Pith Number

pith:HGPWC6L7

pith:2015:HGPWC6L7X72F5ERXCOTBD4BEPW

not attested not anchored not stored refs pending

Optimized Projection for Sparse Representation Based Classification

Can-Yi Lu, De-Shuang Huang

arxiv:1502.00115 v1 · 2015-01-31 · cs.CV

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HGPWC6L7X72F5ERXCOTBD4BEPW}

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	2026-05-18T02:28:12.752351Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

399f61797fbff45e923713a611f0247dadb9d90f62e63843eb0845d55e0911ef

Aliases

arxiv: 1502.00115 · arxiv_version: 1502.00115v1 · doi: 10.48550/arxiv.1502.00115 · pith_short_12: HGPWC6L7X72F · pith_short_16: HGPWC6L7X72F5ERX · pith_short_8: HGPWC6L7

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/HGPWC6L7X72F5ERXCOTBD4BEPW \
  | 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: 399f61797fbff45e923713a611f0247dadb9d90f62e63843eb0845d55e0911ef

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f7d9c882ad83b4a4c89ef34d83bc3615b365805a7c0e91499e90ec17b55f3074",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2015-01-31T14:44:05Z",
    "title_canon_sha256": "6ca6b0228a3a231f92d8ca260a5d8d4af0ba321a3e6c3bf311580d78a7c59fd6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1502.00115",
    "kind": "arxiv",
    "version": 1
  }
}