Pith Number

pith:DNC4IJDW

pith:1999:DNC4IJDW4MIAR4TDX42LEKHFW4

not attested not anchored not stored refs pending

Radio Observations of the Hubble Deep Field South - a New Class of Radio-Luminous Galaxies?

A. Hopkins, B.J. Boyle, F. Badia, J. Ekers, J. Higdon, M.H. Wieringa, R.D. Ekers, R.E. Williams, R.J. Sault, R.P. Norris

arxiv:astro-ph/9910437 v2 · 1999-10-25 · 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{DNC4IJDW4MIAR4TDX42LEKHFW4}

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	2026-07-04T14:17:15.267107Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1b45c42476e31008f263bf34b228e5b732c9d9f616b54894432ecf832d0d5eb6

Aliases

arxiv: astro-ph/9910437 · arxiv_version: astro-ph/9910437v2 · doi: 10.48550/arxiv.astro-ph/9910437 · pith_short_12: DNC4IJDW4MIA · pith_short_16: DNC4IJDW4MIAR4TD · pith_short_8: DNC4IJDW

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/DNC4IJDW4MIAR4TDX42LEKHFW4 \
  | 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: 1b45c42476e31008f263bf34b228e5b732c9d9f616b54894432ecf832d0d5eb6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6a7e85b5d34eeb2e7e4406342cf2795cc2fbb7dafa908d92cc5689a3c6bb353e",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-10-25T00:16:30Z",
    "title_canon_sha256": "30f12dd0d64ca24ada9e6d9bd3a54e6a97fb865ef3bd4dc2b6aae3c0a283c8c4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9910437",
    "kind": "arxiv",
    "version": 2
  }
}