Pith Number

pith:6SFS6IQN

pith:2015:6SFS6IQNOT3OVIBSXIP452Q63T

not attested not anchored not stored refs pending

An NL-Complete Puzzle

Holger Petersen

arxiv:1507.02723 v1 · 2015-07-09 · 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{6SFS6IQNOT3OVIBSXIP452Q63T}

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	2026-05-18T01:37:03.351984Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f48b2f220d74f6eaa032ba1fceea1edccee8f4685aea06537ad10636eb1549f2

Aliases

arxiv: 1507.02723 · arxiv_version: 1507.02723v1 · doi: 10.48550/arxiv.1507.02723 · pith_short_12: 6SFS6IQNOT3O · pith_short_16: 6SFS6IQNOT3OVIBS · pith_short_8: 6SFS6IQN

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/6SFS6IQNOT3OVIBSXIP452Q63T \
  | 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: f48b2f220d74f6eaa032ba1fceea1edccee8f4685aea06537ad10636eb1549f2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "40e0a6dd5e7686602ab788c11c0578631400f5c9f54cfe5558f8f98de4d79b6c",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2015-07-09T22:03:56Z",
    "title_canon_sha256": "6a9d24c8d71d89c45875b27c7bae5e28312b0a275fa7f8010a2430763812f774"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1507.02723",
    "kind": "arxiv",
    "version": 1
  }
}