Pith Number

pith:CPO4GZLJ

pith:2025:CPO4GZLJKFYU3XMRCR6O6A274O

not attested not anchored not stored refs pending

AirCalypse: Can Twitter Help in Urban Air Quality Measurement and Who are the Influential Users?

Mousumi Saha, Prithviraj Pramanik, Subrata Nandi, Tamal Mondal

arxiv:2502.19421 v1 · 2025-01-25 · physics.soc-ph · cs.CY · cs.SI

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{CPO4GZLJKFYU3XMRCR6O6A274O}

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	2026-07-05T10:20:45.956259Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

13ddc3656951714ddd91147cef035fe3bede2338e5b7eb5932113c8c6f3fae65

Aliases

arxiv: 2502.19421 · arxiv_version: 2502.19421v1 · doi: 10.48550/arxiv.2502.19421 · pith_short_12: CPO4GZLJKFYU · pith_short_16: CPO4GZLJKFYU3XMR · pith_short_8: CPO4GZLJ

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/CPO4GZLJKFYU3XMRCR6O6A274O \
  | 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: 13ddc3656951714ddd91147cef035fe3bede2338e5b7eb5932113c8c6f3fae65

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "eb514ae06c39579202aab435d56b0f1b5b122d8bd47291a728f615d045ac7dfa",
    "cross_cats_sorted": [
      "cs.CY",
      "cs.SI"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "physics.soc-ph",
    "submitted_at": "2025-01-25T11:13:15Z",
    "title_canon_sha256": "63fecca3f01b2416410a936a21d8964401fdf127a5dbd48bb734c163c8b0b551"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2502.19421",
    "kind": "arxiv",
    "version": 1
  }
}