Pith Number

pith:EIB6U2F7

pith:2025:EIB6U2F76HIIMTP5EE64YHPR5Z

not attested not anchored not stored refs pending

Improvised Nuclear Weapons with 60%-Enriched Uranium

Matt E. Caplan

arxiv:2507.20390 v1 · 2025-07-27 · physics.soc-ph · nucl-ex · physics.pop-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{EIB6U2F76HIIMTP5EE64YHPR5Z}

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.

Cited by

1 paper in Pith

Improvised Nuclear Weapons with 60%-Enriched Uranium

Receipt and verification

First computed	2026-07-05T11:44:18.457132Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2203ea68bff1d0864dfd213dcc1df1ee6fa5386df82db1a015b42bb09dcb5437

Aliases

arxiv: 2507.20390 · arxiv_version: 2507.20390v1 · doi: 10.48550/arxiv.2507.20390 · pith_short_12: EIB6U2F76HII · pith_short_16: EIB6U2F76HIIMTP5 · pith_short_8: EIB6U2F7

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/EIB6U2F76HIIMTP5EE64YHPR5Z \
  | 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: 2203ea68bff1d0864dfd213dcc1df1ee6fa5386df82db1a015b42bb09dcb5437

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "504308304e1f7ce2287630c9180407e5c3ed019d351efdd727f08aef32b26892",
    "cross_cats_sorted": [
      "nucl-ex",
      "physics.pop-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.soc-ph",
    "submitted_at": "2025-07-27T19:16:21Z",
    "title_canon_sha256": "94977e7cdb3e67219a57829cb5fd5e8cfcc5e69b0da1aa30c7a9d02ab8cadf9a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2507.20390",
    "kind": "arxiv",
    "version": 1
  }
}