Pith Number

pith:NDPJ4Y2H

pith:2013:NDPJ4Y2HL3AHY5AKQQNKKAXKOY

not attested not anchored not stored refs pending

Experimental demonstration of free-space information transfer using phase modulated orbital angular momentum radio

A. Bianchini, B. Thid\'e, C. G. Someda, F. Carraro, F. Romanato, F. Tamburini, M. del Pup, V. Boaga

arxiv:1302.2990 v2 · 2013-02-13 · physics.class-ph · astro-ph.IM · physics.optics · physics.space-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{NDPJ4Y2HL3AHY5AKQQNKKAXKOY}

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	2026-05-18T03:33:37.099043Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

68de9e63475ec07c740a841aa502ea7616a46a84f44d58f382e170ffd4cfb48d

Aliases

arxiv: 1302.2990 · arxiv_version: 1302.2990v2 · doi: 10.48550/arxiv.1302.2990 · pith_short_12: NDPJ4Y2HL3AH · pith_short_16: NDPJ4Y2HL3AHY5AK · pith_short_8: NDPJ4Y2H

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/NDPJ4Y2HL3AHY5AKQQNKKAXKOY \
  | 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: 68de9e63475ec07c740a841aa502ea7616a46a84f44d58f382e170ffd4cfb48d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "76eaba03c2f561ce989079b0a3430298c97a6e57576b6edf4dba75b8e4200ed4",
    "cross_cats_sorted": [
      "astro-ph.IM",
      "physics.optics",
      "physics.space-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.class-ph",
    "submitted_at": "2013-02-13T06:18:16Z",
    "title_canon_sha256": "da8641c6b4b3f364450dca0403d44740fbad795c44fd159ec3eecef534e86e81"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1302.2990",
    "kind": "arxiv",
    "version": 2
  }
}