Pith Number

pith:66E6OYSD

pith:2014:66E6OYSDMY462T5FCIKOSI5W4F

not attested not anchored not stored refs pending

Bejeweled, Candy Crush and other Match-Three Games are (NP-)Hard

Emanuele Natale, Luciano Gual\`a, Stefano Leucci

arxiv:1403.5830 v1 · 2014-03-24 · cs.CC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{66E6OYSDMY462T5FCIKOSI5W4F}

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	2026-05-18T02:55:47.649033Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f789e762436639ed4fa51214e923b6e15a84c94e7e3c9170e89272dee4f2ccc3

Aliases

arxiv: 1403.5830 · arxiv_version: 1403.5830v1 · doi: 10.48550/arxiv.1403.5830 · pith_short_12: 66E6OYSDMY46 · pith_short_16: 66E6OYSDMY462T5F · pith_short_8: 66E6OYSD

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/66E6OYSDMY462T5FCIKOSI5W4F \
  | 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: f789e762436639ed4fa51214e923b6e15a84c94e7e3c9170e89272dee4f2ccc3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1c14fb79c36fc022ae5ae3496eb0ae89185f8daaeacbb109cf4c2d2f9ab3a7c1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2014-03-24T01:51:19Z",
    "title_canon_sha256": "21974eda8586d67874fb90908029f8b07417b965d103861c05d609924bd6fa0c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1403.5830",
    "kind": "arxiv",
    "version": 1
  }
}