Pith Number

pith:BZT2S7QB

pith:2021:BZT2S7QBOFLMLV73LZXB3UBQB5

not attested not anchored not stored refs pending

A note on hyperopic cops and robber

Amanda Porter, Margaret-Ellen Messinger, Nancy E. Clarke, Stephen Finbow

arxiv:2107.07368 v1 · 2021-07-15 · 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{BZT2S7QBOFLMLV73LZXB3UBQB5}

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	2026-07-05T02:58:13.677064Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0e67a97e017156c5d7fb5e6e1dd0300f600e2a5dbc231b1dd3a49d1810550626

Aliases

arxiv: 2107.07368 · arxiv_version: 2107.07368v1 · doi: 10.48550/arxiv.2107.07368 · pith_short_12: BZT2S7QBOFLM · pith_short_16: BZT2S7QBOFLMLV73 · pith_short_8: BZT2S7QB

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/BZT2S7QBOFLMLV73LZXB3UBQB5 \
  | 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: 0e67a97e017156c5d7fb5e6e1dd0300f600e2a5dbc231b1dd3a49d1810550626

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a802b53cf198afcc1c7a50e5ea0e2004237d0d603b89ab311afd5caa93a618b7",
    "cross_cats_sorted": [
      "cs.DM"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2021-07-15T14:48:06Z",
    "title_canon_sha256": "60819bdb073d53f069d1a7005fbdf153cf6981c4b8d370f70e0178d2d944dbad"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2107.07368",
    "kind": "arxiv",
    "version": 1
  }
}