Pith Number

pith:ALX7WMKM

pith:2012:ALX7WMKM3H22M6ZNOOSBKY5UI4

not attested not anchored not stored refs pending

The evolution of cooperation by social exclusion

Satoshi Uchida, Tatsuya Sasaki

arxiv:1211.2838 v2 · 2012-11-12 · physics.soc-ph · cs.SI · nlin.AO · q-bio.PE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ALX7WMKM3H22M6ZNOOSBKY5UI4}

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	2026-05-18T03:39:04.726325Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

02effb314cd9f5a67b2d73a41563b4472b8865d02e2a0e5866743679cfbcbb9d

Aliases

arxiv: 1211.2838 · arxiv_version: 1211.2838v2 · doi: 10.48550/arxiv.1211.2838 · pith_short_12: ALX7WMKM3H22 · pith_short_16: ALX7WMKM3H22M6ZN · pith_short_8: ALX7WMKM

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/ALX7WMKM3H22M6ZNOOSBKY5UI4 \
  | 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: 02effb314cd9f5a67b2d73a41563b4472b8865d02e2a0e5866743679cfbcbb9d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "16493e48ff8356419e51d9684a58b36016e48df8f222fd44c5d5229303cfb162",
    "cross_cats_sorted": [
      "cs.SI",
      "nlin.AO",
      "q-bio.PE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.soc-ph",
    "submitted_at": "2012-11-12T21:36:50Z",
    "title_canon_sha256": "8c08d11babde413707b8ff1426d68142eec0f19ce568fa45c2be86fdeb4f606d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1211.2838",
    "kind": "arxiv",
    "version": 2
  }
}