Pith Number

pith:I5RB7V3U

pith:2017:I5RB7V3UBVCXTW6WR5UAWOVV4I

not attested not anchored not stored refs pending

Push-Pull Block Puzzles are Hard

Erik D. Demaine, Isaac Grosof, Jayson Lynch

arxiv:1709.01241 v1 · 2017-09-05 · 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{I5RB7V3UBVCXTW6WR5UAWOVV4I}

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	2026-05-18T00:36:00.581683Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

47621fd7740d4579dbd68f680b3ab5e2034da9146c4c30f32d84fd15d66ea47a

Aliases

arxiv: 1709.01241 · arxiv_version: 1709.01241v1 · doi: 10.48550/arxiv.1709.01241 · pith_short_12: I5RB7V3UBVCX · pith_short_16: I5RB7V3UBVCXTW6W · pith_short_8: I5RB7V3U

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/I5RB7V3UBVCXTW6WR5UAWOVV4I \
  | 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: 47621fd7740d4579dbd68f680b3ab5e2034da9146c4c30f32d84fd15d66ea47a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0aaf63f9b1af7c525d235bf9584aeda0a2f8a7e51e625254acb990af05b6a23f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2017-09-05T05:42:05Z",
    "title_canon_sha256": "e3634f86f114db8b1ba6092c20a243c12c3b1b053e1bb4094bcf5218557f3297"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1709.01241",
    "kind": "arxiv",
    "version": 1
  }
}