Pith Number

pith:Z5U67ZBX

pith:2026:Z5U67ZBXMIE56NX2MFNHNJDL5Y

not attested not anchored not stored refs pending

Robustness Analysis of USmorph: II. Optimizing Feature Extraction, Dimensionality Reduction, and Clustering for Unsupervised Galaxy Morphology Classification

Chichun Zhou, Guanwen Fang, Jie Song, Shiwei Zhu, Xiaolei Yin, Xu Kong, Yirui Zheng, Zesen Lin

arxiv:2605.20871 v1 · 2026-05-20 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Z5U67ZBXMIE56NX2MFNHNJDL5Y}

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	2026-05-21T01:05:25.568892Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cf69efe4376209df36fa615a76a46bee274faabad331eff208b2b3ad2725f681

Aliases

arxiv: 2605.20871 · arxiv_version: 2605.20871v1 · doi: 10.48550/arxiv.2605.20871 · pith_short_12: Z5U67ZBXMIE5 · pith_short_16: Z5U67ZBXMIE56NX2 · pith_short_8: Z5U67ZBX

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/Z5U67ZBXMIE56NX2MFNHNJDL5Y \
  | 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: cf69efe4376209df36fa615a76a46bee274faabad331eff208b2b3ad2725f681

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "71e0e15916756feaab1ef609f723b35d725093c4227dc49bc63011db7d549ec2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-05-20T08:08:17Z",
    "title_canon_sha256": "da53a6e480db0a2fb95fab415bd6bb4458607531181a669205eb2a89a7bae8b0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.20871",
    "kind": "arxiv",
    "version": 1
  }
}