Pith Number

pith:U5PLFTRK

pith:2011:U5PLFTRKJIBFJRIUKT3PKEMAD5

not attested not anchored not stored refs pending

The complexity of small universal Turing machines: a survey

Damien Woods, Turlough Neary

arxiv:1110.2230 v1 · 2011-10-10 · 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{U5PLFTRKJIBFJRIUKT3PKEMAD5}

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	2026-05-18T04:11:17.303536Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a75eb2ce2a4a0254c51454f6f511801f73e4464f616a1272fe408c88984d3294

Aliases

arxiv: 1110.2230 · arxiv_version: 1110.2230v1 · doi: 10.48550/arxiv.1110.2230 · pith_short_12: U5PLFTRKJIBF · pith_short_16: U5PLFTRKJIBFJRIU · pith_short_8: U5PLFTRK

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/U5PLFTRKJIBFJRIUKT3PKEMAD5 \
  | 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: a75eb2ce2a4a0254c51454f6f511801f73e4464f616a1272fe408c88984d3294

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a7474bd3d80b604ab98b870da58a7a6e45f28dc922907b625a54bad0e3ed1410",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2011-10-10T23:22:17Z",
    "title_canon_sha256": "bf8ffcab5256d2ed84e9ee9567cf10de77dcdf82e5656454b2c6160d673a40d8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1110.2230",
    "kind": "arxiv",
    "version": 1
  }
}