Pith Number

pith:WUP4JCU6

pith:2021:WUP4JCU63CZ2HVR637RGHDVK4M

not attested not anchored not stored refs pending

Re-estimating the Spin Parameter of the Black Hole in Cygnus X-1

Arash Bahramian, James C.A. Miller-Jones, James F. Steiner, Jerome A. Orosz, Lijun Gou, Xueshan Zhao, Xueying Zheng, Yanting Dong, Ye Feng

arxiv:2102.09093 v1 · 2021-02-18 · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{WUP4JCU63CZ2HVR637RGHDVK4M}

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.

Cited by

1 paper in Pith

Black hole supercolliders

Receipt and verification

First computed	2026-07-05T02:17:51.100560Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b51fc48a9ed8b3a3d63edfe2638eaae311cef38f66e7a245c6a90acbb58e5dc8

Aliases

arxiv: 2102.09093 · arxiv_version: 2102.09093v1 · doi: 10.48550/arxiv.2102.09093 · pith_short_12: WUP4JCU63CZ2 · pith_short_16: WUP4JCU63CZ2HVR6 · pith_short_8: WUP4JCU6

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/WUP4JCU63CZ2HVR637RGHDVK4M \
  | 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: b51fc48a9ed8b3a3d63edfe2638eaae311cef38f66e7a245c6a90acbb58e5dc8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "40b369b7937f2a0ccbe6290e0bbf2c66f4ac84278268da03a454087d899c1c43",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2021-02-18T01:00:16Z",
    "title_canon_sha256": "5ec3f0eb0d5bc17c04f61d7699777e97ff46a26c3ff965f7c5dab587ccf9d1de"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2102.09093",
    "kind": "arxiv",
    "version": 1
  }
}