Pith Number

pith:4TDSOP56

pith:2018:4TDSOP56ANXGTSAHCWN3KVBVNX

not attested not anchored not stored refs pending

Sunspot Drawings by Japanese Official Astronomers in 1749-1750

Harufumi Tamazawa, Haruhisa Iijima, Hideyuki Hotta, Hisashi Hayakawa, Kazunari Shibata, Kiyomi Iwahashi, Masashi Fujiyama, Shinsuke Imada, Shin Toriumi, Toshiki Kawai

arxiv:1804.08614 v1 · 2018-04-23 · physics.hist-ph · astro-ph.SR · physics.space-ph

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

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	2026-05-18T00:09:14.486643Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e4c7273fbe036e69c807159bb554356dd8686cc924f505c023fe3e42d3ecf79a

Aliases

arxiv: 1804.08614 · arxiv_version: 1804.08614v1 · doi: 10.48550/arxiv.1804.08614 · pith_short_12: 4TDSOP56ANXG · pith_short_16: 4TDSOP56ANXGTSAH · pith_short_8: 4TDSOP56

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/4TDSOP56ANXGTSAHCWN3KVBVNX \
  | 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: e4c7273fbe036e69c807159bb554356dd8686cc924f505c023fe3e42d3ecf79a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4153f5b46a6316793cc89994dcc6676acccb542d34b52fb8d1b8db6ec6edcdcb",
    "cross_cats_sorted": [
      "astro-ph.SR",
      "physics.space-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.hist-ph",
    "submitted_at": "2018-04-23T09:30:50Z",
    "title_canon_sha256": "9a0c7352f26e867c75c1b4f5da798a5839445e84987116f60021555c162d7438"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.08614",
    "kind": "arxiv",
    "version": 1
  }
}