Pith Number

pith:QB6N5L3A

pith:2011:QB6N5L3AFTYO3LPUOMXLK2DBFM

not attested not anchored not stored refs pending

Unpredictability and Computational Irreducibility

Herve Zwirn, Jean-Paul Delahaye

arxiv:1111.4121 v2 · 2011-11-17 · cs.CC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QB6N5L3AFTYO3LPUOMXLK2DBFM}

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	2026-05-18T04:03:08.864042Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

807cdeaf602cf0edadf4732eb568612b3f6956cf6080a50ab749d07138e19e88

Aliases

arxiv: 1111.4121 · arxiv_version: 1111.4121v2 · doi: 10.48550/arxiv.1111.4121 · pith_short_12: QB6N5L3AFTYO · pith_short_16: QB6N5L3AFTYO3LPU · pith_short_8: QB6N5L3A

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/QB6N5L3AFTYO3LPUOMXLK2DBFM \
  | 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: 807cdeaf602cf0edadf4732eb568612b3f6956cf6080a50ab749d07138e19e88

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d5ad4fb0303b7b3d53d864ebe42ccfd8af4a6941b1b9204a5bd5b2fc1c3393e0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2011-11-17T15:01:44Z",
    "title_canon_sha256": "c547cbf960b1e2ca457e212f491f717ba9ef6080cd6a7c27e006478657fa5c29"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1111.4121",
    "kind": "arxiv",
    "version": 2
  }
}