Pith Number

pith:HU5PDTIO

pith:2012:HU5PDTIOGPSV4LDXZYVGQNIH3Y

not attested not anchored not stored refs pending

The Ring Nebula Around the Blue Supergiant SBW1: Pre-Explosion Snapshot of a SN 1987A Twin

Adam Ginsburg, Alexei V. Filippenko, John Bally, Nathan Smith, W. David Arnett

arxiv:1211.4612 v2 · 2012-11-19 · astro-ph.SR · astro-ph.HE

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	2026-05-18T01:53:02.724685Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3d3af1cd0e33e55e2c77ce2a683507de11f51c4307bf44dbc8724e6aa19ec95f

Aliases

arxiv: 1211.4612 · arxiv_version: 1211.4612v2 · doi: 10.48550/arxiv.1211.4612 · pith_short_12: HU5PDTIOGPSV · pith_short_16: HU5PDTIOGPSV4LDX · pith_short_8: HU5PDTIO

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/HU5PDTIOGPSV4LDXZYVGQNIH3Y \
  | 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: 3d3af1cd0e33e55e2c77ce2a683507de11f51c4307bf44dbc8724e6aa19ec95f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ad46fdd37bb77314578b10490dad67c5913f837952dd50e076e83b4ac139ffbf",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2012-11-19T22:29:07Z",
    "title_canon_sha256": "569b2cf7f6ff5634889f7733c2e8b17b138b979ce2367934b4794e96b13e249e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1211.4612",
    "kind": "arxiv",
    "version": 2
  }
}