Pith Number

pith:BSJ2EH3B

pith:2019:BSJ2EH3BFPU5E7D4FRWYBPTI6D

not attested not anchored not stored refs pending

Graphs derived from perfect difference sets

Grahame Erskine, Jozef \v{S}ir\'a\v{n}, Peter Fratri\v{c}

arxiv:1903.02425 v1 · 2019-03-06 · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{BSJ2EH3BFPU5E7D4FRWYBPTI6D}

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	2026-05-17T23:51:55.351755Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0c93a21f612be9d27c7c2c6d80be68f0c2663125314c805289c29597b9d8a163

Aliases

arxiv: 1903.02425 · arxiv_version: 1903.02425v1 · doi: 10.48550/arxiv.1903.02425 · pith_short_12: BSJ2EH3BFPU5 · pith_short_16: BSJ2EH3BFPU5E7D4 · pith_short_8: BSJ2EH3B

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/BSJ2EH3BFPU5E7D4FRWYBPTI6D \
  | 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: 0c93a21f612be9d27c7c2c6d80be68f0c2663125314c805289c29597b9d8a163

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e600b7beac90cb277b0c5a51710c1d0c7a1ef8dfd4802d6a9498a1f4ccee1195",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2019-03-06T14:46:21Z",
    "title_canon_sha256": "139fee89af5191c786c1af283671285532eed946bb4a584c44eddd705b87b631"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.02425",
    "kind": "arxiv",
    "version": 1
  }
}