Pith Number

pith:75IU2RYS

pith:2025:75IU2RYSFOVMWCU5CSLMTBGIAE

not attested not anchored not stored refs pending

Spectral indices in active galactic nuclei as seen by Apertif and LOFAR

A. M. Kutkin, E. A. K. Adams, E. Orru, H. D\'enes, J. van Leeuwen, M. J. Norden, R. Morganti, T. A. Oosterloo

arxiv:2505.22161 v1 · 2025-05-28 · astro-ph.GA · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{75IU2RYSFOVMWCU5CSLMTBGIAE}

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	2026-07-05T11:48:49.312230Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ff514d47122baacb0a9d1496c984c8012651c899012f1e7315544479ea52d459

Aliases

arxiv: 2505.22161 · arxiv_version: 2505.22161v1 · doi: 10.48550/arxiv.2505.22161 · pith_short_12: 75IU2RYSFOVM · pith_short_16: 75IU2RYSFOVMWCU5 · pith_short_8: 75IU2RYS

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/75IU2RYSFOVMWCU5CSLMTBGIAE \
  | 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: ff514d47122baacb0a9d1496c984c8012651c899012f1e7315544479ea52d459

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "45779b122439bc928244dabadbb8ac78564167d13b1aab8682c01f57c5eb9861",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2025-05-28T09:24:58Z",
    "title_canon_sha256": "af29595de5bcf7e3b9d8e602a8baa1be2a52468a8d0dce2f5f2406f2e3a889c1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2505.22161",
    "kind": "arxiv",
    "version": 1
  }
}