Pith Number

pith:QNFZKF5G

pith:2011:QNFZKF5GO6VIPOWNKIE7QLOTHN

not attested not anchored not stored refs pending

Common Knowledge in Email Exchanges

Floor Sietsma, Krzysztof R. Apt

arxiv:1109.3322 v2 · 2011-09-15 · cs.LO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QNFZKF5GO6VIPOWNKIE7QLOTHN}

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	2026-05-18T03:40:03.353655Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

834b9517a677aa87bacd5209f82dd33b74845654f0b640be00a4b5affdb9f42e

Aliases

arxiv: 1109.3322 · arxiv_version: 1109.3322v2 · doi: 10.48550/arxiv.1109.3322 · pith_short_12: QNFZKF5GO6VI · pith_short_16: QNFZKF5GO6VIPOWN · pith_short_8: QNFZKF5G

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/QNFZKF5GO6VIPOWNKIE7QLOTHN \
  | 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: 834b9517a677aa87bacd5209f82dd33b74845654f0b640be00a4b5affdb9f42e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "66127c9fa6245291dc0822f5cf0f0ad5189e535501a17688c0feb25011d6ee12",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2011-09-15T11:52:55Z",
    "title_canon_sha256": "f5efa47324e59e57a2096f14321238bfd7a8e1ba29d54fe0e15abf2f32b76530"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1109.3322",
    "kind": "arxiv",
    "version": 2
  }
}