Pith Number

pith:EUSGYPXB

pith:1997:EUSGYPXBZQ4BM5YDRTJI7HRSCH

not attested not anchored not stored refs pending

Is there really a super-massive black hole in M87?

A. Capetti (SISSA), A. Marconi (STScI), D.J. Axon (STScI), F.D. Macchetto (STScI), P. Crane (ESO), W.B. Sparks (STScI)

arxiv:astro-ph/9706246 v1 · 1997-06-24 · 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{EUSGYPXBZQ4BM5YDRTJI7HRSCH}

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	2026-05-18T01:22:58.733379Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

25246c3ee1cc381677038cd28f9e3211dcc7831cb0fb0d4d10456be5abb448dd

Aliases

arxiv: astro-ph/9706246 · arxiv_version: astro-ph/9706246v1 · doi: 10.48550/arxiv.astro-ph/9706246 · pith_short_12: EUSGYPXBZQ4B · pith_short_16: EUSGYPXBZQ4BM5YD · pith_short_8: EUSGYPXB

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/EUSGYPXBZQ4BM5YDRTJI7HRSCH \
  | 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: 25246c3ee1cc381677038cd28f9e3211dcc7831cb0fb0d4d10456be5abb448dd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "364ef7a42442f8a5099eef256652c8566eefc54873f8555852c6c20e535603c6",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1997-06-24T14:14:50Z",
    "title_canon_sha256": "980fdc2a90b61d644533dbe5e3c54ccde665ad65b71d2128c3a395f2d10e0f3f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9706246",
    "kind": "arxiv",
    "version": 1
  }
}