Pith Number

pith:PVOCXORG

pith:2016:PVOCXORGQM2AF2GNDIX37I2LMD

not attested not anchored not stored refs pending

Upper bounds on the size of covering arrays

Charles J. Colbourn, Kaushik Sarkar

arxiv:1603.07809 v1 · 2016-03-25 · 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	2026-05-18T01:18:17.781461Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7d5c2bba26833402e8cd1a2fbfa34b60d8737485da3c3d935a5e5c0303e3f065

Aliases

arxiv: 1603.07809 · arxiv_version: 1603.07809v1 · doi: 10.48550/arxiv.1603.07809 · pith_short_12: PVOCXORGQM2A · pith_short_16: PVOCXORGQM2AF2GN · pith_short_8: PVOCXORG

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/PVOCXORGQM2AF2GNDIX37I2LMD \
  | 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: 7d5c2bba26833402e8cd1a2fbfa34b60d8737485da3c3d935a5e5c0303e3f065

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a32a6b81a66277136bf213af96810b07f2fefdb61a3f978e5e524ab0f23abac1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2016-03-25T02:50:39Z",
    "title_canon_sha256": "36b88b8e4554bad28243df0c2121ef9a23253b44d2d11d31651c4e48f0759e4b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1603.07809",
    "kind": "arxiv",
    "version": 1
  }
}