Pith Number

pith:NHA3W3AI

pith:1999:NHA3W3AIUWHOYTWYFWOT6EUDSG

not attested not anchored not stored refs pending

The nature of the hard X-ray power-law tail in M87

I), M.Guainazzi (1), Milano, NL; (2) IFC "Occhialini" C.N.R., Noordwijk, S.Molendi (2) ((1) Astrophysics Division, SSD of ESA

arxiv:astro-ph/9910271 v1 · 1999-10-14 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NHA3W3AIUWHOYTWYFWOT6EUDSG}

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	2026-07-04T15:51:15.395966Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

69c1bb6c08a58eec4ed82d9d3f128391a144904d5ba80e36549bdb5f342ae033

Aliases

arxiv: astro-ph/9910271 · arxiv_version: astro-ph/9910271v1 · doi: 10.48550/arxiv.astro-ph/9910271 · pith_short_12: NHA3W3AIUWHO · pith_short_16: NHA3W3AIUWHOYTWY · pith_short_8: NHA3W3AI

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/NHA3W3AIUWHOYTWYFWOT6EUDSG \
  | 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: 69c1bb6c08a58eec4ed82d9d3f128391a144904d5ba80e36549bdb5f342ae033

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "48056914f88102bc01ae6775c2fb27fe6b288756e84fb12f50652ee6e44b474e",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-10-14T17:11:38Z",
    "title_canon_sha256": "7473bac7735de285737edf20c82883ac6115bb5396b04303499d101939ef6715"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9910271",
    "kind": "arxiv",
    "version": 1
  }
}