Pith Number

pith:DZ57E44L

pith:2018:DZ57E44LRMRKMDM3F5RVP7YEQA

not attested not anchored not stored refs pending

The language preservation problem is undecidable for parametric event-recording automata

\'Etienne Andr\'e, Shang-Wei Lin

arxiv:1812.08948 v1 · 2018-12-21 · 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{DZ57E44LRMRKMDM3F5RVP7YEQA}

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	2026-05-17T23:57:45.810121Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1e7bf2738b8b22a60d9b2f6357ff0480354a443bb2f99342549fddc011fd5878

Aliases

arxiv: 1812.08948 · arxiv_version: 1812.08948v1 · doi: 10.48550/arxiv.1812.08948 · pith_short_12: DZ57E44LRMRK · pith_short_16: DZ57E44LRMRKMDM3 · pith_short_8: DZ57E44L

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/DZ57E44LRMRKMDM3F5RVP7YEQA \
  | 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: 1e7bf2738b8b22a60d9b2f6357ff0480354a443bb2f99342549fddc011fd5878

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "86c19ac3ecc2c45712542c9d8f294aebe2c968adde08820e00a5dee0ba1ebfb6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2018-12-21T05:02:48Z",
    "title_canon_sha256": "ea1d7212608ea699beab2e415793c43123c5e754c61992a74703c49d1c0ac4f6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1812.08948",
    "kind": "arxiv",
    "version": 1
  }
}