Pith Number

pith:2UERVRVY

pith:2013:2UERVRVYPFQZW4STYSLNEE6K2E

not attested not anchored not stored refs pending

An example of a reducible Severi variety

Ilya Tyomkin

arxiv:1311.6124 v2 · 2013-11-24 · 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{2UERVRVYPFQZW4STYSLNEE6K2E}

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	2026-05-18T03:03:46.761136Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d5091ac6b879619b7253c496d213cad13b828e3956969cc346cc71c899249e7f

Aliases

arxiv: 1311.6124 · arxiv_version: 1311.6124v2 · doi: 10.48550/arxiv.1311.6124 · pith_short_12: 2UERVRVYPFQZ · pith_short_16: 2UERVRVYPFQZW4ST · pith_short_8: 2UERVRVY

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/2UERVRVYPFQZW4STYSLNEE6K2E \
  | 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: d5091ac6b879619b7253c496d213cad13b828e3956969cc346cc71c899249e7f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d635d8741c1b1a3d199b2c2a120500de795a588337a6d165994de3070b2dbb02",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2013-11-24T14:03:06Z",
    "title_canon_sha256": "023058118c969b10ea5249144e1b75e8c27f4587830b96046a0df245419413b4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1311.6124",
    "kind": "arxiv",
    "version": 2
  }
}