Pith Number

pith:4VGAZFTZ

pith:2019:4VGAZFTZE3XOBMSHOEYFSXHH72

not attested not anchored not stored refs pending

NOODL: Provable Online Dictionary Learning and Sparse Coding

Jarvis Haupt, Sirisha Rambhatla, Xingguo Li

arxiv:1902.11261 v5 · 2019-02-28 · cs.LG · cs.NE · stat.ML

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4VGAZFTZE3XOBMSHOEYFSXHH72}

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	2026-07-05T00:00:14.028137Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e54c0c967926eee0b2477130595ce7fe860e4ab5ccbcf7977acbfefb8205ae3b

Aliases

arxiv: 1902.11261 · arxiv_version: 1902.11261v5 · doi: 10.48550/arxiv.1902.11261 · pith_short_12: 4VGAZFTZE3XO · pith_short_16: 4VGAZFTZE3XOBMSH · pith_short_8: 4VGAZFTZ

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/4VGAZFTZE3XOBMSHOEYFSXHH72 \
  | 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: e54c0c967926eee0b2477130595ce7fe860e4ab5ccbcf7977acbfefb8205ae3b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ffd5c5a99ae487fd01fefe3e3e51958c4d929c1d4f8f9fd05033a26eadcd9807",
    "cross_cats_sorted": [
      "cs.NE",
      "stat.ML"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2019-02-28T18:08:01Z",
    "title_canon_sha256": "69caf6870bc3bc0cfc314ce45c53fcb01f75d7bf28c15faaea9f8486c6f5a65a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.11261",
    "kind": "arxiv",
    "version": 5
  }
}