Pith Number

pith:SGSCNZ2T

pith:2015:SGSCNZ2T3ZWHAZ2JTPVKMZ6EUE

not attested not anchored not stored refs pending

Minsky machines and algorithmic problems

Mark Sapir

arxiv:1504.07736 v1 · 2015-04-29 · math.GR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SGSCNZ2T3ZWHAZ2JTPVKMZ6EUE}

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	2026-05-18T02:17:32.392662Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

91a426e753de6c7067499beaa667c4a127eaed6bbcc416fd07260d2eaae3afc8

Aliases

arxiv: 1504.07736 · arxiv_version: 1504.07736v1 · doi: 10.48550/arxiv.1504.07736 · pith_short_12: SGSCNZ2T3ZWH · pith_short_16: SGSCNZ2T3ZWHAZ2J · pith_short_8: SGSCNZ2T

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/SGSCNZ2T3ZWHAZ2JTPVKMZ6EUE \
  | 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: 91a426e753de6c7067499beaa667c4a127eaed6bbcc416fd07260d2eaae3afc8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7ad4a33b009992c020329ce8cbdaf841dbc0e3e7cdf3d598d173da1f2b32dca0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GR",
    "submitted_at": "2015-04-29T06:42:38Z",
    "title_canon_sha256": "428c3746a9c9b8bb30cc3e8d8114fac65879b6090f417f9daeea06bb3fe1b34a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.07736",
    "kind": "arxiv",
    "version": 1
  }
}