Pith Number

pith:N33CWNU2

pith:2018:N33CWNU2QOWX7A3QQQKT6VC2RZ

not attested not anchored not stored refs pending

Interstellar Communication. VIII. Hard limits on the number of bits per photon

Michael Hippke

arxiv:1801.06218 v1 · 2018-01-18 · astro-ph.IM · quant-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{N33CWNU2QOWX7A3QQQKT6VC2RZ}

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	2026-05-18T00:25:33.133213Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6ef62b369a83ad7f837084153f545a8e7ae2a0dfecb0d5e6550949c61f3b25fb

Aliases

arxiv: 1801.06218 · arxiv_version: 1801.06218v1 · doi: 10.48550/arxiv.1801.06218 · pith_short_12: N33CWNU2QOWX · pith_short_16: N33CWNU2QOWX7A3Q · pith_short_8: N33CWNU2

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/N33CWNU2QOWX7A3QQQKT6VC2RZ \
  | 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: 6ef62b369a83ad7f837084153f545a8e7ae2a0dfecb0d5e6550949c61f3b25fb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3b5ea52b246f60f8b4e7a7cffbfe91d3845741ab96fda1d0060b62bf3bfc415f",
    "cross_cats_sorted": [
      "quant-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2018-01-18T20:02:10Z",
    "title_canon_sha256": "818095e8dde28ea5378b2fc4bae74fdfe9e580ddf1d2f2838ed79e3c46ef8f83"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1801.06218",
    "kind": "arxiv",
    "version": 1
  }
}