Pith Number

pith:HB4KSEID

pith:2015:HB4KSEIDMJ4KFLMRCFTCIGNXOJ

not attested not anchored not stored refs pending

The mass of the very massive binary WR21a

A. de Koter, A. Moffat, F. Tramper, H. Sana, L. Kaper, L. Mahy, N.E. Fitzsimons

arxiv:1510.03609 v1 · 2015-10-13 · astro-ph.SR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HB4KSEIDMJ4KFLMRCFTCIGNXOJ}

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	2026-05-18T01:26:41.008215Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3878a911036278a2ad9111662419b77259145f6294521d50c6bc5e7f49c1a3b0

Aliases

arxiv: 1510.03609 · arxiv_version: 1510.03609v1 · doi: 10.48550/arxiv.1510.03609 · pith_short_12: HB4KSEIDMJ4K · pith_short_16: HB4KSEIDMJ4KFLMR · pith_short_8: HB4KSEID

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/HB4KSEIDMJ4KFLMRCFTCIGNXOJ \
  | 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: 3878a911036278a2ad9111662419b77259145f6294521d50c6bc5e7f49c1a3b0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "86005869c74e0c1f7cfb709318d75fcaa7566a135ac49051ba0acc32a6b02867",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2015-10-13T09:59:19Z",
    "title_canon_sha256": "7dc858bd4388ba1d41166ff7a5240d0adafc14e51173223abd445463852d018a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1510.03609",
    "kind": "arxiv",
    "version": 1
  }
}