Pith Number

pith:5WJ5F7JQ

pith:2019:5WJ5F7JQHUSZOMXKQV4AX2JRMD

not attested not anchored not stored refs pending

Men will stretch out their eyes: Or, What happened to Christopher Wren's inaugural

Robert I McLachlan

arxiv:1909.02167 v1 · 2019-09-05 · physics.hist-ph · astro-ph.EP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{5WJ5F7JQHUSZOMXKQV4AX2JRMD}

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	2026-07-05T00:02:31.515990Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ed93d2fd303d259732ea85780be93160e71a09777016b40236acf46f5170cf42

Aliases

arxiv: 1909.02167 · arxiv_version: 1909.02167v1 · doi: 10.48550/arxiv.1909.02167 · pith_short_12: 5WJ5F7JQHUSZ · pith_short_16: 5WJ5F7JQHUSZOMXK · pith_short_8: 5WJ5F7JQ

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/5WJ5F7JQHUSZOMXKQV4AX2JRMD \
  | 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: ed93d2fd303d259732ea85780be93160e71a09777016b40236acf46f5170cf42

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "906a4c15ff579264874c5aecbf6d3874dfa5c350a41e795034ca7a0d15971050",
    "cross_cats_sorted": [
      "astro-ph.EP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.hist-ph",
    "submitted_at": "2019-09-05T00:30:51Z",
    "title_canon_sha256": "25cb305d442f75e80d2adc82d85204271bea1d4c0fa23c741cdc644725064917"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1909.02167",
    "kind": "arxiv",
    "version": 1
  }
}