Pith Number

pith:3OPLRGXF

pith:2019:3OPLRGXFFSQIUQ3U5PNURYNJNK

not attested not anchored not stored refs pending

Optimal Collusion-Free Teaching

David Kirkpatrick, Hans U. Simon, Sandra Zilles

arxiv:1903.04012 v1 · 2019-03-10 · cs.LG · 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{3OPLRGXFFSQIUQ3U5PNURYNJNK}

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	2026-05-17T23:51:40.331119Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

db9eb89ae52ca08a4374ebdb48e1a96a88cf0d6aa86fdcf395d2b79fc3a38050

Aliases

arxiv: 1903.04012 · arxiv_version: 1903.04012v1 · doi: 10.48550/arxiv.1903.04012 · pith_short_12: 3OPLRGXFFSQI · pith_short_16: 3OPLRGXFFSQIUQ3U · pith_short_8: 3OPLRGXF

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/3OPLRGXFFSQIUQ3U5PNURYNJNK \
  | 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: db9eb89ae52ca08a4374ebdb48e1a96a88cf0d6aa86fdcf395d2b79fc3a38050

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "21e8af9ad4c5f9f305cefb08516ed7d7f75e856e7f20160d95c26e1aa017e56e",
    "cross_cats_sorted": [
      "stat.ML"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2019-03-10T15:23:05Z",
    "title_canon_sha256": "d235e0fd0ac8ee1196ff83fb53b3b0959129a951ee5bfcf4804e9d81be7aacd3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.04012",
    "kind": "arxiv",
    "version": 1
  }
}