Pith Number

pith:HMP7D5VZ

pith:2015:HMP7D5VZ76DDFY5IO7BDZAJSNT

not attested not anchored not stored refs pending

Experimental Observation of Large Chern numbers in Photonic Crystals

John Joannopoulos, Ling Lu, Marin Soljacic, Qinghui Yan, Scott A. Skirlo, Yuichi Igarashi

arxiv:1504.04399 v2 · 2015-04-16 · physics.optics · cond-mat.mes-hall

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HMP7D5VZ76DDFY5IO7BDZAJSNT}

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	2026-05-18T01:23:58.422323Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3b1ff1f6b9ff8632e3a877c23c81326cf8e437f06925ca1ca66fd4d055b1e528

Aliases

arxiv: 1504.04399 · arxiv_version: 1504.04399v2 · doi: 10.48550/arxiv.1504.04399 · pith_short_12: HMP7D5VZ76DD · pith_short_16: HMP7D5VZ76DDFY5I · pith_short_8: HMP7D5VZ

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/HMP7D5VZ76DDFY5IO7BDZAJSNT \
  | 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: 3b1ff1f6b9ff8632e3a877c23c81326cf8e437f06925ca1ca66fd4d055b1e528

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cb3b2a62132aa26d5b24a10de7c4e4a560fc1b0cc50d19b971c5073528539a95",
    "cross_cats_sorted": [
      "cond-mat.mes-hall"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2015-04-16T22:06:24Z",
    "title_canon_sha256": "b90ccbd94bfde7993a54ce931cd8c01a95daa063fc0369d83f0c161b731a0ebd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.04399",
    "kind": "arxiv",
    "version": 2
  }
}