Pith Number

pith:2HEXU5UP

pith:2021:2HEXU5UPYX6HO54UQSEIMKPYKZ

not attested not anchored not stored refs pending

Extraction of instantaneous frequencies and amplitudes in nonstationary time-series data

Daniel E. Shea, David S. Ginger, J. Nathan Kutz, Rajiv Giridharagopal, Steven L. Brunton

arxiv:2104.01293 v1 · 2021-04-03 · eess.SP · cs.LG · cs.NA · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2HEXU5UPYX6HO54UQSEIMKPYKZ}

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	2026-07-05T02:51:21.770369Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d1c97a768fc5fc77779484888629f8566876ff870e2f1173b29d062738e3e23a

Aliases

arxiv: 2104.01293 · arxiv_version: 2104.01293v1 · doi: 10.48550/arxiv.2104.01293 · pith_short_12: 2HEXU5UPYX6H · pith_short_16: 2HEXU5UPYX6HO54U · pith_short_8: 2HEXU5UP

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/2HEXU5UPYX6HO54UQSEIMKPYKZ \
  | 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: d1c97a768fc5fc77779484888629f8566876ff870e2f1173b29d062738e3e23a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "caf816f43c262b48bcff80b1f1caa39253ccd023f21d0c7d73af379c0de97ce6",
    "cross_cats_sorted": [
      "cs.LG",
      "cs.NA",
      "math.NA"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "eess.SP",
    "submitted_at": "2021-04-03T02:19:07Z",
    "title_canon_sha256": "ba01df613c8b81a39f6fec1a04c95ecacd298fc48c2e85c99ad63c4da1af6a77"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2104.01293",
    "kind": "arxiv",
    "version": 1
  }
}