Pith Number

pith:FAILDQ4E

pith:2015:FAILDQ4E27SGQD2HQYSBRC5R5F

not attested not anchored not stored refs pending

Guido Castelnuovo's Last Higher Geometry Lectures (1922-23)

Ciro Ciliberto, Claudio Fontanari

arxiv:1505.03009 v1 · 2015-05-12 · math.HO · math.AG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{FAILDQ4E27SGQD2HQYSBRC5R5F}

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	2026-05-18T02:14:09.311468Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2810b1c384d7e4680f478624188bb1e975bb268d2703942ce98fc0eababc13a6

Aliases

arxiv: 1505.03009 · arxiv_version: 1505.03009v1 · doi: 10.48550/arxiv.1505.03009 · pith_short_12: FAILDQ4E27SG · pith_short_16: FAILDQ4E27SGQD2H · pith_short_8: FAILDQ4E

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/FAILDQ4E27SGQD2HQYSBRC5R5F \
  | 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: 2810b1c384d7e4680f478624188bb1e975bb268d2703942ce98fc0eababc13a6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f82a8d55b2ee7748ce9e5a719f4fafdfc2427b27f1b8c24205a1502c3779e483",
    "cross_cats_sorted": [
      "math.AG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.HO",
    "submitted_at": "2015-05-12T14:00:34Z",
    "title_canon_sha256": "b70e2efb048d9216f452e74de06c0ceed9fd99f41ad86c059fc0639e1aa47843"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1505.03009",
    "kind": "arxiv",
    "version": 1
  }
}