Pith Number

pith:42HPAQMZ

pith:2012:42HPAQMZU6MSYQNOWFCNO46O7I

not attested not anchored not stored refs pending

Design of Multiple-Edge Protographs for QC LDPC Codes Avoiding Short Inevitable Cycles

Dong-Joon Shin, Hosung Park, Jong-Seon No, Seokbeom Hong

arxiv:1210.3906 v1 · 2012-10-15 · cs.IT · math.IT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{42HPAQMZU6MSYQNOWFCNO46O7I}

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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	2026-05-18T00:58:42.824589Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e68ef04199a7992c41aeb144d773cefa20cf05d845b7854dce71d9732d7c3575

Aliases

arxiv: 1210.3906 · arxiv_version: 1210.3906v1 · doi: 10.48550/arxiv.1210.3906 · pith_short_12: 42HPAQMZU6MS · pith_short_16: 42HPAQMZU6MSYQNO · pith_short_8: 42HPAQMZ

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/42HPAQMZU6MSYQNOWFCNO46O7I \
  | 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: e68ef04199a7992c41aeb144d773cefa20cf05d845b7854dce71d9732d7c3575

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "994ffe6e32fa42c3477e87cef1d48dd1c683e9cf71d3f07b49776c4b4065ee3a",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2012-10-15T05:57:49Z",
    "title_canon_sha256": "d94502ec40d5e13ca9e015394448089c1a2eb433dfd606dfa2664ea69157539b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1210.3906",
    "kind": "arxiv",
    "version": 1
  }
}