Pith Number

pith:QR7ZV5PS

pith:2008:QR7ZV5PSDMJLFWGCEIQA26PNBY

not attested not anchored not stored refs pending

On the Design of Universal LDPC Codes

Ali Sanaei, Mahdi Ramezani, Masoud Ardakani

arxiv:0806.0036 v1 · 2008-05-30 · 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{QR7ZV5PSDMJLFWGCEIQA26PNBY}

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	2026-05-18T00:58:48.532537Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

847f9af5f21b12b2d8c222200d79ed0e34422447375dff688f4a7400ddbcde8d

Aliases

arxiv: 0806.0036 · arxiv_version: 0806.0036v1 · doi: 10.48550/arxiv.0806.0036 · pith_short_12: QR7ZV5PSDMJL · pith_short_16: QR7ZV5PSDMJLFWGC · pith_short_8: QR7ZV5PS

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/QR7ZV5PSDMJLFWGCEIQA26PNBY \
  | 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: 847f9af5f21b12b2d8c222200d79ed0e34422447375dff688f4a7400ddbcde8d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "820145a9c09ce439595cd38e884ae1de5ff2cf21828b450e4a1c1be4ed87f04f",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2008-05-30T22:03:00Z",
    "title_canon_sha256": "af0df22498e07f139a79a477061090d926b747cb1761d14a78e9bf1a72a4f443"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0806.0036",
    "kind": "arxiv",
    "version": 1
  }
}