Pith Number

pith:SVINHMZQ

pith:2012:SVINHMZQR36JV47PBDHIOKVHLT

not attested not anchored not stored refs pending

A solution of Sun's $520 challenge concerning 520/pi

Armin Straub, Mathew Rogers

arxiv:1210.2373 v1 · 2012-10-08 · math.NT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SVINHMZQR36JV47PBDHIOKVHLT}

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	2026-05-18T03:30:02.494769Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9550d3b3308efc9af3ef08ce872aa75cff5fd5bad4e4bae7129bc66f6bc6b3a2

Aliases

arxiv: 1210.2373 · arxiv_version: 1210.2373v1 · doi: 10.48550/arxiv.1210.2373 · pith_short_12: SVINHMZQR36J · pith_short_16: SVINHMZQR36JV47P · pith_short_8: SVINHMZQ

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/SVINHMZQR36JV47PBDHIOKVHLT \
  | 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: 9550d3b3308efc9af3ef08ce872aa75cff5fd5bad4e4bae7129bc66f6bc6b3a2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f623809233afeb222076fe151500466d3800f2d74ee1eb0ca9dd344c0a298ec2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NT",
    "submitted_at": "2012-10-08T18:28:35Z",
    "title_canon_sha256": "d1d640ca211e21c5188eb02aab5263c7acaa98bdf9402e3719ae4d6cd7f69b70"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1210.2373",
    "kind": "arxiv",
    "version": 1
  }
}