Pith Number

pith:JDDEZGAG

pith:2022:JDDEZGAG7YOMFQPCT6L3FPSWNP

not attested not anchored not stored refs pending

Constructive Many-one Reduction from the Halting Problem to Semi-unification (Extended Version)

Andrej Dudenhefner

arxiv:2208.13428 v5 · 2022-08-29 · 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{JDDEZGAG7YOMFQPCT6L3FPSWNP}

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	2026-07-05T07:44:40.529091Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

48c64c9806fe1cc2c1e29f97b2be566bc3c95af4ce205f984a88157414a9cbc0

Aliases

arxiv: 2208.13428 · arxiv_version: 2208.13428v5 · doi: 10.48550/arxiv.2208.13428 · pith_short_12: JDDEZGAG7YOM · pith_short_16: JDDEZGAG7YOMFQPC · pith_short_8: JDDEZGAG

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/JDDEZGAG7YOMFQPCT6L3FPSWNP \
  | 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: 48c64c9806fe1cc2c1e29f97b2be566bc3c95af4ce205f984a88157414a9cbc0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "805b454d1a376023d284c8338422b9eef3b804aafea9e648c0cb79050f5f4bf0",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2022-08-29T08:52:21Z",
    "title_canon_sha256": "b1ebe9d0e5d739eefc13175b77caa4a32ef54446ed91188aa4fc087f56eadc69"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2208.13428",
    "kind": "arxiv",
    "version": 5
  }
}