Pith Number

pith:YW55V2C3

pith:2012:YW55V2C3E7VUFQ7OOLNAMSBAQI

not attested not anchored not stored refs pending

Synchronous phase-demodulation of concentric-rings Placido mires in corneal topography and wavefront aberrometry (theoretical considerations)

Manuel Servin

arxiv:1204.1950 v2 · 2012-04-09 · physics.optics

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{YW55V2C3E7VUFQ7OOLNAMSBAQI}

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	2026-05-18T03:57:40.141433Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c5bbdae85b27eb42c3ee72da06482082266953a4b2db69d64fff193922785ece

Aliases

arxiv: 1204.1950 · arxiv_version: 1204.1950v2 · doi: 10.48550/arxiv.1204.1950 · pith_short_12: YW55V2C3E7VU · pith_short_16: YW55V2C3E7VUFQ7O · pith_short_8: YW55V2C3

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/YW55V2C3E7VUFQ7OOLNAMSBAQI \
  | 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: c5bbdae85b27eb42c3ee72da06482082266953a4b2db69d64fff193922785ece

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "540e04e6a22c2e355c43d61e7035cb493c0910a2fd66e91b2fff5ff04302b494",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2012-04-09T18:47:14Z",
    "title_canon_sha256": "708e5531deac6b12f4086efa5e04fcd28e957db4104c80149b67696297cbd95d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1204.1950",
    "kind": "arxiv",
    "version": 2
  }
}