Pith Number

pith:OAPU5TGT

pith:2012:OAPU5TGTCQTICYZL7EZ7XV72ZX

not attested not anchored not stored refs pending

Are insight problems really different from noninsight problems?

Matthijs Melissen

arxiv:1205.0528 v2 · 2012-05-01 · q-bio.NC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OAPU5TGTCQTICYZL7EZ7XV72ZX}

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	2026-05-18T03:56:33.665907Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

701f4eccd3142681632bf933fbd7facdd3f629c6ddc7a4b28f79d14baf8879b0

Aliases

arxiv: 1205.0528 · arxiv_version: 1205.0528v2 · doi: 10.48550/arxiv.1205.0528 · pith_short_12: OAPU5TGTCQTI · pith_short_16: OAPU5TGTCQTICYZL · pith_short_8: OAPU5TGT

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/OAPU5TGTCQTICYZL7EZ7XV72ZX \
  | 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: 701f4eccd3142681632bf933fbd7facdd3f629c6ddc7a4b28f79d14baf8879b0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5683260e484815c1a13259ad3162b34ef75ae6bb7207ccfd5c22c24b1e122298",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "q-bio.NC",
    "submitted_at": "2012-05-01T12:15:03Z",
    "title_canon_sha256": "18a950f810f91f2f46e45b1c60c84a60f01ad47f8a1f285d14580485e245b81b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1205.0528",
    "kind": "arxiv",
    "version": 2
  }
}