Pith Number

pith:7MUBNGJW

pith:2016:7MUBNGJWJ26RGJAINCDQ2IN2G2

not attested not anchored not stored refs pending

Two-stage algorithms for covering array construction

Charles J. Colbourn, Kaushik Sarkar

arxiv:1606.06730 v1 · 2016-06-21 · cs.DS · cs.DM · cs.SE · math.CO

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

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	2026-05-18T01:12:01.208663Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fb281699364ebd13240868870d21ba36b520f4b6108d86788adcd14dea651908

Aliases

arxiv: 1606.06730 · arxiv_version: 1606.06730v1 · doi: 10.48550/arxiv.1606.06730 · pith_short_12: 7MUBNGJWJ26R · pith_short_16: 7MUBNGJWJ26RGJAI · pith_short_8: 7MUBNGJW

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/7MUBNGJWJ26RGJAINCDQ2IN2G2 \
  | 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: fb281699364ebd13240868870d21ba36b520f4b6108d86788adcd14dea651908

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e3f3312c32df6366f51047e7e7e69d3eeb695bcc52b9d408c1ed8ee6ef4dad45",
    "cross_cats_sorted": [
      "cs.DM",
      "cs.SE",
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2016-06-21T04:01:39Z",
    "title_canon_sha256": "fe2a6b6c74bf51e192aa48f6d596ec38da8729b7077765bd1ed25fe0b8595d40"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1606.06730",
    "kind": "arxiv",
    "version": 1
  }
}