Pith Number

pith:NPCAOGD2

pith:2018:NPCAOGD2D7D5QWVNWEKL5VGW6E

not attested not anchored not stored refs pending

Asteroid mining with small spacecraft and its economic feasibility

Chris Welch, Dan Fries, Pablo Calla

arxiv:1808.05099 v2 · 2018-08-15 · 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{NPCAOGD2D7D5QWVNWEKL5VGW6E}

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	2026-05-17T23:42:35.017491Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6bc407187a1fc7d85aadb114bed4d6f1383af652b355624c99c22b21e8b06038

Aliases

arxiv: 1808.05099 · arxiv_version: 1808.05099v2 · doi: 10.48550/arxiv.1808.05099 · pith_short_12: NPCAOGD2D7D5 · pith_short_16: NPCAOGD2D7D5QWVN · pith_short_8: NPCAOGD2

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/NPCAOGD2D7D5QWVNWEKL5VGW6E \
  | 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: 6bc407187a1fc7d85aadb114bed4d6f1383af652b355624c99c22b21e8b06038

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "84ce816d4e214a8c2cb3f4c8f362da676b30df2a6c5887669945339cf8ae99c6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2018-08-15T14:30:58Z",
    "title_canon_sha256": "393a6fcdd141e4f23c91a23917bd3018916d75bacd587d5d031e230d335c3278"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1808.05099",
    "kind": "arxiv",
    "version": 2
  }
}