Pith Number

pith:3F6LNSFB

pith:2009:3F6LNSFB4U2L4LH2L6FEKAIWAG

not attested not anchored not stored refs pending

The Evolution of Cas A at Low Radio Frequencies

J. F. Helmboldt, N. E. Kassim

arxiv:0903.5010 v2 · 2009-03-28 · astro-ph.GA

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

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	2026-05-18T02:14:18.796519Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d97cb6c8a1e534be2cfa5f8a450116018a76169be3d52b56f9f55bb7a7ee5496

Aliases

arxiv: 0903.5010 · arxiv_version: 0903.5010v2 · doi: 10.48550/arxiv.0903.5010 · pith_short_12: 3F6LNSFB4U2L · pith_short_16: 3F6LNSFB4U2L4LH2 · pith_short_8: 3F6LNSFB

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/3F6LNSFB4U2L4LH2L6FEKAIWAG \
  | 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: d97cb6c8a1e534be2cfa5f8a450116018a76169be3d52b56f9f55bb7a7ee5496

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d40d27302d02bc1ad561cfa5784c1faa52df09709d51d8dd5d4278128a5ae08a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-03-28T23:02:55Z",
    "title_canon_sha256": "87f91932a10a7be4cce5e5eae6a37b22f95c7911c8c7c786e7ba394b12529946"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.5010",
    "kind": "arxiv",
    "version": 2
  }
}