Pith Number

pith:QYJHTFEU

pith:2009:QYJHTFEU3V32XIB2QWZG27TPXD

not attested not anchored not stored refs pending

Channel Protection: Random Coding Meets Sparse Channels

Justin Romberg, M. Salman Asif, William Mantzel

arxiv:0908.4265 v2 · 2009-08-28 · cs.IT · math.IT · math.OC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QYJHTFEU3V32XIB2QWZG27TPXD}

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	2026-05-18T00:57:58.012044Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8612799494dd77aba03a85b26d7e6fb8c75dd681720f076137d0d369450a7a48

Aliases

arxiv: 0908.4265 · arxiv_version: 0908.4265v2 · doi: 10.48550/arxiv.0908.4265 · pith_short_12: QYJHTFEU3V32 · pith_short_16: QYJHTFEU3V32XIB2 · pith_short_8: QYJHTFEU

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/QYJHTFEU3V32XIB2QWZG27TPXD \
  | 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: 8612799494dd77aba03a85b26d7e6fb8c75dd681720f076137d0d369450a7a48

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b1883c778b75dac12cbe60366c16477bb491b7c6b0c317db90f903bfefff27cd",
    "cross_cats_sorted": [
      "math.IT",
      "math.OC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2009-08-28T19:36:46Z",
    "title_canon_sha256": "2544526c354150f0f4314c54da1093311d73c7e44f9786c72d76ea0271989a0b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0908.4265",
    "kind": "arxiv",
    "version": 2
  }
}