Pith Number

pith:PQPQWMVX

pith:2004:PQPQWMVX6OMSFTUGIHYKLHHSAR

not attested not anchored not stored refs pending

A model of sympatric speciation through assortative mating

Carlo Guardiani, Franco Bagnoli

arxiv:q-bio/0402038 v2 · 2004-02-18 · 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{PQPQWMVX6OMSFTUGIHYKLHHSAR}

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	2026-07-04T14:48:03.454493Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7c1f0b32b7f39922ce8641f0a59cf2046f13cc919a5b66aff612d1c177c61f46

Aliases

arxiv: q-bio/0402038 · arxiv_version: q-bio/0402038v2 · doi: 10.48550/arxiv.q-bio/0402038 · pith_short_12: PQPQWMVX6OMS · pith_short_16: PQPQWMVX6OMSFTUG · pith_short_8: PQPQWMVX

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/PQPQWMVX6OMSFTUGIHYKLHHSAR \
  | 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: 7c1f0b32b7f39922ce8641f0a59cf2046f13cc919a5b66aff612d1c177c61f46

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a695a4ff638726002070184e12cc6e68dfd6e62bb223f02fd4e65c325b4c9ea4",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "q-bio.PE",
    "submitted_at": "2004-02-18T18:23:55Z",
    "title_canon_sha256": "db64cc4d1df5b4877aeac7333bb546919a9c1e4b12e77b2ffb1253def17b894a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "q-bio/0402038",
    "kind": "arxiv",
    "version": 2
  }
}