Pith Number

pith:EBTEGCHA

pith:2016:EBTEGCHAQLMHTQF4UASPN2VR75

not attested not anchored not stored refs pending

The Complexity of Rummikub Problems

Frank W. Takes, Jan N. van Rijn, Jonathan K. Vis

arxiv:1604.07553 v1 · 2016-04-26 · 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{EBTEGCHAQLMHTQF4UASPN2VR75}

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	2026-05-18T01:16:19.526215Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

20664308e082d879c0bca024f6eab1ff4f8de0dc7e8e6bbcae857d109c34d6f8

Aliases

arxiv: 1604.07553 · arxiv_version: 1604.07553v1 · doi: 10.48550/arxiv.1604.07553 · pith_short_12: EBTEGCHAQLMH · pith_short_16: EBTEGCHAQLMHTQF4 · pith_short_8: EBTEGCHA

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/EBTEGCHAQLMHTQF4UASPN2VR75 \
  | 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: 20664308e082d879c0bca024f6eab1ff4f8de0dc7e8e6bbcae857d109c34d6f8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5c4d1031e40ae272bad6d2817e7924f74e4843d5cdd1349092e5fd97c902907f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2016-04-26T07:40:16Z",
    "title_canon_sha256": "8caf8a8f613b2675cec43572b1f42fdf73d08306f26be2f11e798c1cd9f9b3ad"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1604.07553",
    "kind": "arxiv",
    "version": 1
  }
}