Pith Number

pith:IGRK2ZLU

pith:1999:IGRK2ZLUA4HDOHD6LZP5EWVW46

not attested not anchored not stored refs pending

A Robust Classification of Galaxy Spectra: Dealing with Noisy and Incomplete Data

A.J. Connolly (UPitt), A.S. Szalay (JHU)

arxiv:astro-ph/9901300 v1 · 1999-01-21 · 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{IGRK2ZLUA4HDOHD6LZP5EWVW46}

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	2026-07-04T16:10:38.410400Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

41a2ad6574070e371c7e5e5fd25ab6e7be3d4d54f55a2484c9c2f6c00b9c55fe

Aliases

arxiv: astro-ph/9901300 · arxiv_version: astro-ph/9901300v1 · doi: 10.48550/arxiv.astro-ph/9901300 · pith_short_12: IGRK2ZLUA4HD · pith_short_16: IGRK2ZLUA4HDOHD6 · pith_short_8: IGRK2ZLU

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/IGRK2ZLUA4HDOHD6LZP5EWVW46 \
  | 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: 41a2ad6574070e371c7e5e5fd25ab6e7be3d4d54f55a2484c9c2f6c00b9c55fe

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4fdc9820a999c7f1162ddb07203b3eab3cdff5365b47fdb85f1d2b51acc03ed5",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-01-21T16:22:35Z",
    "title_canon_sha256": "acc8f6a249eb2de18a7c995755d9fc75dd3060bb7e51b5165c65034570aa4f85"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9901300",
    "kind": "arxiv",
    "version": 1
  }
}