Pith Number

pith:NBJ6ZIIQ

pith:2009:NBJ6ZIIQGQ2URMDAGVP3LO2EL4

not attested not anchored not stored refs pending

CSPOB-Continuous Spectrophotometry of Black Holes

A. Nandi, A. R. Rao, D. Bhoumik, D. Debnath, R. Sarkar, S.K. Chakrabarti, V. Yadav

arxiv:0903.1507 v1 · 2009-03-09 · astro-ph.IM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NBJ6ZIIQGQ2URMDAGVP3LO2EL4}

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	2026-05-18T04:33:40.005344Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6853eca110343548b060355fb5bb445f140654ac6d8c484b8082254710e2eca6

Aliases

arxiv: 0903.1507 · arxiv_version: 0903.1507v1 · doi: 10.48550/arxiv.0903.1507 · pith_short_12: NBJ6ZIIQGQ2U · pith_short_16: NBJ6ZIIQGQ2URMDA · pith_short_8: NBJ6ZIIQ

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/NBJ6ZIIQGQ2URMDAGVP3LO2EL4 \
  | 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: 6853eca110343548b060355fb5bb445f140654ac6d8c484b8082254710e2eca6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "503dcc307c2cc481775bd13a924c4f5672172c155800bc549ba69837d3f61e28",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2009-03-09T10:17:08Z",
    "title_canon_sha256": "9953e4b55fb65d17472f50f4fa8b98d3d4fb8c85ce7e510690f10ac8dc0b2aa6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.1507",
    "kind": "arxiv",
    "version": 1
  }
}