Pith Number

pith:7A4MWIQX

pith:2018:7A4MWIQXUSWN4YBPLXUFFGWL4N

not attested not anchored not stored refs pending

The interacting late-type host galaxy of the radio-loud narrow-line Seyfert 1 IRAS 20181-2244

A. Caccianiga, A. L\"ahteenm\"aki, E. Congiu, E. J\"arvel\"a, F. Di Mille, G. La Mura, J. Kotilainen, M. Berton, M. Frezzato, P. Coppi, P. Rafanelli, R. Antonucci, S. Ant\'on, S. Chen, S. Ciroi, S. Komossa, S. Mathur, V. Cracco

arxiv:1807.08953 v2 · 2018-07-24 · astro-ph.GA

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	2026-05-17T23:55:55.925409Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f838cb2217a4acde602f5de8529acbe36bf8f5103b87cd31091d0cc1c78b1525

Aliases

arxiv: 1807.08953 · arxiv_version: 1807.08953v2 · doi: 10.48550/arxiv.1807.08953 · pith_short_12: 7A4MWIQXUSWN · pith_short_16: 7A4MWIQXUSWN4YBP · pith_short_8: 7A4MWIQX

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/7A4MWIQXUSWN4YBPLXUFFGWL4N \
  | 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: f838cb2217a4acde602f5de8529acbe36bf8f5103b87cd31091d0cc1c78b1525

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8250bc65f928f3b32ba1820af2a1096b490ff80b0c9030e707efd1978f7374aa",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2018-07-24T08:26:36Z",
    "title_canon_sha256": "91a1bcf185051aeaf5465151129333720c83bbc3f06478d90f61e62c436771e4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1807.08953",
    "kind": "arxiv",
    "version": 2
  }
}