Pith Number

pith:OSBXBOCC

pith:2018:OSBXBOCCAO44FY2UWDWXZQWIRB

not attested not anchored not stored refs pending

First Chern class and birational germs of Kato surfaces

Massimiliano Pontecorvo

arxiv:1809.10384 v1 · 2018-09-27 · math.DG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OSBXBOCCAO44FY2UWDWXZQWIRB}

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	2026-05-18T00:04:38.473564Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

748370b84203b9c2e354b0ed7cc2c88850db0073313d5d24aea4f33459668958

Aliases

arxiv: 1809.10384 · arxiv_version: 1809.10384v1 · doi: 10.48550/arxiv.1809.10384 · pith_short_12: OSBXBOCCAO44 · pith_short_16: OSBXBOCCAO44FY2U · pith_short_8: OSBXBOCC

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/OSBXBOCCAO44FY2UWDWXZQWIRB \
  | 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: 748370b84203b9c2e354b0ed7cc2c88850db0073313d5d24aea4f33459668958

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "555a8cbe0e8c422bf4661419b2e909e089ff213938dab92ff62a9db3dbe577ca",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2018-09-27T07:46:02Z",
    "title_canon_sha256": "a6736351366be7bb864c121776d4fe8354f1ce08ebc4f2ce9d9d97ff0830da75"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1809.10384",
    "kind": "arxiv",
    "version": 1
  }
}