Pith Number

pith:R2J4YT5O

pith:2009:R2J4YT5OOUMZA2WASTNLE73CUC

not attested not anchored not stored refs pending

Einstein's unpublished opening lecture for his course on relativity theory in Argentina, 1925

Alejandro Gangui, Eduardo L. Ortiz

arxiv:0903.2064 v1 · 2009-03-11 · physics.hist-ph · astro-ph.CO · gr-qc · physics.soc-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{R2J4YT5OOUMZA2WASTNLE73CUC}

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	2026-05-18T00:05:08.330161Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8e93cc4fae7519906ac094dab27f62a083f284f04009aef102a4f7a188d57b29

Aliases

arxiv: 0903.2064 · arxiv_version: 0903.2064v1 · doi: 10.48550/arxiv.0903.2064 · pith_short_12: R2J4YT5OOUMZ · pith_short_16: R2J4YT5OOUMZA2WA · pith_short_8: R2J4YT5O

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/R2J4YT5OOUMZA2WASTNLE73CUC \
  | 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: 8e93cc4fae7519906ac094dab27f62a083f284f04009aef102a4f7a188d57b29

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e0a8abbd2672231afd98010e93fb6114b9530dc730aaa3d330af7fc716bba00f",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "gr-qc",
      "physics.soc-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.hist-ph",
    "submitted_at": "2009-03-11T21:35:25Z",
    "title_canon_sha256": "9310d056babaa3012f1d11c1946e1590b901edf6bd76d03c8d29fdb4f8547870"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.2064",
    "kind": "arxiv",
    "version": 1
  }
}