Pith Number

pith:JZM4JPML

pith:2017:JZM4JPMLSHGYRPBNMCJI6TWFHS

not attested not anchored not stored refs pending

Interstellar communication. V. Introduction to photon information efficiency (in bits per photon)

Michael Hippke

arxiv:1712.05682 v1 · 2017-12-14 · 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{JZM4JPMLSHGYRPBNMCJI6TWFHS}

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	2026-05-18T00:27:55.919487Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4e59c4bd8b91cd88bc2d60928f4ec53cb5d6013b54d6ba8526692d0d0e6e9377

Aliases

arxiv: 1712.05682 · arxiv_version: 1712.05682v1 · doi: 10.48550/arxiv.1712.05682 · pith_short_12: JZM4JPMLSHGY · pith_short_16: JZM4JPMLSHGYRPBN · pith_short_8: JZM4JPML

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/JZM4JPMLSHGYRPBNMCJI6TWFHS \
  | 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: 4e59c4bd8b91cd88bc2d60928f4ec53cb5d6013b54d6ba8526692d0d0e6e9377

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3b7791b4821d80bae7af4fc397460e371551026c7d3c9501482f438403a11f7a",
    "cross_cats_sorted": [
      "quant-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2017-12-14T18:37:03Z",
    "title_canon_sha256": "d6c5503c74c818e77064991b38fbf75b938754fe152b98ae49437ac7c436e957"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1712.05682",
    "kind": "arxiv",
    "version": 1
  }
}