Pith Number

pith:75INZM4V

pith:2019:75INZM4VHE2JAOHW5AFYFGAIJN

not attested not anchored not stored refs pending

Center of circle after perspective transformation

Albert Chern, Marc Alexa, Xi Wang

arxiv:1902.04541 v1 · 2019-02-12 · 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{75INZM4VHE2JAOHW5AFYFGAIJN}

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	2026-05-17T23:54:12.019230Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ff50dcb39539349038f6e80b8298084b455c2870ca3a53a40f7c36cdfa713e6e

Aliases

arxiv: 1902.04541 · arxiv_version: 1902.04541v1 · doi: 10.48550/arxiv.1902.04541 · pith_short_12: 75INZM4VHE2J · pith_short_16: 75INZM4VHE2JAOHW · pith_short_8: 75INZM4V

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/75INZM4VHE2JAOHW5AFYFGAIJN \
  | 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: ff50dcb39539349038f6e80b8298084b455c2870ca3a53a40f7c36cdfa713e6e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "81d7d4284ac7262ce716e86565e7da820d5bf6736773a9c979737f89be816042",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2019-02-12T18:38:04Z",
    "title_canon_sha256": "eb77f3b4b4189401898fae2ed3fd3093263d3a839fd776e20c0b57ddc6d3b06d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.04541",
    "kind": "arxiv",
    "version": 1
  }
}