Pith Number

pith:YLH2YI5H

pith:2006:YLH2YI5HY7TT2RK7P2L2CSNDKQ

not attested not anchored not stored refs pending

On the time complexity of 2-tag systems and small universal Turing machines

Damien Woods, Turlough Neary

arxiv:cs/0612089 v1 · 2006-12-19 · cs.CC · cs.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{YLH2YI5HY7TT2RK7P2L2CSNDKQ}

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	2026-05-18T00:58:26.587788Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c2cfac23a7c7e73d455f7e97a149a35414885fdd68bff2b830ced4d144c02dd1

Aliases

arxiv: cs/0612089 · arxiv_version: cs/0612089v1 · doi: 10.48550/arxiv.cs/0612089 · pith_short_12: YLH2YI5HY7TT · pith_short_16: YLH2YI5HY7TT2RK7 · pith_short_8: YLH2YI5H

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/YLH2YI5HY7TT2RK7P2L2CSNDKQ \
  | 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: c2cfac23a7c7e73d455f7e97a149a35414885fdd68bff2b830ced4d144c02dd1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7299785a9e0eaedbb6c4cb3489b2d5f8e42c6e3b9849678b232286c12c95e9b4",
    "cross_cats_sorted": [
      "cs.DS"
    ],
    "license": "",
    "primary_cat": "cs.CC",
    "submitted_at": "2006-12-19T15:59:45Z",
    "title_canon_sha256": "ee663207ff408d6bac9b221b955260a72475e154c660ed6fd47146de737de834"
  },
  "schema_version": "1.0",
  "source": {
    "id": "cs/0612089",
    "kind": "arxiv",
    "version": 1
  }
}