Pith Number

pith:XASGVWCJ

pith:2009:XASGVWCJZL2FU3R44S7X7GYCSD

not attested not anchored not stored refs pending

Quasi-Cyclic LDPC Codes: Influence of Proto- and Tanner-Graph Structure on Minimum Hamming Distance Upper Bounds

Pascal O. Vontobel, Roxana Smarandache

arxiv:0901.4129 v2 · 2009-01-26 · cs.IT · cs.DM · 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{XASGVWCJZL2FU3R44S7X7GYCSD}

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	2026-05-18T00:58:48.254208Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b8246ad849caf45a6e3ce4bf7f9b0290e965f68b23ccb2bc6cf5a0e55be4ee63

Aliases

arxiv: 0901.4129 · arxiv_version: 0901.4129v2 · doi: 10.48550/arxiv.0901.4129 · pith_short_12: XASGVWCJZL2F · pith_short_16: XASGVWCJZL2FU3R4 · pith_short_8: XASGVWCJ

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/XASGVWCJZL2FU3R44S7X7GYCSD \
  | 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: b8246ad849caf45a6e3ce4bf7f9b0290e965f68b23ccb2bc6cf5a0e55be4ee63

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7a7aa170c8ac58a71adb9c8d0175b596f53dfd34e35f15544a355e60b3f7a16d",
    "cross_cats_sorted": [
      "cs.DM",
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2009-01-26T22:22:49Z",
    "title_canon_sha256": "a1bdcbc5d30d72e833ffab329ad7fd94da3287573648a5b6baa303a25b1065f5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0901.4129",
    "kind": "arxiv",
    "version": 2
  }
}