Pith Number

pith:7RGKO6OY

pith:2009:7RGKO6OY2LROGDAR2MLRNVRSD5

not attested not anchored not stored refs pending

Good Concatenated Code Ensembles for the Binary Erasure Channel

Alexandre Graell i Amat, Eirik Rosnes

arxiv:0904.2482 v1 · 2009-04-16 · 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{7RGKO6OY2LROGDAR2MLRNVRSD5}

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	2026-05-18T04:21:11.064964Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fc4ca779d8d2e2e30c11d31716d6321f6595e23b5da64f7aef09c5f2ed714fe1

Aliases

arxiv: 0904.2482 · arxiv_version: 0904.2482v1 · doi: 10.48550/arxiv.0904.2482 · pith_short_12: 7RGKO6OY2LRO · pith_short_16: 7RGKO6OY2LROGDAR · pith_short_8: 7RGKO6OY

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/7RGKO6OY2LROGDAR2MLRNVRSD5 \
  | 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: fc4ca779d8d2e2e30c11d31716d6321f6595e23b5da64f7aef09c5f2ed714fe1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2cffa205743aa6b40c5afe340a7866498f86a585f3b8ae50070009a01372b5ca",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2009-04-16T13:32:47Z",
    "title_canon_sha256": "fea05f124c7b218b163d25abac8f356147589a38bd4c23afa77d146be2ea8996"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.2482",
    "kind": "arxiv",
    "version": 1
  }
}