Pith Number

pith:7MGH7YES

pith:2017:7MGH7YESNNMYDBSWIFOB4HAEJW

not attested not anchored not stored refs pending

GIER: A Danish computer from 1961 with a role in the modern revolution of astronomy

Erik H{\o}g

arxiv:1704.05828 v1 · 2017-04-19 · astro-ph.IM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7MGH7YESNNMYDBSWIFOB4HAEJW}

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	2026-05-18T00:13:32.731951Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fb0c7fe0926b59818656415c1e1c044d88278d2965062d8217fc7a6a45ab3d6c

Aliases

arxiv: 1704.05828 · arxiv_version: 1704.05828v1 · doi: 10.48550/arxiv.1704.05828 · pith_short_12: 7MGH7YESNNMY · pith_short_16: 7MGH7YESNNMYDBSW · pith_short_8: 7MGH7YES

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/7MGH7YESNNMYDBSWIFOB4HAEJW \
  | 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: fb0c7fe0926b59818656415c1e1c044d88278d2965062d8217fc7a6a45ab3d6c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "04194a900b879b8de017cab38b0d1731b6afd7a502fd466eb88ad9cfb11133e6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2017-04-19T17:15:15Z",
    "title_canon_sha256": "b98900ae83059d30d946081fb585dbb2f84d9e3d220c85c8797fc75b5520d2e2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1704.05828",
    "kind": "arxiv",
    "version": 1
  }
}