Pith Number

pith:YRO7FI7D

pith:2009:YRO7FI7DHMLZSSA7ODIVDFL6PB

not attested not anchored not stored refs pending

Is Feasibility in Physics Limited by Fantasy Alone?

Cristian S. Calude, Karl Svozil

arxiv:0910.0457 v2 · 2009-10-02 · physics.hist-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{YRO7FI7DHMLZSSA7ODIVDFL6PB}

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	2026-05-18T03:39:03.821163Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c45df2a3e33b1799481f70d151957e78577477268d9788171e128222fcabca74

Aliases

arxiv: 0910.0457 · arxiv_version: 0910.0457v2 · doi: 10.48550/arxiv.0910.0457 · pith_short_12: YRO7FI7DHMLZ · pith_short_16: YRO7FI7DHMLZSSA7 · pith_short_8: YRO7FI7D

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/YRO7FI7DHMLZSSA7ODIVDFL6PB \
  | 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: c45df2a3e33b1799481f70d151957e78577477268d9788171e128222fcabca74

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "412879963150b351121484b4c301fc1151afe8de162b92eaed78f9a620177e49",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.hist-ph",
    "submitted_at": "2009-10-02T18:22:40Z",
    "title_canon_sha256": "b7a62bb0410964ceb85a4798f1c487c36cb40717f454a800170e5f7b098883f5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0910.0457",
    "kind": "arxiv",
    "version": 2
  }
}