Pith Number

pith:VRASUOU7

pith:2018:VRASUOU7AKIQAJCS3O2O6Y2FYO

not attested not anchored not stored refs pending

Covariance Matrix Estimation for Massive MIMO

Karthik Upadhya, Sergiy A. Vorobyov

arxiv:1802.01513 v2 · 2018-02-05 · 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{VRASUOU7AKIQAJCS3O2O6Y2FYO}

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	2026-05-18T00:19:21.241904Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ac412a3a9f0291002452dbb4ef6345c39c9ef7539f697a6c9930a955ee35d3a2

Aliases

arxiv: 1802.01513 · arxiv_version: 1802.01513v2 · doi: 10.48550/arxiv.1802.01513 · pith_short_12: VRASUOU7AKIQ · pith_short_16: VRASUOU7AKIQAJCS · pith_short_8: VRASUOU7

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/VRASUOU7AKIQAJCS3O2O6Y2FYO \
  | 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: ac412a3a9f0291002452dbb4ef6345c39c9ef7539f697a6c9930a955ee35d3a2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0ccf894b8d9e4e75d9e7fb81b2c77f0207e5ceb01bfd3db95f095975a3b9c9f9",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2018-02-05T17:01:02Z",
    "title_canon_sha256": "034e064c6f801dea67260a5c7962150b259b3bb3d1bfe027586817f265396460"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1802.01513",
    "kind": "arxiv",
    "version": 2
  }
}