Pith Number

pith:V72KSLIJ

pith:2019:V72KSLIJPH4Q5SRVTYV5XTQMUQ

not attested not anchored not stored refs pending

An XMM-Newton look at the strongly variable radio-weak BL Lac Fermi J1544-0639

A. Bazzano, E. Pian, F. Panessa, F. Ursini, G. Bruni, K. Sokolovsky, L. Bassani, N. Masetti, P. Ubertini

arxiv:1901.01833 v2 · 2019-01-07 · 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{V72KSLIJPH4Q5SRVTYV5XTQMUQ}

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	2026-05-17T23:54:42.492831Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

aff4a92d0979f90eca359e2bdbce0ca42b39c93dc0daef4a0c490dddeec298be

Aliases

arxiv: 1901.01833 · arxiv_version: 1901.01833v2 · doi: 10.48550/arxiv.1901.01833 · pith_short_12: V72KSLIJPH4Q · pith_short_16: V72KSLIJPH4Q5SRV · pith_short_8: V72KSLIJ

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/V72KSLIJPH4Q5SRVTYV5XTQMUQ \
  | 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: aff4a92d0979f90eca359e2bdbce0ca42b39c93dc0daef4a0c490dddeec298be

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8f6ac121c1fb853e08a82a2c6e212cfb21c0feb991137afd2f38ad64f4bbec02",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2019-01-07T14:30:29Z",
    "title_canon_sha256": "37ce538f07b1f23817efb23ecb13d2f33584ffabb1e2da631a6d75f92d7f6480"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1901.01833",
    "kind": "arxiv",
    "version": 2
  }
}