Pith Number

pith:7HFFK3NJ

pith:2010:7HFFK3NJUSDRP72LNZEGIMSRDF

not attested not anchored not stored refs pending

Infinite Time Cellular Automata: A Real Computation Model

Fabien Givors (LIF), Gr\'egory Lafitte (LIF), Nicolas Ollinger (LIF)

arxiv:1012.1221 v1 · 2010-12-03 · nlin.CG · cs.CC · 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{7HFFK3NJUSDRP72LNZEGIMSRDF}

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	2026-05-18T04:34:01.693092Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f9ca556da9a48717ff4b6e4864325119550e276a993848cc9c2344b28e3dcef2

Aliases

arxiv: 1012.1221 · arxiv_version: 1012.1221v1 · doi: 10.48550/arxiv.1012.1221 · pith_short_12: 7HFFK3NJUSDR · pith_short_16: 7HFFK3NJUSDRP72L · pith_short_8: 7HFFK3NJ

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/7HFFK3NJUSDRP72LNZEGIMSRDF \
  | 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: f9ca556da9a48717ff4b6e4864325119550e276a993848cc9c2344b28e3dcef2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "604f6bdb73f7db36a7ef71c3233003d4043b46daad390f20b78f388ced7adbb0",
    "cross_cats_sorted": [
      "cs.CC",
      "cs.LO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "nlin.CG",
    "submitted_at": "2010-12-03T09:57:11Z",
    "title_canon_sha256": "7072f843c3d1945fdeb739f92a3ac21d27f189609b736f99e9054ce0e8393d62"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1012.1221",
    "kind": "arxiv",
    "version": 1
  }
}