Pith Number

pith:YB5YBBHB

pith:2018:YB5YBBHBTTDYDGCCCBDXBHTNXW

not attested not anchored not stored refs pending

Machine learning in APOGEE: Unsupervised spectral classification with $K$-means

Carlos Allende Prieto, Ignacio Ordov\'as-Pascual, Jorge S\'anchez Almeida, Rafael Garcia-Dias

arxiv:1801.07912 v2 · 2018-01-24 · astro-ph.IM · astro-ph.GA · astro-ph.SR · cs.LG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{YB5YBBHBTTDYDGCCCBDXBHTNXW}

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	2026-05-18T00:16:26.874299Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c07b8084e19cc78198421047709e6dbd826e65dd7e8b51189e116969710edbc1

Aliases

arxiv: 1801.07912 · arxiv_version: 1801.07912v2 · doi: 10.48550/arxiv.1801.07912 · pith_short_12: YB5YBBHBTTDY · pith_short_16: YB5YBBHBTTDYDGCC · pith_short_8: YB5YBBHB

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/YB5YBBHBTTDYDGCCCBDXBHTNXW \
  | 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: c07b8084e19cc78198421047709e6dbd826e65dd7e8b51189e116969710edbc1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3baf88f2e6f99e947cb0d28856aa5afef9228d998299f7297379730a621e4e86",
    "cross_cats_sorted": [
      "astro-ph.GA",
      "astro-ph.SR",
      "cs.LG"
    ],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2018-01-24T10:24:23Z",
    "title_canon_sha256": "80e10c75073d5469fa54338d20da67bd49c931ed672ee1d4f51a6d8cfb7c9012"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1801.07912",
    "kind": "arxiv",
    "version": 2
  }
}