Pith Number

pith:7EPFRI3D

pith:2007:7EPFRI3DGBDRNGBA3DHPX5IUPI

not attested not anchored not stored refs pending

Sending and Searching for Interstellar Messages

Alexander Zaitsev

arxiv:0711.2368 v1 · 2007-11-15 · 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{7EPFRI3DGBDRNGBA3DHPX5IUPI}

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	2026-05-18T02:16:09.380905Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f91e58a3633047169820d8cefbf5147a062f97bc0ee99671d45dfedbb5b0aaa9

Aliases

arxiv: 0711.2368 · arxiv_version: 0711.2368v1 · doi: 10.48550/arxiv.0711.2368 · pith_short_12: 7EPFRI3DGBDR · pith_short_16: 7EPFRI3DGBDRNGBA · pith_short_8: 7EPFRI3D

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/7EPFRI3DGBDRNGBA3DHPX5IUPI \
  | 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: f91e58a3633047169820d8cefbf5147a062f97bc0ee99671d45dfedbb5b0aaa9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5b3c0d6ca31e01de791d8a369e6d7ccf69a2bbdb6ed53ad5693be2cd72f723e0",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2007-11-15T12:46:32Z",
    "title_canon_sha256": "7ebfb4737975f06c0cbf69ea7b7e6e2e2b241772dd2d88649ab0e05c2b1b327e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0711.2368",
    "kind": "arxiv",
    "version": 1
  }
}