Pith Number

pith:RA2JHPE2

pith:2009:RA2JHPE23HYDVZOPNABLYG3ELC

not attested not anchored not stored refs pending

Radio quiet, please! - protecting radio astronomy from interference

W. van Driel

arxiv:0906.2268 v1 · 2009-06-12 · 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{RA2JHPE23HYDVZOPNABLYG3ELC}

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	2026-07-04T15:43:44.331539Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

883493bc9ad9f03ae5cf6802bc1b6458899dfa7f84fda7b7b5e44da7db000c08

Aliases

arxiv: 0906.2268 · arxiv_version: 0906.2268v1 · doi: 10.48550/arxiv.0906.2268 · pith_short_12: RA2JHPE23HYD · pith_short_16: RA2JHPE23HYDVZOP · pith_short_8: RA2JHPE2

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/RA2JHPE23HYDVZOPNABLYG3ELC \
  | 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: 883493bc9ad9f03ae5cf6802bc1b6458899dfa7f84fda7b7b5e44da7db000c08

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e5814f535d881bf7335f19caa8833a4d52e61d19f9e8357de09f44e3b84c0dce",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2009-06-12T14:20:27Z",
    "title_canon_sha256": "aec237e9e14adb4937d71515f3ea8ee26858e3bfacc3ce80f17c1a3f3342237c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0906.2268",
    "kind": "arxiv",
    "version": 1
  }
}