMN}

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	2026-05-18T01:40:37.030823Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7934f729c758b49d9c460ca80de8c06360dd90fb58533914e68c2f482e29481e

Aliases

arxiv: astro-ph/0405358 · arxiv_version: astro-ph/0405358v1 · doi: 10.48550/arxiv.astro-ph/0405358 · pith_short_12: PE2POKOHLC2J · pith_short_16: PE2POKOHLC2J3HCG · pith_short_8: PE2POKOH

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/PE2POKOHLC2J3HCGBSUA32GAMN \
  | 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: 7934f729c758b49d9c460ca80de8c06360dd90fb58533914e68c2f482e29481e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cb4f2b76445596b7c9a67c94a5fa5f5873330eba05151a0b60be48f72fe78dcc",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-05-18T21:14:25Z",
    "title_canon_sha256": "a31b9eace698c862fb3be01b167f50a8767918b4ec6e545e27212bb8504bfb85"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0405358",
    "kind": "arxiv",
    "version": 1
  }
}