Pith Number

pith:I7Q2XWMC

pith:2013:I7Q2XWMCA2PFQPYUXTOMWTLZ4Z

not attested not anchored not stored refs pending

Friendship and Natural Selection

James H. Fowler, Nicholas A. Christakis

arxiv:1308.5257 v2 · 2013-08-23 · q-bio.GN

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{I7Q2XWMCA2PFQPYUXTOMWTLZ4Z}

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	2026-05-18T02:32:12.293282Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

47e1abd982069e583f14bcdccb4d79e650737e587fd3e6a2d5b071d9033ed593

Aliases

arxiv: 1308.5257 · arxiv_version: 1308.5257v2 · doi: 10.48550/arxiv.1308.5257 · pith_short_12: I7Q2XWMCA2PF · pith_short_16: I7Q2XWMCA2PFQPYU · pith_short_8: I7Q2XWMC

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/I7Q2XWMCA2PFQPYUXTOMWTLZ4Z \
  | 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: 47e1abd982069e583f14bcdccb4d79e650737e587fd3e6a2d5b071d9033ed593

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ec983217b6bf7cf50ca9bcd66601e5751cad11c0efea0919853c73f2f6ddf958",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "q-bio.GN",
    "submitted_at": "2013-08-23T22:28:34Z",
    "title_canon_sha256": "ddb7370b89bd27a95bb31b7e084c8d8ecff4aab328bdbc9e26e64e305d67d373"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1308.5257",
    "kind": "arxiv",
    "version": 2
  }
}