Pith Number

pith:W25CNZGA

pith:2013:W25CNZGA3CH2DE2MNF4LGI4XXH

not attested not anchored not stored refs pending

Quartic del Pezzo surfaces over function fields of curves

Brendan Hassett, Yuri Tschinkel

arxiv:1301.7270 v1 · 2013-01-30 · 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{W25CNZGA3CH2DE2MNF4LGI4XXH}

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	2026-05-18T03:35:00.761573Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b6ba26e4c0d88fa1934c6978b32397b9c4cf37ec87f33fab69819b02fb6cc655

Aliases

arxiv: 1301.7270 · arxiv_version: 1301.7270v1 · doi: 10.48550/arxiv.1301.7270 · pith_short_12: W25CNZGA3CH2 · pith_short_16: W25CNZGA3CH2DE2M · pith_short_8: W25CNZGA

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/W25CNZGA3CH2DE2MNF4LGI4XXH \
  | 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: b6ba26e4c0d88fa1934c6978b32397b9c4cf37ec87f33fab69819b02fb6cc655

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "80c0f1116e88a8869bb80bd6ec971fb57842f76fca57bc80a8126404d68a3236",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2013-01-30T16:05:53Z",
    "title_canon_sha256": "6a551ea6c105b0b3ed3ea9ef6c9763c35c871206ebd6ae7bd6f9d7dbdec5f62b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1301.7270",
    "kind": "arxiv",
    "version": 1
  }
}