Pith Number

pith:5MWV5ICK

pith:2019:5MWV5ICKBZMN3MK5Y4XWQRGCUZ

not attested not anchored not stored refs pending

On the Density of Languages Accepted by Turing Machines and Other Machine Models

Ian McQuillan, Oscar H. Ibarra

arxiv:1903.03018 v1 · 2019-03-07 · cs.FL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{5MWV5ICKBZMN3MK5Y4XWQRGCUZ}

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	2026-05-17T23:51:50.388500Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

eb2d5ea04a0e58ddb15dc72f6844c2a66102dcf91b5dfaaca21afdd12407c6c2

Aliases

arxiv: 1903.03018 · arxiv_version: 1903.03018v1 · doi: 10.48550/arxiv.1903.03018 · pith_short_12: 5MWV5ICKBZMN · pith_short_16: 5MWV5ICKBZMN3MK5 · pith_short_8: 5MWV5ICK

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/5MWV5ICKBZMN3MK5Y4XWQRGCUZ \
  | 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: eb2d5ea04a0e58ddb15dc72f6844c2a66102dcf91b5dfaaca21afdd12407c6c2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4ccb89d3a914f220fba908a706c9cb67b9994726a71506a9d7522f616e4a7065",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2019-03-07T16:10:24Z",
    "title_canon_sha256": "c8790b3a7b6c80763b1a19e18fba9032581f33ab9abf62a53195529a6ba86c9b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.03018",
    "kind": "arxiv",
    "version": 1
  }
}