Pith Number

pith:NB6BUKGF

pith:2000:NB6BUKGFFLNI3JJZSHUBHHBLCL

not attested not anchored not stored refs pending

A Sample of 669 Ultra Steep Spectrum Radio Sources to Find High Redshift Radio Galaxies

Carlos De Breuck (Leiden & IGPP/LLNL), Huub Rottgering & George Miley (Leiden), Wil van Breugel (IGPP/LLNL)

arxiv:astro-ph/0002297 v1 · 2000-02-15 · astro-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{NB6BUKGFFLNI3JJZSHUBHHBLCL}

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	2026-05-18T04:21:42.754364Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

687c1a28c52ada8da53991e8139c2b12e7e97a0dbe3d33b9c707055333e27bca

Aliases

arxiv: astro-ph/0002297 · arxiv_version: astro-ph/0002297v1 · doi: 10.48550/arxiv.astro-ph/0002297 · pith_short_12: NB6BUKGFFLNI · pith_short_16: NB6BUKGFFLNI3JJZ · pith_short_8: NB6BUKGF

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/NB6BUKGFFLNI3JJZSHUBHHBLCL \
  | 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: 687c1a28c52ada8da53991e8139c2b12e7e97a0dbe3d33b9c707055333e27bca

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1449d7d0e9c11d13335266f963d053c8842b1198e7352a5c9cf142e72b52f554",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2000-02-15T07:47:42Z",
    "title_canon_sha256": "2140043f5e9b0f62a41d8d1dd255c31b0e8867294de0e93c9af1a93a30fff709"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0002297",
    "kind": "arxiv",
    "version": 1
  }
}