Pith Number

pith:STT6W27K

pith:2019:STT6W27KIIWNPPSRHRVMPZMVE4

not attested not anchored not stored refs pending

Advanced Variations of Two-Dimensional Principal Component Analysis for Face Recognition

Dunwei Gong, Meixiang Zhao, Xiao Chen, Yunfeng Cai, Zhigang Jia

arxiv:1912.09970 v1 · 2019-12-19 · cs.CV · cs.NA · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{STT6W27KIIWNPPSRHRVMPZMVE4}

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	2026-07-05T00:27:39.815576Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

94e7eb6bea422cd7be513c6ac7e59527324b188f562a02d44997cf706a1049b7

Aliases

arxiv: 1912.09970 · arxiv_version: 1912.09970v1 · doi: 10.48550/arxiv.1912.09970 · pith_short_12: STT6W27KIIWN · pith_short_16: STT6W27KIIWNPPSR · pith_short_8: STT6W27K

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/STT6W27KIIWNPPSRHRVMPZMVE4 \
  | 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: 94e7eb6bea422cd7be513c6ac7e59527324b188f562a02d44997cf706a1049b7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5cc9bbe1401e223ac295704a71098ee233132d85fc8222988af4b34d0240014f",
    "cross_cats_sorted": [
      "cs.NA",
      "math.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2019-12-19T08:38:24Z",
    "title_canon_sha256": "8575886a0df41603b4e0310890a8593b6bf99d9e47809f5df0d63b04e32d29e7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1912.09970",
    "kind": "arxiv",
    "version": 1
  }
}