Pith Number

pith:Z5GIRAOO

pith:2009:Z5GIRAOOLWSJONCWVZ2EAWULNF

not attested not anchored not stored refs pending

Spectrum sensing by cognitive radios at very low SNR

Ali H. Sayed, Stephen J. Shellhammer, Wenyi Zhang, Zhi Quan

arxiv:0907.1992 v2 · 2009-07-11 · 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{Z5GIRAOOLWSJONCWVZ2EAWULNF}

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	2026-05-18T00:59:11.323293Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cf4c8881ce5da4973456ae74405a8b696ea9d84bd3a0d772477f074a19ea8483

Aliases

arxiv: 0907.1992 · arxiv_version: 0907.1992v2 · doi: 10.48550/arxiv.0907.1992 · pith_short_12: Z5GIRAOOLWSJ · pith_short_16: Z5GIRAOOLWSJONCW · pith_short_8: Z5GIRAOO

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/Z5GIRAOOLWSJONCWVZ2EAWULNF \
  | 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: cf4c8881ce5da4973456ae74405a8b696ea9d84bd3a0d772477f074a19ea8483

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e735f649a5e23653cf5a7c705fd7a53848aa820633fd5651d259eab1b587687c",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2009-07-11T20:38:37Z",
    "title_canon_sha256": "91427869a1883128f38e8618cfa8da6f4e34d9b779c0d78d010bc2de3f158328"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.1992",
    "kind": "arxiv",
    "version": 2
  }
}