Pith Number

pith:NZTT6VYS

pith:2018:NZTT6VYSEQKXJG7DNJ6OXOSEWA

not attested not anchored not stored refs pending

Losing at Checkers is Hard

(2) Department of Electrical, Computer Engineering, Erik D. Demaine (1), Jayson Lynch (1) ((1) MIT CSAIL, Jeffrey Bosboom (1), Martin L. Demaine (1), San Diego), Spencer Congero (2), University of California

arxiv:1806.05657 v1 · 2018-06-14 · 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{NZTT6VYSEQKXJG7DNJ6OXOSEWA}

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	2026-05-18T00:13:14.434608Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6e673f57122415749be36a7cebba44b01740276c2a7e8ffbef96430627bb5139

Aliases

arxiv: 1806.05657 · arxiv_version: 1806.05657v1 · doi: 10.48550/arxiv.1806.05657 · pith_short_12: NZTT6VYSEQKX · pith_short_16: NZTT6VYSEQKXJG7D · pith_short_8: NZTT6VYS

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/NZTT6VYSEQKXJG7DNJ6OXOSEWA \
  | 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: 6e673f57122415749be36a7cebba44b01740276c2a7e8ffbef96430627bb5139

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bf5f914be5c2a184c03154116aa074a9299533b3697c3ed58a6e44589a3a7c9f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2018-06-14T17:28:51Z",
    "title_canon_sha256": "5161fdef247c9f94fcb3b500dba4b6b1deff7cfce5a80c547c99b5a17dfe9744"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1806.05657",
    "kind": "arxiv",
    "version": 1
  }
}