Pith Number

pith:M37HD4U3

pith:2021:M37HD4U3YL5BAWDOHZKGRUZWXU

not attested not anchored not stored refs pending

Broadband acoustic invisibility and illusions

Andrew Curtis, Christoph B\"arlocher, Dirk-Jan van Manen, Johan O.A. Robertsson, Marc Serra-Garcia, Nele B\"orsing, Theodor S. Becker, Thomas Haag, Xun Li

arxiv:2105.07709 v2 · 2021-05-17 · physics.app-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{M37HD4U3YL5BAWDOHZKGRUZWXU}

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	2026-07-05T02:42:05.295616Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

66fe71f29bc2fa10586e3e5468d336bd1766b23067a9352663937b887e92bdaa

Aliases

arxiv: 2105.07709 · arxiv_version: 2105.07709v2 · doi: 10.48550/arxiv.2105.07709 · pith_short_12: M37HD4U3YL5B · pith_short_16: M37HD4U3YL5BAWDO · pith_short_8: M37HD4U3

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/M37HD4U3YL5BAWDOHZKGRUZWXU \
  | 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: 66fe71f29bc2fa10586e3e5468d336bd1766b23067a9352663937b887e92bdaa

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "940fa18c974271c0c812857bfe39b603aa2f544210e10cc1e387346228b882dd",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
    "primary_cat": "physics.app-ph",
    "submitted_at": "2021-05-17T09:55:08Z",
    "title_canon_sha256": "c57b8821dbcda0e8596a7ba7fad979638c77ec6e4498541d1e8a00492994c662"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2105.07709",
    "kind": "arxiv",
    "version": 2
  }
}