Pith Number

pith:I2XME63C

pith:2009:I2XME63CJNSVYBWIHKPY3INL5L

not attested not anchored not stored refs pending

Galaxy Zoo : 'Hanny's Voorwerp', a quasar light echo?

Alex Szalay, Anze Slosar, Chris Lintott, Dan Andreescu, Daniel Smith, Daniel Thomas, Edward Edmondson, Hanny van Arkel, Jan vandenBerg, Jordan Raddick, Kate Land, Kevin Schawinski, Matt Jarvis, Nicola Bennert, Peter Herbert, Phil Murray, Robert Nichol, Shanil Virani, Steven Bamford, William Keel

arxiv:0906.5304 v1 · 2009-06-29 · astro-ph.CO

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	2026-05-18T02:13:11.992158Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

46aec27b624b655c06c83a9f8da1abeacfa2fed4b9383fb479b223989d60ee83

Aliases

arxiv: 0906.5304 · arxiv_version: 0906.5304v1 · doi: 10.48550/arxiv.0906.5304 · pith_short_12: I2XME63CJNSV · pith_short_16: I2XME63CJNSVYBWI · pith_short_8: I2XME63C

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/I2XME63CJNSVYBWIHKPY3INL5L \
  | 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: 46aec27b624b655c06c83a9f8da1abeacfa2fed4b9383fb479b223989d60ee83

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "590d1cc5392f243662b5607f96745733a4ae3ae166c4995e58783b007263f213",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-06-29T15:49:46Z",
    "title_canon_sha256": "fcb0de0eb16f6662e5edae2e5689644839da12f5d042c74c9a6d4b0a674c6328"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0906.5304",
    "kind": "arxiv",
    "version": 1
  }
}