Pith Number

pith:QAMCFZJO

pith:2025:QAMCFZJO4FJJ24TD7IYXR4PEAU

not attested not anchored not stored refs pending

To center or not to center? Hyperspectral data vs. quantum covariance matrices

Agata M. Wijata, Artur Miroszewski, Jakub Nalepa

arxiv:2504.00530 v1 · 2025-04-01 · quant-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QAMCFZJO4FJJ24TD7IYXR4PEAU}

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	2026-07-05T10:42:46.582094Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

801822e52ee1529d7263fa3178f1e4053cd1777ec035658ca97332ffa3c37cef

Aliases

arxiv: 2504.00530 · arxiv_version: 2504.00530v1 · doi: 10.48550/arxiv.2504.00530 · pith_short_12: QAMCFZJO4FJJ · pith_short_16: QAMCFZJO4FJJ24TD · pith_short_8: QAMCFZJO

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/QAMCFZJO4FJJ24TD7IYXR4PEAU \
  | 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: 801822e52ee1529d7263fa3178f1e4053cd1777ec035658ca97332ffa3c37cef

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "23301a6353d7d04769b42cc81e9e19ee208aa53af3ac1071f46f958e3ebeab3a",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2025-04-01T08:23:01Z",
    "title_canon_sha256": "4e2b118df14e46a399267c90775da79b786de1c77a519ac5c54fef449c2df387"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2504.00530",
    "kind": "arxiv",
    "version": 1
  }
}