Pith Number

pith:ZSNJ6EQX

pith:2019:ZSNJ6EQXMAREQNRV63TZP6BSFC

not attested not anchored not stored refs pending

FHCP Challenge Set: The First Set of Structurally Difficult Instances of the Hamiltonian Cycle Problem

Michael Haythorpe

arxiv:1902.10352 v1 · 2019-02-27 · math.CO · cs.DM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ZSNJ6EQXMAREQNRV63TZP6BSFC}

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	2026-05-17T23:52:31.094432Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cc9a9f12176022483635f6e797f832288d7a2bd3f92731761e40b6e3f53daabf

Aliases

arxiv: 1902.10352 · arxiv_version: 1902.10352v1 · doi: 10.48550/arxiv.1902.10352 · pith_short_12: ZSNJ6EQXMARE · pith_short_16: ZSNJ6EQXMAREQNRV · pith_short_8: ZSNJ6EQX

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/ZSNJ6EQXMAREQNRV63TZP6BSFC \
  | 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: cc9a9f12176022483635f6e797f832288d7a2bd3f92731761e40b6e3f53daabf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3c60b182b4e5eb8f48e4851ca20d9150466c2fbdcc5a33fe1a7b45ae43ba8966",
    "cross_cats_sorted": [
      "cs.DM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2019-02-27T06:30:51Z",
    "title_canon_sha256": "ad17ea5925f3b0e792f1cb79392534aadb930ee966234d49d9240a8d554fbf7c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.10352",
    "kind": "arxiv",
    "version": 1
  }
}