Pith Number

pith:Y3Y25OZ4

pith:1999:Y3Y25OZ44HNPHGH6IMHHLPW32H

not attested not anchored not stored refs pending

The influence of bulge profile shapes on claims for a scale-free Hubble sequence for spirals

Alister W. Graham, Mercedes Prieto

arxiv:astro-ph/9908131 v2 · 1999-08-12 · 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{Y3Y25OZ44HNPHGH6IMHHLPW32H}

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	2026-05-18T03:57:01.123509Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c6f1aebb3ce1daf398fe430e75bedbd1e802b19b51983588dd6b8b811d68332c

Aliases

arxiv: astro-ph/9908131 · arxiv_version: astro-ph/9908131v2 · doi: 10.48550/arxiv.astro-ph/9908131 · pith_short_12: Y3Y25OZ44HNP · pith_short_16: Y3Y25OZ44HNPHGH6 · pith_short_8: Y3Y25OZ4

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/Y3Y25OZ44HNPHGH6IMHHLPW32H \
  | 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: c6f1aebb3ce1daf398fe430e75bedbd1e802b19b51983588dd6b8b811d68332c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f7ad02e6be61844a2df2a9bd4125c2112daa87ab19d56e899151fe29132e01e9",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-08-12T13:05:07Z",
    "title_canon_sha256": "9c6dfcb43c67faed400c21f7415ee3bb6169cef276933b6bc1b03405074242f6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9908131",
    "kind": "arxiv",
    "version": 2
  }
}