Pith Number

pith:UBRIIAPP

pith:2021:UBRIIAPPFAWHQ2FYHWB7GJXNWY

not attested not anchored not stored refs pending

Potential Black Hole Seeding of the Spiral Galaxy NGC 4424 via an Infalling Star Cluster

Alister W. Graham, Benjamin L. Davis, Bogdan C. Ciambur, Douglas A. Swartz, Roberto Soria

arxiv:2112.05318 v1 · 2021-12-10 · astro-ph.GA · astro-ph.HE

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UBRIIAPPFAWHQ2FYHWB7GJXNWY}

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	2026-07-05T03:41:42.508003Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a0628401ef282c7868b83d83f326edb61b8970b1a02029168eea789c8fb43b26

Aliases

arxiv: 2112.05318 · arxiv_version: 2112.05318v1 · doi: 10.48550/arxiv.2112.05318 · pith_short_12: UBRIIAPPFAWH · pith_short_16: UBRIIAPPFAWHQ2FY · pith_short_8: UBRIIAPP

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/UBRIIAPPFAWHQ2FYHWB7GJXNWY \
  | 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: a0628401ef282c7868b83d83f326edb61b8970b1a02029168eea789c8fb43b26

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "392411dc09af7402e4a59bc8d474ec60fb9de19a5d93f94305ec00ae8e9a8a6e",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2021-12-10T03:41:46Z",
    "title_canon_sha256": "bbccce6fca31a447d7c1c9d5c3b23590add0e5422963db63c4de6d4c88b680d6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2112.05318",
    "kind": "arxiv",
    "version": 1
  }
}