Pith Number

pith:QYIWEIJC

pith:2018:QYIWEIJCH5CRSQ2F6DHUPR6LXZ

not attested not anchored not stored refs pending

Interstellar Escape from Proxima b is Barely Possible with Chemical Rockets

Abraham Loeb (Harvard)

arxiv:1804.03698 v1 · 2018-04-10 · physics.pop-ph · astro-ph.EP · 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{QYIWEIJCH5CRSQ2F6DHUPR6LXZ}

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	2026-05-18T00:18:45.293401Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

86116221223f45194345f0cf47c7cbbe72cb99c4101c27707827284bd57abd9e

Aliases

arxiv: 1804.03698 · arxiv_version: 1804.03698v1 · doi: 10.48550/arxiv.1804.03698 · pith_short_12: QYIWEIJCH5CR · pith_short_16: QYIWEIJCH5CRSQ2F · pith_short_8: QYIWEIJC

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/QYIWEIJCH5CRSQ2F6DHUPR6LXZ \
  | 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: 86116221223f45194345f0cf47c7cbbe72cb99c4101c27707827284bd57abd9e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "32cbbb5b1f3bf04c41e4d9c6b73fe784239b5ce6023fe719673e2c71c3e4ec43",
    "cross_cats_sorted": [
      "astro-ph.EP",
      "astro-ph.IM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2018-04-10T19:43:17Z",
    "title_canon_sha256": "ffbb578457026922088517c17a5a7c503eb6190bfe3630de7db4092a80f17b40"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.03698",
    "kind": "arxiv",
    "version": 1
  }
}