Pith Number

pith:JIJ6CW2J

pith:2012:JIJ6CW2JQ26UNK5MYMKGGUYBK2

not attested not anchored not stored refs pending

The optical spectrum of PKS 1222+216 and its black hole mass

A. Treves, C.M. Raiteri, E.P. Farina, R. Decarli, R. Falomo

arxiv:1205.0021 v1 · 2012-04-30 · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{JIJ6CW2JQ26UNK5MYMKGGUYBK2}

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	2026-05-18T01:57:42.104290Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4a13e15b4986bd46abacc31463530156ab8d81b6f51bb68c6d06d51cbd2cde1d

Aliases

arxiv: 1205.0021 · arxiv_version: 1205.0021v1 · doi: 10.48550/arxiv.1205.0021 · pith_short_12: JIJ6CW2JQ26U · pith_short_16: JIJ6CW2JQ26UNK5M · pith_short_8: JIJ6CW2J

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/JIJ6CW2JQ26UNK5MYMKGGUYBK2 \
  | 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: 4a13e15b4986bd46abacc31463530156ab8d81b6f51bb68c6d06d51cbd2cde1d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "67d5347d9f448159d60310591e1f833716c77a043a76fd8b6077459d5ff0d3a0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-04-30T20:07:00Z",
    "title_canon_sha256": "4c889604c7ec4431866637ca942cc774761dd2a0feb4e25c4596c967138ce57e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1205.0021",
    "kind": "arxiv",
    "version": 1
  }
}