Pith Number

pith:BT2AZ7GP

pith:2018:BT2AZ7GP4O6VWSRYQR2PL4QDCX

not attested not anchored not stored refs pending

Generalized dunce hats are not splittable

Fredric Ancel, Pete Sparks

arxiv:1803.00644 v1 · 2018-03-01 · math.GT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{BT2AZ7GP4O6VWSRYQR2PL4QDCX}

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	2026-05-18T00:22:08.293490Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0cf40cfccfe3bd5b4a388474f5f20315df6469ce107b4d5f882e6c3ade2b7b1e

Aliases

arxiv: 1803.00644 · arxiv_version: 1803.00644v1 · doi: 10.48550/arxiv.1803.00644 · pith_short_12: BT2AZ7GP4O6V · pith_short_16: BT2AZ7GP4O6VWSRY · pith_short_8: BT2AZ7GP

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/BT2AZ7GP4O6VWSRYQR2PL4QDCX \
  | 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: 0cf40cfccfe3bd5b4a388474f5f20315df6469ce107b4d5f882e6c3ade2b7b1e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5b0b4f85edbcd9c0c6788422a3f7db614b6717302d2a44e77f006be762db776b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GT",
    "submitted_at": "2018-03-01T21:56:26Z",
    "title_canon_sha256": "09b9757fa6dfbaf5b0a1ed84811db6ddd032da2c3320c026350263c453f086fd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1803.00644",
    "kind": "arxiv",
    "version": 1
  }
}