Pith Number

pith:ZX6RYQ7B

pith:2009:ZX6RYQ7BKWWLC6UZKDAY75TTDC

not attested not anchored not stored refs pending

The spiral structure of our Milky Way Galaxy

J. L. Han (NAOC), L. G. Hou (NAOC), W. B. Shi (NAOC)

arxiv:0903.0721 v2 · 2009-03-04 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ZX6RYQ7BKWWLC6UZKDAY75TTDC}

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	2026-05-18T02:14:37.397153Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cdfd1c43e155acb17a9950c18ff67318b4b99e2a71765d8e4619e7325e118ab8

Aliases

arxiv: 0903.0721 · arxiv_version: 0903.0721v2 · doi: 10.48550/arxiv.0903.0721 · pith_short_12: ZX6RYQ7BKWWL · pith_short_16: ZX6RYQ7BKWWLC6UZ · pith_short_8: ZX6RYQ7B

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/ZX6RYQ7BKWWLC6UZKDAY75TTDC \
  | 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: cdfd1c43e155acb17a9950c18ff67318b4b99e2a71765d8e4619e7325e118ab8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2cf9b96d91505e6113d7b65153427c01f96149ab9f420731acb67484d50aa95b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-03-04T10:37:21Z",
    "title_canon_sha256": "2c9bc85eace96d9d70073300ef9b9e60627027ccf24bf36ff926fa5d8fe6d52f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.0721",
    "kind": "arxiv",
    "version": 2
  }
}