Pith Number

pith:4YVJ7BYD

pith:2026:4YVJ7BYDZQHXJBTPXSTVLVM4KR

not attested not anchored not stored refs pending

Quoridor is PSPACE-Hard

Benjamin G. Rin, Finn van der Velde, Marius Drop

arxiv:2605.22747 v1 · 2026-05-21 · 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{4YVJ7BYDZQHXJBTPXSTVLVM4KR}

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	2026-05-22T02:04:53.052805Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e62a9f8703cc0f74866fbca755d59c5447ee04e62b19f41a74908f760592f3c4

Aliases

arxiv: 2605.22747 · arxiv_version: 2605.22747v1 · doi: 10.48550/arxiv.2605.22747 · pith_short_12: 4YVJ7BYDZQHX · pith_short_16: 4YVJ7BYDZQHXJBTP · pith_short_8: 4YVJ7BYD

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/4YVJ7BYDZQHXJBTPXSTVLVM4KR \
  | 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: e62a9f8703cc0f74866fbca755d59c5447ee04e62b19f41a74908f760592f3c4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "99c75508dcb99ab9b3712ef03116dcc883dc38b3021ad17cb826bab3d78fc813",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2026-05-21T17:15:28Z",
    "title_canon_sha256": "fe8b2868f04feb0b6a2818a9ef0428a3fde4a01306a7a7405ad270fe6af1f18f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.22747",
    "kind": "arxiv",
    "version": 1
  }
}