Pith Number

pith:PJJNRP3R

pith:2017:PJJNRP3RXRIU5JRT4MXNTOGONH

not attested not anchored not stored refs pending

Proof-checking Euclid

Freek Wiedijk, Julien Narboux, Michael Beeson

arxiv:1710.00787 v2 · 2017-10-02 · cs.LO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PJJNRP3RXRIU5JRT4MXNTOGONH}

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	2026-05-18T00:02:49.757419Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7a52d8bf71bc514ea633e32ed9b8ce69ef240f626e5eab397b97c88faa8d6403

Aliases

arxiv: 1710.00787 · arxiv_version: 1710.00787v2 · doi: 10.48550/arxiv.1710.00787 · pith_short_12: PJJNRP3RXRIU · pith_short_16: PJJNRP3RXRIU5JRT · pith_short_8: PJJNRP3R

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/PJJNRP3RXRIU5JRT4MXNTOGONH \
  | 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: 7a52d8bf71bc514ea633e32ed9b8ce69ef240f626e5eab397b97c88faa8d6403

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bebd7a255f73da1602baa56820bb5cc149a09741b5e5a5969331a33cbaae8aaa",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2017-10-02T16:57:09Z",
    "title_canon_sha256": "50a7168ed4addde88ab572c3787f77704dd0c8aa952f33a82fe4f4716dc43e6d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1710.00787",
    "kind": "arxiv",
    "version": 2
  }
}