Pith Number

pith:4R4RPDJF

pith:2015:4R4RPDJFPIPXHCVO6OJR7X637Q

not attested not anchored not stored refs pending

The amenity space and the evolution of neighborhoods

C\'esar A. Hidalgo, Elisa E. Casta\~ner

arxiv:1509.02868 v2 · 2015-09-09 · physics.soc-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4R4RPDJFPIPXHCVO6OJR7X637Q}

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	2026-05-18T01:10:45.896356Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e479178d257a1f738aaef3931fdfdbfc03d63e3e38111d757c3af4c05d1c6e88

Aliases

arxiv: 1509.02868 · arxiv_version: 1509.02868v2 · doi: 10.48550/arxiv.1509.02868 · pith_short_12: 4R4RPDJFPIPX · pith_short_16: 4R4RPDJFPIPXHCVO · pith_short_8: 4R4RPDJF

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/4R4RPDJFPIPXHCVO6OJR7X637Q \
  | 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: e479178d257a1f738aaef3931fdfdbfc03d63e3e38111d757c3af4c05d1c6e88

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8d4d4e7e3be024b1382ff8cddd96ff7e2974b330442287db2460ca4781e9fa87",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.soc-ph",
    "submitted_at": "2015-09-09T17:50:35Z",
    "title_canon_sha256": "f75b3a54513ac1d34d557d13808088d903b13a6241dfa205c823bb58dc6b62cc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1509.02868",
    "kind": "arxiv",
    "version": 2
  }
}