Pith Number

pith:2SE52CPY

pith:2010:2SE52CPYNAAEAOSF7UEHQ3LXC3

not attested not anchored not stored refs pending

The Area and Population of Cities: New Insights from a Different Perspective on Cities

Diego Rybski, Hernan A. Makse, Hernan Rozenfeld, Xavier Gabaix

arxiv:1001.5289 v2 · 2010-01-28 · physics.soc-ph · cond-mat.dis-nn

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2SE52CPYNAAEAOSF7UEHQ3LXC3}

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	2026-05-18T01:18:15.565248Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d489dd09f86800403a45fd08786d7716fdbf87fcb0888d57e04e427b681d69e7

Aliases

arxiv: 1001.5289 · arxiv_version: 1001.5289v2 · doi: 10.48550/arxiv.1001.5289 · pith_short_12: 2SE52CPYNAAE · pith_short_16: 2SE52CPYNAAEAOSF · pith_short_8: 2SE52CPY

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/2SE52CPYNAAEAOSF7UEHQ3LXC3 \
  | 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: d489dd09f86800403a45fd08786d7716fdbf87fcb0888d57e04e427b681d69e7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8873bcb1285059baa276d0eecabde7e9cd7bc305e76633db3ac5bf70cdbf79de",
    "cross_cats_sorted": [
      "cond-mat.dis-nn"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.soc-ph",
    "submitted_at": "2010-01-28T23:04:07Z",
    "title_canon_sha256": "d9aa6831f5be7080a89cca098e326eb6ed9be1183c068368c39a35fedffc27f7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1001.5289",
    "kind": "arxiv",
    "version": 2
  }
}