Pith Number

pith:MV7SOQDI

pith:2018:MV7SOQDIG7L2WKPDCXOCWK3A4T

not attested not anchored not stored refs pending

Complex Economic Activities Concentrate in Large Cities

Cesar A. Hidalgo, Cristian Jara-Figueroa, David Rigby, Mathieu Steijn, Pierre-Alexandre Balland, Sergio Petralia

arxiv:1807.07887 v1 · 2018-07-20 · physics.soc-ph · 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{MV7SOQDIG7L2WKPDCXOCWK3A4T}

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	2026-05-18T00:10:15.373229Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

657f27406837d7ab29e315dc2b2b60e4d33257237f5ed1a483d450b27752a6d7

Aliases

arxiv: 1807.07887 · arxiv_version: 1807.07887v1 · doi: 10.48550/arxiv.1807.07887 · pith_short_12: MV7SOQDIG7L2 · pith_short_16: MV7SOQDIG7L2WKPD · pith_short_8: MV7SOQDI

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/MV7SOQDIG7L2WKPDCXOCWK3A4T \
  | 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: 657f27406837d7ab29e315dc2b2b60e4d33257237f5ed1a483d450b27752a6d7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b1dcfd9037b1d651e1bb5bdcc2890813874ad7378d34d675f4a5a3926c6fa82a",
    "cross_cats_sorted": [
      "cs.SI"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.soc-ph",
    "submitted_at": "2018-07-20T15:17:40Z",
    "title_canon_sha256": "68a3d310766b6c1343179ada01aacc458fcbcd7f02dfef66dff9253a845d8ed3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1807.07887",
    "kind": "arxiv",
    "version": 1
  }
}