Pith Number

pith:7M5Q42FE

pith:2009:7M5Q42FEXTUKYQ54NZD5RJZ377

not attested not anchored not stored refs pending

Design Arbitrary Shaped 2D Acoustic Cloak without Singularity

Gengkai Hu, Jin Hu, Xiaoming Zhou

arxiv:0907.2282 v1 · 2009-07-14 · physics.class-ph · 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{7M5Q42FEXTUKYQ54NZD5RJZ377}

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	2026-05-18T04:21:00.771907Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fb3b0e68a4bce8ac43bc6e47d8a73bffc3f9655d09c947b797f78d0a0fc67f66

Aliases

arxiv: 0907.2282 · arxiv_version: 0907.2282v1 · doi: 10.48550/arxiv.0907.2282 · pith_short_12: 7M5Q42FEXTUK · pith_short_16: 7M5Q42FEXTUKYQ54 · pith_short_8: 7M5Q42FE

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/7M5Q42FEXTUKYQ54NZD5RJZ377 \
  | 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: fb3b0e68a4bce8ac43bc6e47d8a73bffc3f9655d09c947b797f78d0a0fc67f66

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2bf10800225799aac4f3767494f138285a88a23b0f6e008ba5cd7ae954568a85",
    "cross_cats_sorted": [
      "physics.optics"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.class-ph",
    "submitted_at": "2009-07-14T03:37:22Z",
    "title_canon_sha256": "a7c99f17bdae4625c6b726d31d2e956a548dd8ae67ee9a00839dd3f687d3e794"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.2282",
    "kind": "arxiv",
    "version": 1
  }
}