Pith Number

pith:BZ4DFNDY

pith:2017:BZ4DFNDY7Q54GMHEHRRJDUTIR2

not attested not anchored not stored refs pending

Restricted sums of four squares

Zhi-Wei Sun

arxiv:1701.05868 v10 · 2017-01-20 · math.NT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{BZ4DFNDY7Q54GMHEHRRJDUTIR2}

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	2026-07-05T00:11:14.327044Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0e7832b478fc3bc330e43c6291d2688e968b26e16e8b80ec76f00f1405262ae8

Aliases

arxiv: 1701.05868 · arxiv_version: 1701.05868v10 · doi: 10.48550/arxiv.1701.05868 · pith_short_12: BZ4DFNDY7Q54 · pith_short_16: BZ4DFNDY7Q54GMHE · pith_short_8: BZ4DFNDY

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/BZ4DFNDY7Q54GMHEHRRJDUTIR2 \
  | 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: 0e7832b478fc3bc330e43c6291d2688e968b26e16e8b80ec76f00f1405262ae8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "930191cde30ba33b1ac4b4914d9e683e0657041f0fd50044037c7c12c1624ea6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NT",
    "submitted_at": "2017-01-20T17:34:21Z",
    "title_canon_sha256": "42f5995e91b1653dfec1be8f55bd38fdca9aebc5eb59277ee339f6abb628d847"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1701.05868",
    "kind": "arxiv",
    "version": 10
  }
}