Pith Number

pith:EBPC4ZYB

pith:2015:EBPC4ZYBSE7OBH33BXDWTQNONP

not attested not anchored not stored refs pending

A Dynamic Structure for High Dimensional Covariance Matrices and its Application in Portfolio Allocation

John Box, Shaojun Guo, Wenyang Zhang

arxiv:1506.01407 v1 · 2015-06-03 · stat.ME

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

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	2026-05-18T01:57:41.475689Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

205e2e6701913ee09f7b0dc769c1ae6bd690ea3c6672b66ae106865498b40a5b

Aliases

arxiv: 1506.01407 · arxiv_version: 1506.01407v1 · doi: 10.48550/arxiv.1506.01407 · pith_short_12: EBPC4ZYBSE7O · pith_short_16: EBPC4ZYBSE7OBH33 · pith_short_8: EBPC4ZYB

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/EBPC4ZYBSE7OBH33BXDWTQNONP \
  | 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: 205e2e6701913ee09f7b0dc769c1ae6bd690ea3c6672b66ae106865498b40a5b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2c63469531128c5f7b87a26812b09cd4fce1c2be66afbaeabaa1115f8950426e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.ME",
    "submitted_at": "2015-06-03T21:07:05Z",
    "title_canon_sha256": "d10881ff0562eb5ed1b87c8c8f2cfa07c73d06297880e22429a63644983463af"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1506.01407",
    "kind": "arxiv",
    "version": 1
  }
}