Pith Number

pith:6UG5VMCM

pith:2026:6UG5VMCMDIOOATOCLFP7IPQKEU

not attested not anchored not stored refs pending

A Novel Urban Flood Dynamical System Model and a Corresponding Nonstandard Finite Difference Method

Guofeng Su, Jianguo Chen, Shan Ding, Yongfu Tian

arxiv:2605.18785 v1 · 2026-05-07 · physics.soc-ph · cs.SY · eess.SY

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{6UG5VMCMDIOOATOCLFP7IPQKEU}

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	2026-05-20T00:06:22.152955Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f50ddab04c1a1ce04dc2595ff43e0a2523ad75581bf2bb20357c6e82e3122556

Aliases

arxiv: 2605.18785 · arxiv_version: 2605.18785v1 · doi: 10.48550/arxiv.2605.18785 · pith_short_12: 6UG5VMCMDIOO · pith_short_16: 6UG5VMCMDIOOATOC · pith_short_8: 6UG5VMCM

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/6UG5VMCMDIOOATOCLFP7IPQKEU \
  | 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: f50ddab04c1a1ce04dc2595ff43e0a2523ad75581bf2bb20357c6e82e3122556

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9a2976aa6b7e73721bd9052cba285c8c8e53a3acd84381113cf8f24bc75f6b05",
    "cross_cats_sorted": [
      "cs.SY",
      "eess.SY"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.soc-ph",
    "submitted_at": "2026-05-07T07:15:36Z",
    "title_canon_sha256": "e8da1178650d2bc05ea2fe4b2bd1db62c1102b3a7a145aa224390db7ceedf4e9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.18785",
    "kind": "arxiv",
    "version": 1
  }
}