Pith Number

pith:PSPRHFRV

pith:2020:PSPRHFRVCU2XEN2XASQYQUDVC6

not attested not anchored not stored refs pending

Estimates of daily ground-level NO2 concentrations in China based on big data and machine learning approaches

Biqing Zhu, Cuijuan Liao, Hengqi Wang, Jianguang Tan, Nana Wu, Piyu Ke, Taochun Sun, Xiaomeng Huang, Xinyu Dou, Ying Huang, Ying Tu, Yiran Peng, Zhu Deng, Zhu Liu

arxiv:2011.09013 v1 · 2020-11-18 · physics.ao-ph · cs.LG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PSPRHFRVCU2XEN2XASQYQUDVC6}

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	2026-07-05T04:41:09.130971Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7c9f139635153572375704a188507517b89bc61889fff6f008da760b6ffbffaa

Aliases

arxiv: 2011.09013 · arxiv_version: 2011.09013v1 · doi: 10.48550/arxiv.2011.09013 · pith_short_12: PSPRHFRVCU2X · pith_short_16: PSPRHFRVCU2XEN2X · pith_short_8: PSPRHFRV

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/PSPRHFRVCU2XEN2XASQYQUDVC6 \
  | 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: 7c9f139635153572375704a188507517b89bc61889fff6f008da760b6ffbffaa

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a44aab4070b729b759c86947411b1f2850e3b3ee4cb9b67266aafcb22783630b",
    "cross_cats_sorted": [
      "cs.LG"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "physics.ao-ph",
    "submitted_at": "2020-11-18T00:24:40Z",
    "title_canon_sha256": "6aee3ac5b463baac6c3c57c300d75144feece57204eca22d32f3aa0a47ec9979"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2011.09013",
    "kind": "arxiv",
    "version": 1
  }
}