Pith Number

pith:IRDFJRM3

pith:2009:IRDFJRM3MJXWDQO5C77AT3GZI7

not attested not anchored not stored refs pending

A New Empirical Method to Infer the Starburst History of the Universe from Local Galaxy Properties

Lars Hernquist (CfA), Philip F. Hopkins (Berkeley)

arxiv:0910.4582 v1 · 2009-10-23 · astro-ph.CO · astro-ph.GA · astro-ph.SR

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	2026-05-18T02:11:12.028407Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

444654c59b626f61c1dd17fe09ecd947fa9e64fce791157f9c19d76b3de2c729

Aliases

arxiv: 0910.4582 · arxiv_version: 0910.4582v1 · doi: 10.48550/arxiv.0910.4582 · pith_short_12: IRDFJRM3MJXW · pith_short_16: IRDFJRM3MJXWDQO5 · pith_short_8: IRDFJRM3

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/IRDFJRM3MJXWDQO5C77AT3GZI7 \
  | 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: 444654c59b626f61c1dd17fe09ecd947fa9e64fce791157f9c19d76b3de2c729

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ff16d88f13916a3c695d105620bb5deb1d1e1d6ced92bdeee7ef291dbc17f31a",
    "cross_cats_sorted": [
      "astro-ph.GA",
      "astro-ph.SR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-10-23T20:02:13Z",
    "title_canon_sha256": "3881b90181d68c25f32fa37356219fed46fa79ea05315bbe3b9b9de1567098af"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0910.4582",
    "kind": "arxiv",
    "version": 1
  }
}