Pith Number

pith:4Q4MRW4A

pith:2004:4Q4MRW4AAV2V7UU5HBLWFYEFPG

not attested not anchored not stored refs pending

The Location of the Core in M81

M. F. Bietenholz, M. P. Rupen, N. Bartel

arxiv:astro-ph/0407619 v3 · 2004-07-29 · 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{4Q4MRW4AAV2V7UU5HBLWFYEFPG}

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	2026-07-04T16:44:24.397831Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e438c8db8005755fd29d385762e08579abe718542d88f68b31eaf1df7ea1fca8

Aliases

arxiv: astro-ph/0407619 · arxiv_version: astro-ph/0407619v3 · doi: 10.48550/arxiv.astro-ph/0407619 · pith_short_12: 4Q4MRW4AAV2V · pith_short_16: 4Q4MRW4AAV2V7UU5 · pith_short_8: 4Q4MRW4A

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/4Q4MRW4AAV2V7UU5HBLWFYEFPG \
  | 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: e438c8db8005755fd29d385762e08579abe718542d88f68b31eaf1df7ea1fca8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c1e8d9e8a4a6afdc18a799f95adcc8b96c4e7a4e4ec06ec4455ec57e18282bee",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-07-29T18:50:28Z",
    "title_canon_sha256": "a4b113c36f0a3cbbee4fb5c17489f2938a53dc4eb597a2fa499973ffa7701ced"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0407619",
    "kind": "arxiv",
    "version": 3
  }
}