Pith Number

pith:A5KVAJMS

pith:2009:A5KVAJMSN3Q34A5XHXPI2GFBFR

not attested not anchored not stored refs pending

To cooperate or to defect? Altruism and reputation

Krzysztof Kulakowski, Przemyslaw Gawronski

arxiv:0902.4451 v1 · 2009-02-25 · 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{A5KVAJMSN3Q34A5XHXPI2GFBFR}

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	2026-05-18T02:14:38.910143Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

07555025926ee1be03b73dde8d18a12c50956ce365a3304dccc59a1ac7a1bb73

Aliases

arxiv: 0902.4451 · arxiv_version: 0902.4451v1 · doi: 10.48550/arxiv.0902.4451 · pith_short_12: A5KVAJMSN3Q3 · pith_short_16: A5KVAJMSN3Q34A5X · pith_short_8: A5KVAJMS

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/A5KVAJMSN3Q34A5XHXPI2GFBFR \
  | 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: 07555025926ee1be03b73dde8d18a12c50956ce365a3304dccc59a1ac7a1bb73

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d7e23f9584e09c3ffdf8c9ad90174db131d992a268f3678dbd70de931f9c319b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.soc-ph",
    "submitted_at": "2009-02-25T19:30:17Z",
    "title_canon_sha256": "b9349a6c2370150215cf278399c19612dcc23091744040a77783426cd5e9d4f1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0902.4451",
    "kind": "arxiv",
    "version": 1
  }
}