Pith Number

pith:O2VKPD6Q

pith:2011:O2VKPD6QDY5DZPHIMFTDJQSYDK

not attested not anchored not stored refs pending

On Problems as Hard as CNFSAT

Daniel Lokshtanov, Daniel Marx, Holger Dell, Jesper Nederlof, Magnus Wahlstrom, Marek Cygan, Ramamohan Paturi, Saket Saurabh, Yoshio Okamoto

arxiv:1112.2275 v3 · 2011-12-10 · cs.DS · cs.CC · cs.DM

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	2026-05-18T00:17:55.801324Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

76aaa78fd01e3a3cbce8616634c2581a941a7f752fb93fd681442eacdb0499e2

Aliases

arxiv: 1112.2275 · arxiv_version: 1112.2275v3 · doi: 10.48550/arxiv.1112.2275 · pith_short_12: O2VKPD6QDY5D · pith_short_16: O2VKPD6QDY5DZPHI · pith_short_8: O2VKPD6Q

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/O2VKPD6QDY5DZPHIMFTDJQSYDK \
  | 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: 76aaa78fd01e3a3cbce8616634c2581a941a7f752fb93fd681442eacdb0499e2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2b9c0be820c63a551cbf2767a93d9e341ffab1d9d2122ca3b46386ac9c645df6",
    "cross_cats_sorted": [
      "cs.CC",
      "cs.DM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2011-12-10T13:19:33Z",
    "title_canon_sha256": "b8dd404e50cf7eed1c82bcecb47e62fbfcdc5b50f09662047ef59cbf54138642"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1112.2275",
    "kind": "arxiv",
    "version": 3
  }
}