Pith Number

pith:55PW2N6S

pith:2016:55PW2N6SSRGKKUDMNP4RKKT7AQ

not attested not anchored not stored refs pending

Hanabi is NP-hard, Even for Cheaters who Look at Their Cards

Andr\'e van Renssen, Jean-Francois Baffier, Man-Kwun Chiu, Marcel Roeloffzen, Matias Korman, Valia Mitsou, Yago Diez, Yushi Uno

arxiv:1603.01911 v3 · 2016-03-07 · cs.DM · 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{55PW2N6SSRGKKUDMNP4RKKT7AQ}

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	2026-05-18T00:49:06.865369Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ef5f6d37d2944ca5506c6bf9152a7f043bc6d458500d33cb1850cf3301278e52

Aliases

arxiv: 1603.01911 · arxiv_version: 1603.01911v3 · doi: 10.48550/arxiv.1603.01911 · pith_short_12: 55PW2N6SSRGK · pith_short_16: 55PW2N6SSRGKKUDM · pith_short_8: 55PW2N6S

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/55PW2N6SSRGKKUDMNP4RKKT7AQ \
  | 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: ef5f6d37d2944ca5506c6bf9152a7f043bc6d458500d33cb1850cf3301278e52

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "657a70cd38af1a000a2dff00d397c6b44aea131a17de151463bfaee424020fac",
    "cross_cats_sorted": [
      "cs.CC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2016-03-07T01:29:25Z",
    "title_canon_sha256": "632d0884638346743f858fc52a2327ddada0cfaee27fdea27e4b50db6ec89301"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1603.01911",
    "kind": "arxiv",
    "version": 3
  }
}