Pith Number

pith:4LIW73IY

pith:2017:4LIW73IYIVP6EQCBXPCR4553XT

not attested not anchored not stored refs pending

Using Machine-Learning to Optimize phase contrast in a Low-Cost Cellphone Microscope

Benedict Diederich, Harald Schadwinkel, Rainer Heintzmann, Rolf Wartmann

arxiv:1712.06891 v1 · 2017-12-19 · 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{4LIW73IYIVP6EQCBXPCR4553XT}

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	2026-05-18T00:11:50.140141Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e2d16fed18455fe24041bbc51e77bbbce8563fe4402b7d1f947830df9c28e06f

Aliases

arxiv: 1712.06891 · arxiv_version: 1712.06891v1 · doi: 10.48550/arxiv.1712.06891 · pith_short_12: 4LIW73IYIVP6 · pith_short_16: 4LIW73IYIVP6EQCB · pith_short_8: 4LIW73IY

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/4LIW73IYIVP6EQCBXPCR4553XT \
  | 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: e2d16fed18455fe24041bbc51e77bbbce8563fe4402b7d1f947830df9c28e06f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cbc034a1e1981e331f9029c14a45906a719d7e553f4111d1738d4e287cf31c7b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2017-12-19T12:07:41Z",
    "title_canon_sha256": "91489f27d0d3c2b28d840b24836b8dd503083235ea46fa06b31a2d7f34f2b982"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1712.06891",
    "kind": "arxiv",
    "version": 1
  }
}