Pith Number

pith:NGKVBLXZ

pith:2013:NGKVBLXZTNDIGBDOHKEPSVJHDQ

not attested not anchored not stored refs pending

A fast and portable Re-Implementation of Piskunov and Valenti's Optimal-Extraction Algorithm with improved Cosmic-Ray Removal and Optimal Sky Subtraction

A. Ritter, E. A. Hyde, Q. A. Parker

arxiv:1311.4755 v2 · 2013-11-19 · astro-ph.IM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NGKVBLXZTNDIGBDOHKEPSVJHDQ}

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	2026-05-18T01:46:23.062381Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

699550aef99b4683046e3a88f955271c1ba73692639770f7ad533bc386dda01b

Aliases

arxiv: 1311.4755 · arxiv_version: 1311.4755v2 · doi: 10.48550/arxiv.1311.4755 · pith_short_12: NGKVBLXZTNDI · pith_short_16: NGKVBLXZTNDIGBDO · pith_short_8: NGKVBLXZ

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/NGKVBLXZTNDIGBDOHKEPSVJHDQ \
  | 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: 699550aef99b4683046e3a88f955271c1ba73692639770f7ad533bc386dda01b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d3f347cf600a8f64367d32d4d389d97fc4bc6a21fefc525f4530054c39cf4127",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2013-11-19T14:38:05Z",
    "title_canon_sha256": "03af928d62d5c98e33ebb5b51dcaedede0fd4d93d85ac6ea2e4eba545afc06fc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1311.4755",
    "kind": "arxiv",
    "version": 2
  }
}