Pith Number

pith:K2NW5IEE

pith:2012:K2NW5IEEOR6Q4NMOSG6WVRLIJW

not attested not anchored not stored refs pending

The colours of BL Lac objects: a new approach to their classification

Enrico Massaro, Roberto Nesci, Silvia Piranomonte

arxiv:1202.4614 v1 · 2012-02-21 · 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{K2NW5IEEOR6Q4NMOSG6WVRLIJW}

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	2026-05-18T01:58:22.931364Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

569b6ea084747d0e358e91bd6ac5684d8c5f7004faedd393a6a836c11deb2e64

Aliases

arxiv: 1202.4614 · arxiv_version: 1202.4614v1 · doi: 10.48550/arxiv.1202.4614 · pith_short_12: K2NW5IEEOR6Q · pith_short_16: K2NW5IEEOR6Q4NMO · pith_short_8: K2NW5IEE

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/K2NW5IEEOR6Q4NMOSG6WVRLIJW \
  | 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: 569b6ea084747d0e358e91bd6ac5684d8c5f7004faedd393a6a836c11deb2e64

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5a62ffc44c31d8f3778aefddcc7426d9d12e81a18f79729be06a289e86006d5d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2012-02-21T12:03:29Z",
    "title_canon_sha256": "38ebebf549517ebe16d6130a3139869c36c26fbb6132f9504416dd1e28e50abe"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1202.4614",
    "kind": "arxiv",
    "version": 1
  }
}