Pith Number

pith:BSFX5MJT

pith:2019:BSFX5MJTIQH7Z7A4554PXQQXLE

not attested not anchored not stored refs pending

Numerical constraints on the size of generation ships from total energy expenditure on board, annual food production and space farming techniques

C. Beluffi, F. Marin, L. Grau, R. Taylor

arxiv:1901.09542 v1 · 2019-01-28 · physics.pop-ph · astro-ph.IM

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{BSFX5MJTIQH7Z7A4554PXQQXLE}

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	2026-05-17T23:55:24.541494Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0c8b7eb133440ffcfc1cef78fbc21759039a0522fcaa6c6a7cf7fba521e454c0

Aliases

arxiv: 1901.09542 · arxiv_version: 1901.09542v1 · doi: 10.48550/arxiv.1901.09542 · pith_short_12: BSFX5MJTIQH7 · pith_short_16: BSFX5MJTIQH7Z7A4 · pith_short_8: BSFX5MJT

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/BSFX5MJTIQH7Z7A4554PXQQXLE \
  | 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: 0c8b7eb133440ffcfc1cef78fbc21759039a0522fcaa6c6a7cf7fba521e454c0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ff60b83d3485a5758ab0bb89da8f04a7db9d5eb8307a6ae4b24d0806d5481789",
    "cross_cats_sorted": [
      "astro-ph.IM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2019-01-28T08:09:25Z",
    "title_canon_sha256": "9293427ffa98fd243ef07277f5e30140d7eeec4d75d97d49bc0454eb1288b7ee"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1901.09542",
    "kind": "arxiv",
    "version": 1
  }
}