Pith Number

pith:VCHPQMOP

pith:2017:VCHPQMOPSKG3JZUBPENNML2D7Y

not attested not anchored not stored refs pending

Translation of "Zur Ermittlung eines Objektes aus zwei Perspektiven mit innerer Orientierung" by Erwin Kruppa (1913)

Elias Mueggler, Guillermo Gallego, Peter Sturm

arxiv:1801.01454 v1 · 2017-12-25 · cs.CV

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{VCHPQMOPSKG3JZUBPENNML2D7Y}

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	2026-05-18T00:26:42.066228Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a88ef831cf928db4e681791ad62f43fe0bfd621ee9cc3f73829fb7f94c76cc11

Aliases

arxiv: 1801.01454 · arxiv_version: 1801.01454v1 · doi: 10.48550/arxiv.1801.01454 · pith_short_12: VCHPQMOPSKG3 · pith_short_16: VCHPQMOPSKG3JZUB · pith_short_8: VCHPQMOP

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/VCHPQMOPSKG3JZUBPENNML2D7Y \
  | 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: a88ef831cf928db4e681791ad62f43fe0bfd621ee9cc3f73829fb7f94c76cc11

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2898bd6c73e7d0965ed708c636891a7878e5d6c12848887c09781f48d9336b12",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2017-12-25T12:25:16Z",
    "title_canon_sha256": "cb454427af6f55d7763a869b53c9d6d793086dd9b93ecf9be74be85f021df7a5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1801.01454",
    "kind": "arxiv",
    "version": 1
  }
}