Pith Number

pith:POQUD4FZ

pith:2016:POQUD4FZWXGYYJYQSDDKXFS5GI

not attested not anchored not stored refs pending

The Undecidability of Arbitrary Arrow Update Logic

Hans van Ditmarsch, Louwe B. Kuijer, Wiebe van der Hoek

arxiv:1609.05686 v1 · 2016-09-19 · 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{POQUD4FZWXGYYJYQSDDKXFS5GI}

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	2026-05-18T01:04:25.647099Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7ba141f0b9b5cd8c271090c6ab965d32371eddf3eef9f2d111af64518fc5e17e

Aliases

arxiv: 1609.05686 · arxiv_version: 1609.05686v1 · doi: 10.48550/arxiv.1609.05686 · pith_short_12: POQUD4FZWXGY · pith_short_16: POQUD4FZWXGYYJYQ · pith_short_8: POQUD4FZ

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/POQUD4FZWXGYYJYQSDDKXFS5GI \
  | 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: 7ba141f0b9b5cd8c271090c6ab965d32371eddf3eef9f2d111af64518fc5e17e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "61e400655bdd5beece5f7c87b2eb53a87c4cd57ad5e8cb3910a9775d9b829185",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2016-09-19T12:27:01Z",
    "title_canon_sha256": "b00f5bb8a55c13f4412839445dfd92858c079416a4f28fbe06275ab52fd510e0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1609.05686",
    "kind": "arxiv",
    "version": 1
  }
}