Pith Number

pith:HV6Z2YNT

pith:2021:HV6Z2YNT3SMAFXJIQMF3LH7X4G

not attested not anchored not stored refs pending

The GLEAMing of the First Supermassive Black Holes

Anna Kapi\'nska, Carlos De Breuck, Guillaume Drouart, Jo\"el Vernet, Jose Afonso, Joseph R. Callingham, Matthew D. Lehnert, Melanie Johnston-Hollitt, Nick Seymour, Tim J. Galvin

arxiv:2111.08104 v1 · 2021-11-15 · 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{HV6Z2YNT3SMAFXJIQMF3LH7X4G}

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	2026-07-05T03:32:29.547926Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3d7d9d61b3dc9802dd28830bb59ff7e18d16bd88dc6b86dffa59f67659ee331d

Aliases

arxiv: 2111.08104 · arxiv_version: 2111.08104v1 · doi: 10.48550/arxiv.2111.08104 · pith_short_12: HV6Z2YNT3SMA · pith_short_16: HV6Z2YNT3SMAFXJI · pith_short_8: HV6Z2YNT

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/HV6Z2YNT3SMAFXJIQMF3LH7X4G \
  | 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: 3d7d9d61b3dc9802dd28830bb59ff7e18d16bd88dc6b86dffa59f67659ee331d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dbb07d7623b742ee54f1e7adcc64eb4112e8d1db25f0b4200342fb4ecc0b615a",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2021-11-15T22:03:40Z",
    "title_canon_sha256": "296bf7de288abebd068c2332724ffccb64f6c2349be50812d65ac14f90fa5258"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2111.08104",
    "kind": "arxiv",
    "version": 1
  }
}