Pith Number

pith:RCHEFOUF

pith:2015:RCHEFOUFJLUSJDBWCTHOQ2GS35

not attested not anchored not stored refs pending

Upper limits on the probability of an interstellar civilization arising in the local Solar neighborhood

Daniel Cartin

arxiv:1501.05904 v1 · 2015-01-22 · 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{RCHEFOUFJLUSJDBWCTHOQ2GS35}

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	2026-05-18T01:58:26.910960Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

888e42ba854ae9248c3614cee868d2df4ecea461ac83164833e830c95eab74a5

Aliases

arxiv: 1501.05904 · arxiv_version: 1501.05904v1 · doi: 10.48550/arxiv.1501.05904 · pith_short_12: RCHEFOUFJLUS · pith_short_16: RCHEFOUFJLUSJDBW · pith_short_8: RCHEFOUF

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/RCHEFOUFJLUSJDBWCTHOQ2GS35 \
  | 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: 888e42ba854ae9248c3614cee868d2df4ecea461ac83164833e830c95eab74a5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "edd2d075e210ea4e39edd01610b52af8f869b6d4c77d6269c9022b132bf3f09b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2015-01-22T14:05:23Z",
    "title_canon_sha256": "929fa8b313ddeea58dda657758aaf5bb5c51d9b0156d371ad8872b4c9fd2d335"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1501.05904",
    "kind": "arxiv",
    "version": 1
  }
}