Pith Number

pith:2ZQGCZ6C

pith:2011:2ZQGCZ6CX4TRQX4RZ72X5L6D5V

not attested not anchored not stored refs pending

Discovery of strong Iron K{\alpha} emitting Compton thick quasars at z=2.5 and 2.9

C. Feruglio, C. Malacaria, D. M. Alexander, E. Daddi, E. Piconcelli, F. Fiore

arxiv:1101.3478 v1 · 2011-01-18 · astro-ph.CO · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2ZQGCZ6CX4TRQX4RZ72X5L6D5V}

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	2026-05-18T02:03:26.806657Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d6606167c2bf27185f91cff57eafc3ed7734b03e517e0d82cfd4c364cf1eb50c

Aliases

arxiv: 1101.3478 · arxiv_version: 1101.3478v1 · doi: 10.48550/arxiv.1101.3478 · pith_short_12: 2ZQGCZ6CX4TR · pith_short_16: 2ZQGCZ6CX4TRQX4R · pith_short_8: 2ZQGCZ6C

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/2ZQGCZ6CX4TRQX4RZ72X5L6D5V \
  | 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: d6606167c2bf27185f91cff57eafc3ed7734b03e517e0d82cfd4c364cf1eb50c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "544eb8aaff72338d88bd1ab4141449d2b5a8fb70b5f1f34e6112f88b663d5166",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2011-01-18T15:33:14Z",
    "title_canon_sha256": "37a225035116d4276b56bda3b92d634c977d19590fadfa6b9d500996ea0c8737"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1101.3478",
    "kind": "arxiv",
    "version": 1
  }
}