Pith Number

pith:RFJHWI7A

pith:2020:RFJHWI7AXJV4VFJMIQKPO2IZ5G

not attested not anchored not stored refs pending

Teaching an Old Ball New Tricks: Another Look at Energetics, Motion Detectors and a Bouncing Rubber Ball

David Marasco

arxiv:2009.12713 v1 · 2020-09-27 · physics.ed-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{RFJHWI7AXJV4VFJMIQKPO2IZ5G}

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	2026-07-05T01:38:22.654143Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

89527b23e0ba6bca952c4414f76919e9ae56f08e667c5f4b6114390759725f78

Aliases

arxiv: 2009.12713 · arxiv_version: 2009.12713v1 · doi: 10.48550/arxiv.2009.12713 · pith_short_12: RFJHWI7AXJV4 · pith_short_16: RFJHWI7AXJV4VFJM · pith_short_8: RFJHWI7A

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/RFJHWI7AXJV4VFJMIQKPO2IZ5G \
  | 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: 89527b23e0ba6bca952c4414f76919e9ae56f08e667c5f4b6114390759725f78

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6b9c34379c5a62aa54eb263cd97e7e412f3ad942dde77914e14683e199e63546",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.ed-ph",
    "submitted_at": "2020-09-27T00:18:19Z",
    "title_canon_sha256": "cc59b31d84c4939bc90606a64f7344cd5edd37ac49ebe076e446fa20b3a6d80e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2009.12713",
    "kind": "arxiv",
    "version": 1
  }
}