Pith Number

pith:HHIJ2XAK

pith:2012:HHIJ2XAKPJWPKKTDAXPXKFFJTR

not attested not anchored not stored refs pending

Evidence of strong quasar feedback in the early Universe

A. Ferrara, C. Cicone, C. Feruglio, D. Lutz, E. Piconcelli, E. Sturm, F. Fiore, F. Walter, L. J. Tacconi, R. Genzel, R. Maiolino, R. Neri, S. Gallerani

arxiv:1204.2904 v2 · 2012-04-13 · astro-ph.CO · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HHIJ2XAKPJWPKKTDAXPXKFFJTR}

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	2026-05-18T01:57:52.831747Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

39d09d5c0a7a6cf52a6305df7514a99c7f0e297aa5547deea6885e05ba34b2fb

Aliases

arxiv: 1204.2904 · arxiv_version: 1204.2904v2 · doi: 10.48550/arxiv.1204.2904 · pith_short_12: HHIJ2XAKPJWP · pith_short_16: HHIJ2XAKPJWPKKTD · pith_short_8: HHIJ2XAK

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/HHIJ2XAKPJWPKKTDAXPXKFFJTR \
  | 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: 39d09d5c0a7a6cf52a6305df7514a99c7f0e297aa5547deea6885e05ba34b2fb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a0874e63b202756b49ca960d4abbba083e3f934ac668da9640498bbbc7052938",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-04-13T07:41:53Z",
    "title_canon_sha256": "bea41a149a77ccde7e15e2509a5d7436f37f6e07575055842739a2ec4fcd692c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1204.2904",
    "kind": "arxiv",
    "version": 2
  }
}